U.S. PATENT AND TRADEMARK OFFICE
Information Products Division
[Manual of Classification, Class Listing] [Manual of Classification, Class 379] [Classification Definitions, Class Listing] [USPTO Home Page]

U.S. Patent Classification System - Classification Definitions
as of June 30, 2000

[Explanation of Data]

Patents classified in a subclass may be accessed by either clicking on the subclass number
preceding each subclass definition or on the " [Patents] " icon, below.
( please note that patents for some subclasses may not be available )

For classification search strategies, please refer to the Classification Index Explanation of Data web page.

(definitions have been obtained from the Patents ASSIST CD-ROM which is produced by the U.S. Patent and Trademark Office Electronic Products Branch)


Class 379

TELEPHONIC COMMUNICATIONS


Class Definition:
STATEMENT OF THE CLASS SUBJECT MATTER:
(A) Systems, processes and instruments for the two-way electrical transmission of intelligible audio information having arbitrary content over a link including an electrical conductor, between spaced apart locations, so as to enable
conversation therebetween, and intended for the private use of a listener or a group of listeners. The term "intelligible" used above is intended to include the capability for transmission of speech or the like (e.g., music), rather than restriction to a specified audible signal, such as a bell or buzzer.
(B) Switching, signalling or signal transmission peculiar to, or specified as for a telephone or a telephone system, except for multiplex communications as indicated in Lines With Other Classes and Within This Class, below.
(C) Subsystems, elements and adjuncts peculiar to such transmission and not provided for elsewhere.

LINES WITH OTHER CLASSES AND WITHIN THIS CLASS
(1) Bi-directional audio communication is normally a duplex arrangement, and simultaneous audio transmission of a single conversation is in this class (379) and excluded from Class 370, Multiplex Communications, in the absence of some other particular multiplexing technique.
(2) With exception of voice signal duplexing as pointed out in (1) above, subject matter including multiplexing, particularly involving plural conversations, regardless of recitation of telephone limitations, is excluded from this class (379) and is classified elsewhere.
(3) Audible signalling for call alerting, or producing a signal having other specific content, such as bells, buzzers, etc., are classified elsewhere, even if nominally characterized as used in a telephone.
(4) Electromagnetic switches for automatic telephone switching type, per se, are classified elsewhere.
(5) Electrical connectors merely nominally characterized as for telephones, in the absence of additional telephone structure are classified elsewhere.
(6) Named communications or telecommunications networks absent recitation of telephone or voice limitation are not classifiable herein.
(7) The following terms when used in a communication system or instrument are considered to specify telephone equipment except as specified in (2) above with respect to multiplexing or in class or subclass search notes: dial tone - off-hook, handset - on-hook, hookswitch - ringback, howler - sidetone, intercom - switchboard, key set - switchhook, telephone line (used with switching system), tip and ring (leads)
RELATIONSHIP TO OTHER SPEECH COMMUNICATIONS CLASSES
This class (379) requires the capability for two-way spoken communications, or specified used of a telephone line, and
subsystems peculiar to either of the above.
A mechanical telephone is classified elsewhere. See References to Other Classes, below.
All speech or telephone equipment which conceals message content despite interception or unauthorized reception of a telephone signal is classified elsewhere. See References to Other Classes, below.
Electrical speech processing system and apparatus, including for example, such systems as, megaphones, public address systems and hearing aids; and transducers such as microphones, earphones or loudspeakers and also includes either of a telephone microphone or receiver are classified elsewhere. See References to Other Classes, below.
Audio signal telecommunications by a modulated carrier wave not having telephone land line structure or limitations is classified elsewhere. See References to Other Classes, below.

SEE OR SEARCH THIS CLASS, SUBCLASS:
1 through 36, for observation, measuring, or testing.
37 through 51, for coin-free paystation, emergency, or alarm equipment.
52 for handicapped user.
55.1 through 56.3, for wireless or carrier link.
67.1 through 88.28, for voice signal storage.
90 through 110, for composite system or terminal.
111 through 142, for usage measurement or display.
143 through 155, for paystations.
156 through 187, for key, private or party systems.
188 through 200, for call or terminal limiting.
201 through 218, for special services.
219 through 332, for switch telephone network.
333 through 349, for network component systems.
350 through 386, for supervisory or control signalling.
387 through 418, for substation or line circuitry or component.
419 through 456, for terminal structure or accessory.
457 for miscellaneous.

REFERENCES TO OTHER CLASSES

SEE OR SEARCH CLASS:
181, Acoustics, includes a mechanical telephone.
335, Electricity: Magnetically Operated Switches, Magnets, and Electromagnets, for electromagnetic switches for automatic telephone switching type, per se.
340, Communications: Electrical, for audible signalling for call alerting, or producing a signal having other specific content, such as bells, buzzers, etc., even if nominally characterized as used in a telephone.
370, Multiplex Communications, for subject matter including multiplexing, particularly involving plural conversations, regardless of recitation of telephone limitations; 276 for duplex transmission.
380, Cryptography, includes all speech or telephone equipment which conceals message content despite interception or unauthorized reception of a telephone signal.
381, Electrical Audio Signal Processing and Systems is a generic electrical speech processing system and apparatus class and includes, for example, such systems as, megaphones, public address systems and hearing aids; and transducers such as microphones, earphones or loudspeakers and also includes either of a telephone microphone or receiver, but not their combination as in a handset.
439, Electrical Connectors, for electrical connectors merely nominally characterized as for telephones, in the absence of additional telephone structure.
455, includes audio signal telecommunications by a modulated carrier wave not having telephone land line structure or limitations.

GLOSSARY:
BI-DIRECTIONAL
Capable of use, particularly in transmitting information in two opposite directions. Additionally, when used to describe an audio transducer, capable of conversion of sound both to and from electrical signal variations.
CALL ADDRESS SIGNAL
An electrical representation of a called terminal designation (i.e., telephone number) which controls switching apparatus to establish a connection from a calling terminal.
DIALING
Generating a call address signal. Although a dial is a rotary pulse generating switch, the term dialing is sometimes used generically as in the terms "tone dialing" and "resistance dialing".
SUBSCRIBER
Telephone user or service location.
SUBSCRIBER
Telephone circuitry or instruments at subscriber location.
TELEPHONE
An instrument, known as a user terminal set, containing an audio reproducer, and a speech-to-electricity transducer. An obsolete usage of this term (telephone) is broad enough to include a microphone or reproducer; however, a microphone or reproducer, per se, is classified in Class 381.


SUBCLASSES


Subclass: 1 [Patents]

DIAGNOSTIC TESTING, MALFUNCTION INDICATION, OR ELECTRICAL CONDITION MEASUREMENT:
This subclass is indented under the class definition. Subject matter for either (a) evaluating or monitoring the condition of a telephone system or a component thereof in order to determine the presence of a faulty or nonstandard condition or (b) quantitatively determining an electrical parameter of a telephone system or component thereof.
(1) Note. Testing to determine which one of several normal status conditions exist (e.g., busy-idle, off-hook) is not classified in this or indented subclasses.
(2) Note. The testing or measurement must be specifically claimed as in or for a telephone system or a component thereof for classification in this or indented communication or telecommunication system is not sufficient for classification in these subclasses.

SEE OR SEARCH CLASS:
324, Electricity: Measuring and Testing, appropriate subclasses for an electrical measurement or test not limited to a telephone instrument or system.
340, Communications: Electrical, 635 for fault indication
of an electrical apparatus, and an electrical parameter, respectively.

Subclass: 2 [Patents]

Including fault responsive disconnection of tested component:
This subclass is indented under subclass 1. Subject matter including automatic removal from operation of a component evaluated as faulty.

Subclass: 3 [Patents]

Of hybrid, or echo suppressor or canceller:
This subclass is indented under subclass 1. Subject matter for testing a device for coupling a two-wire to four-wire interconnecting circuit or for eliminating an echo effect in a telephone system.

SEE OR SEARCH THIS CLASS, SUBCLASS:
345 391 and 402+, for a hybrid in telephone equipment.
406 for an echo suppressor.

Subclass: 4 [Patents]

Of repeater:
This subclass is indented under subclass 1. Subject matter which tests a device which amplifies or transfers a signal between two telephone circuits, or circuit sections.

SEE OR SEARCH THIS CLASS, SUBCLASS:
338 for a telephone repeater.

SEE OR SEARCH CLASS:
370, Multiplex Communications, subclass 243 for fault detection of a multiplex repeater, and subclasses 246+ for testing of a standard operation of a multiplex repeater.
375, Pulse or Digital Communications, subclass 213 for testing of a pulse or digital repeater.

Subclass: 5 [Patents]

By loopback:
This subclass is indented under subclass 1. Subject matter including transmitting a known signal from a testing location over a communication path to a second remote location which retransmits the known signal back to the testing location for use in evaluating the transmission path or a device are the remote location.

SEE OR SEARCH CLASS:
370, Multiplex Communications, subclass 249 for loopback testing in a multiplex system.
714, Error Detection/Correction and Fault Detection/Recovery, subclass 716, for loopback testing of a communications circuit of general utility by a digital test signal.

Subclass: 6 [Patents]

By analysis of injected tone signal:
This subclass is indented under subclass 1. Subject matter which includes placing a signal into the system to be tested and comparing the parameters of the output signal from the system over a continuous range with the corresponding parameters of the signal input.
(1) Note. Such testing is often used in determination of degradation or crosstalk.

SEE OR SEARCH CLASS:
324, Electricity: Measuring and Testing, subclass 628 for measurement of interference between circuits.

Subclass: 7 [Patents]

For detection of eavesdropping device:
This subclass is indented under subclass 1. Subject matter to determine whether an undesired or surreptitious receiving device is connected to telephone equipment.

SEE OR SEARCH THIS CLASS, SUBCLASS:
35 for an eavesdropping device.

Subclass: 8 [Patents]

With blocking of normal usage:
This subclass is indented under subclass 1. Subject matter including prevention of normal use of a telephone system component being evaluated.

SEE OR SEARCH THIS CLASS, SUBCLASS:
381 for a make busy circuit, in general.

Subclass: 9 [Patents]

Of centralized switching system:
This subclass is indented under subclass 1. Subject matter for evaluating the operation of a system or component which selectively connects two of a plurality of telephone lines for communication therebetween.

SEE OR SEARCH THIS CLASS, SUBCLASS:
242 for a centralized telephone switching system.

Subclass: 10 [Patents]

By automatic testing sequence (e.g., programmable, scanning):
This subclass is indented under subclass 9. Subject matter which serially performs plural steps included in a central switching arrangement evaluation.

Subclass: 11 [Patents]

Routiner:
This subclass is indented under subclass 10. Subject matter wherein centralized switching equipment is tested by performing actual line selection.

Subclass: 12 [Patents]

With dedicated testing line or trunk:
This subclass is indented under subclass 9. Subject matter including a line or trunk used exclusively for measurement or diagnostic testing.

Subclass: 13 [Patents]

Of call timing or charging equipment:
This subclass is indented under subclass 9. Subject matter for evaluating equipment which measures call duration or cost.

SEE OR SEARCH THIS CLASS, SUBCLASS:
111 for a call timing and charging arrangement.

Subclass: 14 [Patents]

Of plural exchange network:
This subclass is indented under subclass 9. Subject matter wherein a plurality of switching offices facilities are tested.

SEE OR SEARCH THIS CLASS, SUBCLASS:
219 for a plural exchange telephone network.

Subclass: 15 [Patents]

Of automatic switching equipment:
This subclass is indented under subclass 9. Subject matter for testing switching equipment which performs a selective call connection in response to a call address signal.

SEE OR SEARCH THIS CLASS, SUBCLASS:
258 for automatic switching equipment.

Subclass: 16 [Patents]

Of switching path:
This subclass is indented under subclass 15. Subject matter which evaluates the route of a switching connection through telephone switching equipment.

SEE OR SEARCH THIS CLASS, SUBCLASS:
273 for alternate routing of a call connection.

Subclass: 17 [Patents]

Of switching selector:
This subclass is indented under subclass 15. Subject matter for testing a device which selects a branch of the switching path.

SEE OR SEARCH CLASS:
324, Electricity: Measuring and Testing, 415 for testing of an electromagnetic switch.

Subclass: 18 [Patents]

By use of call address signal:
This subclass is indented under subclass 15. Subject matter which generates a selective switching control signal specifying a called station address.

SEE OR SEARCH THIS CLASS, SUBCLASS:
352 for telephone call address signal generating, in general.

Subclass: 19 [Patents]

Rapid manual connecting structure for test equipment:
This subclass is indented under subclass 15. Subject matter designed or located for connection of a testing or measurement arrangement.

SEE OR SEARCH CLASS:
439, Electrical Connectors, appropriate subclasses for such connectors not limited to testing telephone switching devices.

Subclass: 20 [Patents]

Of switchboard element condition (e.g., lamp):
This subclass is indented under subclass 9. Subject matter for evaluating an element of an arrangement for manual line interconnection.
(1) Note. Such elements may include lamps or cords.

SEE OR SEARCH CLASS:
324, Electricity: Measuring and Testing, 403 for testing of a lamp, in general.

Subclass: 21 [Patents]

Using portable test set (e.g., handset type):
This subclass is indented under subclass 1. Subject matter in which a line test or measurement is performed with a device which is small and light enough to be easily carried by an individual.

Subclass: 22 [Patents]

Of trunk or long line:
This subclass is indented under subclass 1. Subject matter wherein a characteristic of an interexchange or in specified telephone conductor is evaluated.

SEE OR SEARCH THIS CLASS, SUBCLASS:
27 for testing of a subscriber line or loop.

Subclass: 23 [Patents]

Of line signalling:
This subclass is indented under subclass 22. Subject matter which evaluates the transmission or operation of a control signal on a telephone line.

Subclass: 24 [Patents]

Electrical parameter measurement (e.g., attenuation):
This subclass is indented under subclass 22. Subject matter including structure for providing a quantitative indication of an electrical characteristic of the line or trunk or the signal thereon.

SEE OR SEARCH CLASS:
324, Electricity: Measuring and Testing, 600 for impedance measurement of a nontelephone line.

Subclass: 25 [Patents]

Conductor identification or location:
This subclass is indented under subclass 22. Subject matter for determining the identity or position of a telephone line conductor.

Subclass: 26 [Patents]

Fault detection or location (e.g., continuity, leakage):
This subclass is indented under subclass 22. Subject matter to determine the presence or location of a conductor fault in a telephone line conductor.

Subclass: 27 [Patents]

Of subscriber loop or terminal:
This subclass is indented under subclass 1. Subject matter for evaluating, measuring, or monitoring a characteristic of a subscriber line or station.

SEE OR SEARCH CLASS:
73, Measuring and Testing, appropriate subclasses for physical testing, in general.
381, Electrical Audio Signal Processing Systems and Devices, 58 for evaluation of an audio device other than telephone equipment.

Subclass: 28 [Patents]

Of data transmission instrument:
This subclass is indented under subclass 27. Subject matter for testing of a digital signal data terminal connected to a telephone line.

SEE OR SEARCH THIS CLASS, SUBCLASS:
93.01 transmission of a digital message signal over a telephone line.

SEE OR SEARCH CLASS:
375, Pulse or Digital Communications, 224 for testing a digital transmission instrument not part of a telephone arrangement.

Subclass: 29 [Patents]

Terminal arrangement to enable remote testing (e.g., testing interface):
This subclass is indented under subclass 27. Subject matter which includes an arrangement to facilitate localization of faults in, or localized testing of, either a substation or a subscriber loop.
(1) Note. The testing may be performed either at the substation or remotely, e.g., from a central office.

Subclass: 30 [Patents]

Loop impedance (e.g., resistance, capacitance):
This subclass is indented under subclass 27. Subject matter for measuring the electrical impedance along and across a subscriber line or terminal.

SEE OR SEARCH CLASS:
324, Electricity: Measuring and Testing, 600 for electrical impedance measurement.

Subclass: 31 [Patents]

Of line signalling generator (e.g., dial, tone code generator):
This subclass is indented under subclass 27. Subject matter for testing or measuring a voice frequency signalling generator or an impulsing signal producing arrangement, in a terminal.

Subclass: 32 [Patents]

Indication of nonstandard condition of telephone equipment:
This subclass is indented under subclass 1. Subject matter for monitoring the condition of telephone equipment and providing a perceptible indication of a fault or other improper equipment condition.
(1) Note. Diagnostic testing of equipment responsive to a fault only during performance of the test is excluded from this subclass and classified in subclasses 2-30 above.

Subclass: 33 [Patents]

Alarm or emergency (e.g., cut line):
This subclass is indented under subclass 32. Subject matter where the indicated condition is of damage, or imminent hazard to, telephone equipment.

Subclass: 34 [Patents]

SERVICE MONITORING OR OBSERVATION:
This subclass is indented under the class definition. Subject matter for monitoring the response of a telephone operator, or the response time of telephone equipment.
(1) Note. The response time usually indicates time elapsed after the user service request.

SEE OR SEARCH THIS CLASS, SUBCLASS:
133 for determination of call traffic on, or usage of, telephone system equipment.

Subclass: 35 [Patents]

Listening-in or eavesdropping type:
This subclass is indented under subclass 34. Subject matter for making a telephone conversation audible to a person without the conversing parties being notified.

SEE OR SEARCH THIS CLASS, SUBCLASS:
85 for audio recording of a telephone conversation.

Subclass: 36 [Patents]

FREE CALLING FROM PAYSTATION:
This subclass is indented under the class definition. Subject matter including a terminal, normally requiring payment for usage, which has provision for limited usage without payment.
(1) Note. This subclass includes both emergency and nonemergency free calling from a paystation, for example "0", "800" and "911" calls.

SEE OR SEARCH THIS CLASS, SUBCLASS:
45 for emergency calling not including free calling from a paystation.
143 for a paystation.

Subclass: 37 [Patents]

EMERGENCY OR ALARM COMMUNICATIONS (E.G., WATCHMAN'S CIRCUIT):
This subclass is indented under the class definition. Subject matter for summoning response to a hazardous situation over a telephone line.
(1) Note. The term "hazardous situation" refers to a condition or occurrence posing imminent danger to life, health, or property.
(2) Note. The subject matter in this and it's indented subclasses included both systems solely for emergency use an details of adjunct to other systems to specifically provide for emergency situations. Further, an arrangement incidentally (e.g., an automatic dialer) be used for an emergency situation will be classified with such arrangement.

SEE OR SEARCH CLASS:
340, Communications: Electrical, 287 for a signal box alarm arrangement, particularly subclass 288 for alarm transmission over a power line.

Subclass: 38 [Patents]

Personal monitoring (e.g., for the ill or infirm):
This subclass is indented under subclass 37. Subject matter wherein the hazardous situation is a condition of, or occurrence related to the well-being of an individual.

SEE OR SEARCH THIS CLASS, SUBCLASS:
52 for a telephone instrument particularly designed for a handicapped user.

Subclass: 39 [Patents]

Responsive to sensed nonsystem condition:
This subclass is indented under subclass 37. Subject matter which responds automatically to a condition, external to the telephone system.

SEE OR SEARCH THIS CLASS, SUBCLASS:
106 for remote condition indication, other than an emergency or alarm condition, over a telephone line.

SEE OR SEARCH CLASS:
340, Communications: Electrical, 500 for a condition responsive alarm system not including telephone apparatus.

Subclass: 40 [Patents]

Automatic dialing:
This subclass is indented under subclass 39. Subject matter which generates a predetermined call address signal for establishing a connection to a given telephone station.

SEE OR SEARCH THIS CLASS, SUBCLASS:
51 for automatic dialing in transmission of a recorded audio alarm message.

Subclass: 41 [Patents]

Transmission of recorded audio message:
This subclass is indented under subclass 39. Subject matter which sends a previously stored sound message signal over a telephone line in response to an emergency condition.

SEE OR SEARCH THIS CLASS, SUBCLASS:
51 for transmission of recorded audio message in emergency or alarm communications that is not automatically condition responsive.

Subclass: 42 [Patents]

Plural conditions:
This subclass is indented under subclass 39. Subject matter wherein more than one emergency or alarm condition is detected (e.g., fire, intrusion, health hazard).

Subclass: 43 [Patents]

Fire:
This subclass is indented under subclass 39. Subject matter wherein the detected condition is flame, heat or smoke.

Subclass: 44 [Patents]

Intrusion:
This subclass is indented under subclass 39. Subject matter wherein the detected condition is the entry of a living being into a given space.

SEE OR SEARCH CLASS:
340, Communications: Electrical, 541 for an intrusion alarm not limited to telephone equipment.

Subclass: 45 [Patents]

Central office responsive to emergency call or alarm (e.g., "911", operator position display):
This subclass is indented under subclass 37. Subject matter wherein a central office has equipment to make a connection or provide a display for an emergency situation.

SEE OR SEARCH THIS CLASS, SUBCLASS:
36 for free calling from a paystation.

Subclass: 46 [Patents]

Called line or station condition responsive (e.g., recall if busy):
This subclass is indented under subclass 37. Subject matter where a condition of a called line or station controls further operation.

SEE OR SEARCH THIS CLASS, SUBCLASS:
33 for a telephone equipment alarm condition.
209 for this subject matter, in a nonalarm system.

Subclass: 47 [Patents]

Plural alarms over single line:
This subclass is indented under subclass 37. Subject matter wherein a plurality of alert signals are sent over one telephone line.

SEE OR SEARCH THIS CLASS, SUBCLASS:
42 for a condition responsive plural alarm signals.

Subclass: 48 [Patents]

Announcement or alarm received at terminal station (e.g., "butt-in", alarm):
This subclass is indented under subclass 37. Subject matter which enables a central station (a) to interrupt normal telephone communication to make an announcement to, or (b) to actuate an alarm at, a terminal station.

Subclass: 49 [Patents]

Central station with plural substations:
This subclass is indented under subclass 37. Subject matter having a single central alarm station connected to a plurality of terminal stations.

Subclass: 50 [Patents]

By pulse or digital signal:
This subclass is indented under subclass 37. Subject matter wherein the alarm signal is transmitted over a telephone line as a pulse or a digital signal.

SEE OR SEARCH THIS CLASS, SUBCLASS:
93.01 transmission of a digital message signal over a telephone line.

SEE OR SEARCH CLASS:
375, Pulse or Digital Communications, appropriate subclasses for nontelephone digital communication.

Subclass: 51 [Patents]

With automatic dialing or transmission of recorded audio message:
This subclass is indented under subclass 37. Subject matter to either (a) generate a predetermined call address signal for establishing a connection to a given telephone station, or (b) send a previously stored sound message signal over a telephone line response to an emergency condition.

SEE OR SEARCH THIS CLASS, SUBCLASS:
69 for a call originating arrangement which transmits, a previously recorded audio message, not limited to an emergency condition.

Subclass: 52 [Patents]

INCLUDING AID FOR HANDICAPPED USER (E.G., VISUAL, TACTILE, HEARING AID COUPLING):
This subclass is indented under the class definition. Subject matter particularly designed for use by a physically impaired individual.
(1) Note. Devices specifically for coupling a hearing aid to a telephone (e.g., magnetic pickup, microphone holder) are classified herein.

SEE OR SEARCH THIS CLASS, SUBCLASS:
395 for a terminal having an amplifying arrangement.

SEE OR SEARCH CLASS:
340, Communications: Electrical, subclass 825.19 for communication or control for the handicapped.

Subclass: 55.1 [Patents]

HAVING NEAR FIELD LINK (E.G., CAPACITIVE, INDUCTIVE):
This subclass is indented under the class definition. Subject matter having a transceiver, a base station, and a limited range system (i.e., field strength=k/d where k is a constant and d=distance between the transceiver and base station antennas) whereby signal transfer is inductive or capacitive, rather than electromagnetic.

SEE OR SEARCH CLASS:
246, Railway Switches and Signals, subclass 8 for similar subject matter used in train dispatching.
343, Communications: Radio Wave Antennas, 700 for an antenna used for baseband communication.
381, Electrical Audio Signal Processing Systems and Devices, subclass 79 for a one-way near field voice system.
455, Telecommunications, subclass 41 for a modulated carrier type near field communications system.

Subclass: 56.1 [Patents]

HAVING LIGHT WAVE OR ULTRASONIC LINK FOR SPEECH OR PAGING SIGNAL:
This subclass is indented under the class definition. Subject matter wherein a telephone circuit connection is made by a transmitted electromagnetic wave group capable of propagating at the velocity of light (about 186,281 miles per second), or which has sonic vibrations above that of audible sound (16,000 Hz).
(1) Note. For classification herein there must be some connection to a telephone landline, for example, where a connection is made through a telephone operator or exchange.
(2) Note. Optical telephones are classified herein. For subcombinations involving optical communication see the search notes below.

SEE OR SEARCH CLASS:
340, Communications: Electrical, subclass 311.1 for a generic paging arrangement.
359, Optics: Systems (Including Communication) and Elements, 109 for systems and subsystems using an optical carrier.
385, Optical Waveguides, appropriate subclasses for optical conducting elements, per se.

Subclass: 56.2 [Patents]

Including fiber optic link within telephone network:
This subclass is indented under subclass 56.1. Subject matter wherein the electromagnetic wave is a light wave which propagates within a light transmitting waveguide in a telephone network.

SEE OR SEARCH CLASS:
385, Optical Waveguides, appropriate subclasses for optical
conducting elements, per se.

Subclass: 56.3 [Patents]

Including infra-red link with landline telephone network:
This subclass is indented under subclass 56.1. Subject matter wherein the electromagnetic wave is in a range of radiation wavelengths invisible to the human eye lying between 750 nanometers and about 1 millimeter.

Subclass: 67.1 [Patents]

AUDIO MESSAGE STORAGE, RETRIEVAL, OR SYNTHESIS:
This subclass is indented under the class definition. System, process, or instrument for the two-way electrical transmission of intelligible audio information further comprising structure for the retention, recovery, or formation of an audio message signal.
(1) Note. Such storage or retrieval must include a telephone system component at least nominally claimed. Mere designation of the apparatus as a "telephone answering device" is, of itself, insufficient for classification in this or indented subclasses.

Subclass: 68 [Patents]

Dynamic audio signal recording or reproduction:
This subclass is indented under subclass 67.1. Subject matter which utilizes relative motion with respect to a record medium to perform the audio message storage or retrieval.

SEE OR SEARCH CLASS:
360, Dynamic Magnetic Information Storage or Retrieval, appropriate subclasses for a magnetic tape recorder.
369, Dynamic Information Storage or Retrieval, appropriate subclasses for a phonograph.

Subclass: 69 [Patents]

Call originating:
This subclass is indented under subclass 67.1. Subject
matter including generating station-designating signals for initiation of telephonic communication with a designated station and subsequently transmitting a reproduced announcement hereto or recording a message therefrom.
(1) Note. The communication established is for connection to the recorder or reproducer.
(2) Note. The subject matter herein may include sequential selection of designated stations.

SEE OR SEARCH THIS CLASS, SUBCLASS:
40 and 51, for similar subject matter to transmit fire, burglar, or police calls or alarms over the telephone system.
355 for an automatic telephone dialing device.

Subclass: 70 [Patents]

Call intercept or answering:
This subclass is indented under subclass 68. Subject matter including establishing of telephonic communication between a component connected to the recorder or reproducer and a distinct calling station connected to the telephone system in response to a calling signal initiated from the calling station.
(1) Note. The component is often the station being called.
(2) Note. The recorder or reproducer is usually actuated in response to the telephonic communication.
(3) Note. Such subject matter often includes both a reproducer for transmitting an announcement upon initial actuation and subsequently actuated recorder for generating a record of an incoming message.

Subclass: 71 [Patents]

Consecutive use of recorded phrases or words to form message:
This subclass is indented under subclass 70. Subject matter selectively supplying phrases or words in real time sequence to develop a complete announcement for transmission through the telephone system.
(1) Note. Typical of systems herein are time announcing systems in which different words are reproduced in a desired order so that the time is verbalized. For example: "The
time is" -- "twelve" -- "fifty" -- "four", in which each quoted phrase has been reproduced from the storage medium.
(2) Note. Time announcing systems not limited to a telephone system are classified in Class 369, subclass 23.

SEE OR SEARCH CLASS:
368, Horology: Time Measuring Systems or Devices, subclass 63 for time announcing systems having details of the time measuring system.
369, Dynamic Information Storage or Retrieval, subclass 23 for time announcing systems not limited to telephone equipment.
704, Data Processing: Speech Signal Processing, Linguistics, Language Translation, and Audio Compression/Decompression, 258 for speech synthesis based on sequential sounds or bits.

Subclass: 72 [Patents]

Sequential or repeated announcement during single call initiated cycle:
This subclass is indented under subclass 70. Subject matter wherein the announcement is restarted or changed so as to form a series or repeated or changed announcements.
(1) Note. A "series" means at least one repetition or modification of an initial announcement.

Subclass: 73 [Patents]

Plural record carrier channels:
This subclass is indented under subclass 70. Subject matter wherein a single record carrier in the recorder or reproducer has a plurality of distinct record tracks thereon.
(1) Note. The term "record carrier" is the tangible object upon which the recorded signal is stored.
(2) Note. The plural tracks may be transversely displaced from each other.
(3) Note. The plural record tracks are often used for recording distinct receive messages.

SEE OR SEARCH THIS CLASS, SUBCLASS:
72 for remote control over a telephone system.

SEE OR SEARCH CLASS:
369, Dynamic Information Storage or Retrieval, 24 for remote control of a recording or reproducing device other than by a telephone system.

Subclass: 74 [Patents]

Remote control over telephone line:
This subclass is indented under subclass 70. Subject matter which operates the recorder or reproducer for other than its normal call responsive operation by a specified signal transmitted over the telephone system.

SEE OR SEARCH THIS CLASS, SUBCLASS:
102 for remote control over a telephone system.

SEE OR SEARCH CLASS:
369, Dynamic Information Storage or Retrieval, 24 for remote control of a recording or reproducing device other than by a telephone system.

Subclass: 75 [Patents]

Remote dictation:
This subclass is indented under subclass 74. Subject matter for correction of the recorded message subsequent to recording and prior to reproduction of the final recorded incoming message.
(1) Note. Mere naming of a device as for "dictation" absent particular structure therefore is insufficient to provide classification in this subclass.

SEE OR SEARCH CLASS:
369, Dynamic Information Storage or Retrieval, 25 for dictation devices.

Subclass: 76 [Patents]

Announcement selection or replacement:
This subclass is indented under subclass 74. Subject matter wherein the operation includes choosing or changing a message to be transmitted by the reproducer to the telephone system
in response to an incoming call.
(1) Note. A selection system may be used for a stock quotation. Such a system not limited to a telephone system is classified in Class 340, Communications: Electrical, subclasses 825.26+.

Subclass: 77 [Patents]

Control by generated tone:
This subclass is indented under subclass 74. Subject matter wherein the specified signal has an audio frequency component.
(1) Note. Included herein is control by push button telephone devices.

Subclass: 78 [Patents]

Acoustic coupling:
This subclass is indented under subclass 70. subject matter wherein the connection between the telephone system component and the reproducer or recorder is effected by a sound wave produced and detected by a complementary pair of transducers.
(1) Note. Such subject matter often involves a pair of such acoustic links in opposite directions.

SEE OR SEARCH THIS CLASS, SUBCLASS:
444 for an acoustic telephone system coupler.

Subclass: 79 [Patents]

With specified call initiated cycle control circuitry:
This subclass is indented under subclass 70. Subject matter including circuitry to control the actuation or deactuation of the recorder or reproducer in response to a telephone system condition related to an incoming call.
(1) Note. For classification herein, either details of the circuitry or response to a particular condition other than call receipt is required. Mere nominal recitation of circuitry responsive to call receipt is not classifiable herein, as such response is necessarily inherent in a call answering or intercepting device.
(2) Note. The "call initiated cycle" is a sequence of reproducing and recording mode of the recording and reproducing device.

Subclass: 80 [Patents]

Voice signal presence responsive:
This subclass is indented under subclass 79. Subject matter wherein the cycle control circuitry is responsive to the continuation, cessation, or absence of an incoming audio signal.

SEE OR SEARCH THIS CLASS, SUBCLASS:
81 for similar subject matter responsive to any other line condition.
420 for voice control of a telephone.

SEE OR SEARCH CLASS:
369, Dynamic Information Storage or Retrieval, subclass 50 for voice control of a recording system.

Subclass: 81 [Patents]

Call termination responsive (e.g., hang-up):
This subclass is indented under subclass 79. Subject matter wherein the cycle control circuitry is responsive to a line condition representative of the cessation of telephonic communications (e.g., open circuit, dial tone presence).
(1) Note. Such cessation may be effected by the caller hanging up or being disconnected.

Subclass: 82 [Patents]

Having specified call initiation (e.g., ringing) responsive circuitry:
This subclass is indented under subclass 79. Subject matter including a detail of circuitry responsive to a system or component condition related to call alert signalling or start of receipt of call.

Subclass: 83 [Patents]

Structural detail of storage medium drive:
This subclass is indented under subclass 79. Subject matter including a specific mechanical feature of a mechanism for causing relative emotion of the record medium.

Subclass: 84 [Patents]

At switching facility (e.g., central office, switchboard):
This subclass is indented under subclass 70. Subject matter wherein the component connected to the recorder or reproducer is located at a switching station to which a plurality of telephone circuits are connected.

SEE OR SEARCH THIS CLASS, SUBCLASS:
89.4 for voice message storage or retrieval at a centralized location.

Subclass: 85 [Patents]

Recording of telephone signal during normal operation:
This subclass is indented under subclass 68. Subject matter wherein the record generated is of an audible signal in a telephone system, which signal exists independently of the recording device.
(1) Note. Normal operation includes, for example, two-way voice communication.

Subclass: 86 [Patents]

Inductive pickup:
This subclass is indented under subclass 85. Subject matter wherein the signal from the telephone system is coupled for record generating by two electrical devices having an interacting magnetic field.

SEE OR SEARCH THIS CLASS, SUBCLASS:
433 for an inductive telephone pickup.

Subclass: 87 [Patents]

Reproduced signal distributed over telephone line:
This subclass is indented under subclass 68. Subject matter wherein a reproduced information bearing audio signal is coupled by the telephone system to a remote station for conversion into sound.
(1) Note. This subclass includes use of a telephone system as a reproduced signal program distribution system.

SEE OR SEARCH THIS CLASS, SUBCLASS:
101 for audio program distribution over a telephone line, not limited to a reproduced signal.

SEE OR SEARCH CLASS:
381, Electrical Audio Signal Processing Systems and Devices, 77 for one-way audio signal program distribution, not limited to a telephone system.

Subclass: 88.01 [Patents]

Voice activation or recognition:
This subclass is indented under subclass 67.1. Audio message storage, retrieval, or synthesis system wherein the system is responsive to the presence or absence of a spoken word.

SEE OR SEARCH THIS CLASS, SUBCLASS:
88.15 for a pager device activated by an audio message signal.

Subclass: 88.02 [Patents]

Voice verification (e.g., voice authorization, voiceprint, etc.):
This subclass is indented under subclass 88.01. Voice activation or recognition wherein access to the system is gained when the received spoken word matches a stored authorization signal.

SEE OR SEARCH CLASS:
704, Data Processing: Speech Signal Processing, Linguistics, Language Translation, and Audio Compression/Decompression, 231 for speech signal processing and recognition using artificial intelligence.

Subclass: 88.03 [Patents]

Voice dialing:
This subclass is indented under subclass 88.01. Voice activation or recognition wherein a call address signal is initiated in response to a spoken word.

Subclass: 88.04 [Patents]

Voice controlled message management:
This subclass is indented under subclass 88.01. Voice activation or recognition wherein the audio message signal is manipulated or routed in response to a spoken word.

SEE OR SEARCH THIS CLASS, SUBCLASS:
88.22 for a process for organizing or controlling the receipt or delivery of a voice message.

Subclass: 88.05 [Patents]

Multilingual system or operation:
This subclass is indented under subclass 67.1. Audio message storage, retrieval, or synthesis system wherein the system is capable of manipulating or generating an audio message signal in more than one linguistical format.

SEE OR SEARCH CLASS:
704, Data Processing: Speech Signal Processing, Linguistics, Language Translation, and Audio Compression/Decompression, subclass 8 for a means or step to adapt to, process, or support plural languages in systems or in software, or to support the conventions or peculiarities of various national languages.

Subclass: 88.06 [Patents]

Language selection:
This subclass is indented under subclass 88.05. Multilingual system or operation wherein the system provides options enabling a user to select the linguistic format for the manipulation, storage, retrieval, or generation of an audio message signal.

Subclass: 88.07 [Patents]

Digital Signal Processing (DSP):
This subclass is indented under subclass 67.1. Audio message storage, retrieval, or synthesis system further comprising an operation in which an analog audio message signal is manipulated or processed in a digital format.

SEE OR SEARCH CLASS:
395, Information Processing System Organization, subclass 800.35 for an auxiliary processor configured to perform high speed data manipulations.

Subclass: 88.08 [Patents]

Message signal analysis:
This subclass is indented under subclass 67.1. Audio message storage, retrieval, or synthesis system wherein the audio message signal is examined.

Subclass: 88.09 [Patents]

Statistical analysis (e.g., time, date, length of message, etc.):
This subclass is indented under subclass 88.08. Message signal analysis further comprising a means to collect, organize, or interpret specific quantitative audio message signal data.

SEE OR SEARCH THIS CLASS, SUBCLASS:
111 for a means to determine the length, number, frequency, or cost of telephone usage combined with telephone equipment.

Subclass: 88.1 [Patents]

Including data compression:
This subclass is indented under subclass 88.08. Message signal analysis further comprising a method for reducing the size of the audio message signal by eliminating unnecessary information, such as blank or redundant data for efficient storage, transmission, or organization.

SEE OR SEARCH CLASS:
341, Coded Data Generation or Conversion, subclass 60 for converting to or from codes comprising more than one shorter
data words so that they can be handled by a machine component designed for longer data words.
364, Electrical Computers and Data Processing Systems, subclass 715.02 for representing a number or group of numbers by a smaller number of digits than that possessed originally or the inverse operation.
395, Information Processing System Organization, subclass 200.77 for a multicomputer data transfer ring having a means to reduce the transfer payload volume or to recover the data from a compressed payload, and subclass 888 for data compression or expansion for improving transfer efficiency between peripheral devices.

Subclass: 88.11 [Patents]

Display of message related information:
This subclass is indented under subclass 67.1. Audio message storage, retrieval, or synthesis system having a means to view data or information relating to the audio message signal in a visual format.

SEE OR SEARCH THIS CLASS, SUBCLASS:
88.12 for an audio message storage, retrieval, or synthesis system having a visual or audio message notification.

SEE OR SEARCH CLASS:
345, Computer Graphics Processing, Operator Interface Processing, and Selective Visual Display Systems, appropriate subclasses for a process or apparatus for selective electrical control of two or more light-generating or light-controlling display elements.

Subclass: 88.12 [Patents]

Indication or notification of message:
This subclass is indented under subclass 67.1. Audio message storage, retrieval, or synthesis system further comprising an audio or visual signal alerting the user to the presence of a recorded or stored audio message signal.

SEE OR SEARCH THIS CLASS, SUBCLASS:
88.11 for an audio message storage, retrieval, or synthesis system having a means to view data or information relating to an audio message signal.

SEE OR SEARCH CLASS:
340, Communications: Electrical, 500 for a conditional response indicating system.

Subclass: 88.13 [Patents]

Multimedia system (e.g., voice output combined with fax, video, text, etc.):
This subclass is indented under subclass 67.1. Audio message storage, retrieval, or synthesis system further comprising a means to accept or transmit an audio message signal in a secondary format.

Subclass: 88.14 [Patents]

Presentation format conversion:
This subclass is indented under subclass 88.13. Multimedia system having a means to convert the audio message signal data to a user specified format.

Subclass: 88.15 [Patents]

Pager activation:
This subclass is indented under subclass 88.13. Multimedia system wherein a pager device is activated in response to an audio message signal.

SEE OR SEARCH THIS CLASS, SUBCLASS:
88.01 for a voice activated audio message storage, retrieval, or synthesis system.

SEE OR SEARCH CLASS:
340, Communications: Electrical, subclass 331.1 for a paging system and 825.44+ for a selective communication system with a paging means.

Subclass: 88.16 [Patents]

Voice message synthesis:
This subclass is indented under subclass 67.1. Audio message storage, retrieval, or synthesis system further comprising a means to formulate a system-generated spoken message.

SEE OR SEARCH CLASS:
704, Data Processing: Speech Signal Processing, Linguistics, Language Translation, and Audio Compression/Decompression, 258 for a system wherein component parts of a speech signal are combined to produce a synthetic speech output.

Subclass: 88.17 [Patents]

Interaction with an external nontelephone network (e.g., Internet):
This subclass is indented under subclass 67.1. Audio message storage, retrieval, or synthesis system wherein the telephone system is capable of transmitting and receiving audio message signal information over a secondary network.

SEE OR SEARCH THIS CLASS, SUBCLASS:
90.01 for a telephone line or system in combination with a diverse electrical system or signaling.

SEE OR SEARCH CLASS:
395, Information Processing System Organization, 200.3 for multicomputer data transferring.

Subclass: 88.18 [Patents]

Interacting voice message systems:
This subclass is indented under subclass 67.1. Audio message storage, retrieval, or synthesis system wherein a voice message signal is processed by plural intercommunicating messaging.

Subclass: 88.19 [Patents]

Call source identification:
This subclass is indented under subclass 67.1. Audio message storage, retrieval, or synthesis system wherein a means is provided to disclose information regarding an originating call signal.

SEE OR SEARCH THIS CLASS, SUBCLASS:
88.11 for the display of message related information.
142 for calling number display or recording at called substation.

Subclass: 88.2 [Patents]

Automatic Number Identification (ANI):
This subclass is indented under subclass 88.19. Call source identification wherein the disclosed information is an originating telephone number.
Note: A positive recitation of an Automatic Number Identification (ANI) is required for classification in this subclass.

Subclass: 88.21 [Patents]

Caller identification received at substation:
This subclass is indented under subclass 88.19. Call source identification wherein the disclosed information relating to the incoming call is forwarded to a substation.

Subclass: 88.22 [Patents]

Message management:
This subclass is indented under subclass 67.1. Audio message storage, retrieval, or synthesis system further including a process for organizing, directing, distributing, or switching an incoming or outgoing audio message signal.

Subclass: 88.23 [Patents]

Controlled by subscriber or caller:
This subclass is indented under subclass 88.22. Call management system wherein the organization, distribution, or switching of an incoming or outgoing audio message signal is completed in response to an input from the message recipient or originator.

Subclass: 88.24 [Patents]

By generated tone:
This subclass is indented under subclass 88.23. Subscriber or caller controlled audio signal management system wherein the controlling input is a system generated signal having a
specified acceptable pitch.

Subclass: 88.25 [Patents]

Message storage in centralized location (e.g., central office, PBX, etc.):
This subclass is indented under subclass 88.23. Subscriber or caller controlled audio message signal management system wherein the audio message signal is held in a centralized memory location.

Subclass: 88.26 [Patents]

Recording voice message from nonsubscriber caller:
This subclass is indented under subclass 88.25. Centralized stored message wherein the stored audio message signal is generated by a system nonsubscriber.

Subclass: 88.27 [Patents]

Separate storage for voice and control information:
This subclass is indented under subclass 88.22. Call management system wherein message information and system instructional information are stored in discrete memory locations.

Subclass: 88.28 [Patents]

Solid state memory storage:
This subclass is indented under subclass 88.22. Call management system wherein the memory allocation is solid state.

SEE OR SEARCH CLASS:
365, Static Information Storage and Retrieval, appropriate subclasses for an apparatus or corresponding process for the static storage and retrieval of information.

Subclass: 90.01 [Patents]

TELEPHONE LINE OR SYSTEM COMBINED WITH DIVERSE ELECTRICAL SYSTEM OR SIGNALLING (E.G., COMPOSITE):
This subclass is indented under the class definition. Subject matter wherein a nontelephone signal is transmitted over a conductor of telephone signals, or a telephone signal is transmitted over nontelephone electrical circuitry.

SEE OR SEARCH THIS CLASS, SUBCLASS:
66 for a telephone carrier over a power line.
110 for a composite telephone set.

SEE OR SEARCH CLASS:
340, Communications: Electrical, 310.01 for signalling over a diverse electrical line.
370, Multiplex Communications, appropriate subclasses for simultaneous transmission of a telephone signal and another electrical communications signal, or multiplexing plural telephone signals, over a common channel.

Subclass: 90.02 [Patents]

Using Internet:
This subclass is indented under subclass 90.01. Subject matter wherein the transmission involves TCP/IP (Transmission Control Protocol/Internetwork Protocol).

Subclass: 91.01 [Patents]

Credit authorization:
This subclass is indented under subclass 90.01. Subject matter wherein the nontelephone signal is used to permit or deny a charge to an individual account over a telephone line.

SEE OR SEARCH THIS CLASS, SUBCLASS:
144 for a credit card operated pay station.

SEE OR SEARCH CLASS:
235, Registers, 380 for a credit card operated register having significant card reading structure.
340, Communications: Electrical, subclass 825.33 for remote credit authorization, not limited to use of telephone equipment.
395, Information Processing System Organization, 201 for
business oriented applications for computers.

Subclass: 91.02 [Patents]

At switching station:
This subclass is indented under subclass 91.01. Subject matter including a switching facility having structure or circuitry for credit transaction processing.

Subclass: 92.01 [Patents]

Polling:
This subclass is indented under subclass 90.01. Subject matter wherein plural controlled devices transmit a personal or personal choice status signal in response to an interrogation signal.
(1) Note. The personal or personal choice signal may be successively transmitted.

SEE OR SEARCH CLASS:
348, Television, 13 for television two-way interactive.
455, Telecommunications, subclass 2 for radio audience survey and use of telephone equipment.

Subclass: 92.02 [Patents]

Televoting:
This subclass is indented under subclass 92.01. Subject matter wherein the personal or personal choice status signal is used to cast a vote.

SEE OR SEARCH CLASS:
395, Information Processing System Organization, subclass 212 for voting.

Subclass: 92.03 [Patents]

Having central station equipment:
This subclass is indented under subclass 92.01. Subject matter including a central station with specific structure or circuitry for status signal processing.

Subclass: 92.04 [Patents]

Having subscriber station equipment:
This subclass is indented under subclass 92.01. Subject matter including a user terminal with specific structure or circuitry for generating or transmitting the status signal.

Subclass: 93.01 [Patents]

Having transmission of a digital message signal over a telephone line:
This subclass is indented under subclass 90.01. Subject matter for transfer of message information by either a multi-level pulse signal or a data signal consisting of a series of ones and zeros, over a line specifically described as a telephone line.

SEE OR SEARCH CLASS:
370, Multiplex Communications, appropriate subclasses for simultaneous voice and data communications.
375, Pulse or Digital Communications, subclass 222 for modems or data sets, per se.
709, Electrical Computers and Digital Data Processing Systems: Multiple Computer or Process Coordinating, 200 for data transferring among multiple computer and digital processing systems.
710, Electrical Computers and Digital Data Processing Systems: Input/Output, 1 for transferring data from one or more peripherals to one or more computers or digital data processing systems for the latter to process, store, or further transfer or for transferring data from the computers or digital data processing systems to the peripherals.

Subclass: 93.02 [Patents]

Access restricting:
This subclass is indented under subclass 93.01. Subject matter which permits or denies the rights to use remote digital computing or communication equipment.

SEE OR SEARCH CLASS:
707, Data Processing: Database and File Management, Data
Structures, Or Document Processing, subclass 9 for privileged access to a database or file in a computer environment.
710, Electrical Computers and Digital Data Processing Systems: Input/Output, 36 for digital data processing system Input/Out access regulating and subclasses 107+ for bus access regulating in a digital data processing system.
713, Electrical Computers and Digital Processing Systems: Support, subclasses 182-186 for system access control based on cryptographic user identification.

Subclass: 93.03 [Patents]

Personal identification:
This subclass is indented under subclass 93.02. Subject matter whereby access is granted by matching user characteristics (e.g., voiceprint, fingerprint, signature) of the person desiring access.

SEE OR SEARCH CLASS:
382, Image Analysis, 115 for personnel identification.

Subclass: 93.04 [Patents]

Two or more calls:
This subclass is indented under subclass 93.02. Subject matter whereby gaining access requires multiple calls.

Subclass: 93.05 [Patents]

Terminal interface circuitry:
This subclass is indented under subclass 93.01. Subject matter having a specific electronic arrangement interrelating a device or equipment to the telephone line.

SEE OR SEARCH THIS CLASS, SUBCLASS:
399 for connecting a telephone communications line to a central switching office or a subscriber station.
442 for connecting a device to the line by direct connection through the terminal.

Subclass: 93.06 [Patents]

Digital:
This subclass is indented under subclass 93.05. Subject matter wherein the interface circuitry is connected to a telephone line in which the information is encoded as a series of ones and zeros.

Subclass: 93.07 [Patents]

To plural lines or networks:
This subclass is indented under subclass 93.05. Subject matter wherein the interface circuitry is for connecting to at least two telephone lines or groups of stations.

Subclass: 93.08 [Patents]

Transmission scheme (e.g., compression/decompression, transmission rate):
This subclass is indented under subclass 93.01. Subject matter including a particular detail of a methodology in which the message signal is conveyed.

SEE OR SEARCH THIS CLASS, SUBCLASS:
93.31 for modulated signal transmission scheme.
100.17 for image data transmission scheme.

SEE OR SEARCH CLASS:
348, Television, 17 for video signal transmission scheme.

Subclass: 93.09 [Patents]

Switching between different terminal types (e.g., voice/data switch):
This subclass is indented under subclass 93.01. Subject matter including an arrangement for selecting between diverse communication modes.

SEE OR SEARCH THIS CLASS, SUBCLASS:
100.15 for switching to other communication modes in which the communication modes include a visual-s:graphic copy reproduction mode (e.g., facsimile mode).

Subclass: 93.11 [Patents]

Among at least three terminal types:
This subclass is indented under subclass 93.09. Subject matter wherein the arrangement includes switching among at least three different modes.

Subclass: 93.12 [Patents]

Sales, ordering, or banking system:
This subclass is indented under subclass 93.01. Subject matter wherein the transmitted digital message signal is used for financial transactions.

SEE OR SEARCH CLASS:
395, Information Processing System Organization, 201 for business oriented applications for computers.

Subclass: 93.13 [Patents]

Amusement (e.g., game, lottery):
This subclass is indented under subclass 93.01. Subject matter wherein the digital message signal is for conducting a recreational activity.

SEE OR SEARCH CLASS:
455, Telecommunications, subclass 6.3 for entertainment systems.
463, Amusement Devices: Games, subclass 41 for games with a telephonic communication link.

Subclass: 93.14 [Patents]

Having switching station:
This subclass is indented under subclass 93.01. Subject matter including equipment which performs the functions of establishing and releasing connections and includes structure or circuitry for digital message signal processing.

Subclass: 93.15 [Patents]

Having format conversion:
This subclass is indented under subclass 93.14. Subject matter wherein an electronic structure is particularly adapted for transforming the digital message signal from one form into another form (e.g., text-to-voice, voice-to-text, etc.).

SEE OR SEARCH THIS CLASS, SUBCLASS:
100.13 for image format conversion.

Subclass: 93.16 [Patents]

Diverse networks (e.g., PSTN, ISDN):
This subclass is indented under subclass 93.14. Subject matter including at least two different types of telephone systems.
(1) Note. PSTN stands for Public Switched Telephone Network, and ISDN stands for Integrated Services Digital Network.

Subclass: 93.17 [Patents]

Having station display:
This subclass is indented under subclass 93.01. Subject matter including a structure particularly adapted for conversion of a digital information signal into a visual message signal.

SEE OR SEARCH THIS CLASS, SUBCLASS:
28 for testing of such an instrument.
142 376, and 386, for subject matter drawn to perceptible display of supervisory control signals.

SEE OR SEARCH CLASS:
375, Pulse or Digital Communications, 219 for a digital signal transceiver.

Subclass: 93.18 [Patents]

Having tone code recognition for generating alphanumeric characters:
This subclass is indented under subclass 93.17. Subject matter including an arrangement for character or symbol pattern recognition to show letters of the alphabet or numerals.

SEE OR SEARCH THIS CLASS, SUBCLASS:
93.27 for generating alphanumeric information by tone codes.

SEE OR SEARCH CLASS:
345, Selective Visual Display Systems, 25 for alphanumeric display and character generator.

Subclass: 93.19 [Patents]

Having pressure or position sensitive surface (e.g., touch-screen, light pen):
This subclass is indented under subclass 93.17. Subject matter wherein the terminal display includes input means responsive to force or location along the display face.

SEE OR SEARCH CLASS:
178, Telegraphy, subclass 18 and 87 for stylus and tablet.
345, Selective Visual Display Systems, 173 for touch panels, subclass 179 for stylus, and subclasses 180+ for light pen.

Subclass: 93.21 [Patents]

Having conferencing:
This subclass is indented under subclass 93.17. Subject matter which enables three or more data terminals on distinct subscriber lines to be included in a single call connection.

SEE OR SEARCH THIS CLASS, SUBCLASS:
202 for telephone conferencing.

SEE OR SEARCH CLASS:
348, Television, subclass 15 for video conferencing.
370, Multiplex Communications, 260 for special services with conferencing.

Subclass: 93.22 [Patents]

At pay station:
This subclass is indented under subclass 93.17. Subject matter wherein the structure includes a public telephone from which calls can be paid for by means of currency, credit, or debit.

SEE OR SEARCH THIS CLASS, SUBCLASS:
91.01 for credit authorization.
143 for check operated control (e.g., pay station).

Subclass: 93.23 [Patents]

Having user information display (e.g., telephone number, name, address, etc.):
This subclass is indented under subclass 93.17. Subject matter wherein the visual message signal is personal data.

SEE OR SEARCH THIS CLASS, SUBCLASS:
142 for calling number display.
354 for called number display.

Subclass: 93.24 [Patents]

Having electronic mail:
This subclass is indented under subclass 93.17. Subject matter wherein the information signal is assigned to a memory location for storage and retrieved by a station having access to the memory location (e.g., text mail).

SEE OR SEARCH THIS CLASS, SUBCLASS:
89.2 for subscriber or caller control of central office audio message storage or retrieval.
100.08 for image electronic mailbox system.

SEE OR SEARCH CLASS:
358, Facsimile and Static Presentation Processing, subclass 402 for electronic mailbox.

Subclass: 93.25 [Patents]

Having remote database (e.g., videotex system):
This subclass is indented under subclass 93.17. Subject matter including a database having structure or circuitry for supplying information in electronic form from the database to subscriber terminals.

SEE OR SEARCH THIS CLASS, SUBCLASS:
100.11 for image information retrieval.

SEE OR SEARCH CLASS:
348, Television, subclass 7 for broadcast on demand and subclass 13 for two-way interactive communication.
358, Facsimile and Static Presentation Processing, subclass 403 for document filing and retrieval system.
455, Telecommunications, 4.1 for remote control of distribution.

Subclass: 93.26 [Patents]

By voice frequency signal (e.g., tone code):
This subclass is indented under subclass 93.01. Subject matter wherein the pulse or data signal is specifically described as converted into one or more tones lying within the audible frequency spectrum.

SEE OR SEARCH CLASS:
375, Pulse or Digital Communications, 219 for modems and digital transceivers, per se.

Subclass: 93.27 [Patents]

Alphanumeric:
This subclass is indented under subclass 93.26. Subject matter including a structure particularly adapted for recognition of tone codes generated via dual-tone, multi-frequency signals into letters or numbers.

SEE OR SEARCH THIS CLASS, SUBCLASS:
93.18 for display of alphanumeric characters generated using tone code recognition.

Subclass: 93.28 [Patents]

Modulated audio tone:
This subclass is indented under subclass 93.26. Subject matter wherein a pulse or data signal causes a variation in the frequency, phase, or amplitude of an audible tone.

SEE OR SEARCH CLASS:
375, Pulse or Digital Communications, subclass 222 for modems.

Subclass: 93.29 [Patents]

Reconfigurable:
This subclass is indented under subclass 93.28. Subject matter wherein communication operating parameters can be reprogrammed to conform with different communication standards or perform different communication modes.

Subclass: 93.31 [Patents]

Protocol:
This subclass is indented under subclass 93.28. Subject matter including particular details of transmission scheme.

SEE OR SEARCH THIS CLASS, SUBCLASS:
93.08 for transmission scheme, not limited to use of modem.
100.17 for image data transmission scheme.

SEE OR SEARCH CLASS:
348, Television, 17 for video signal transmission scheme.

Subclass: 93.32 [Patents]

Initial setup:
This subclass is indented under subclass 93.31. Subject matter including a particular start-up handshaking sequence.

Subclass: 93.33 [Patents]

Having adjustable speed:
This subclass is indented under subclass 93.31. Subject matter wherein the transmission protocol includes different data transmission rates.

Subclass: 93.34 [Patents]

Having recognition and selection:
This subclass is indented under subclass 93.31. Subject matter including determination of one of a plurality of modulator-demodulator types and for connecting to a compatible type.

Subclass: 93.35 [Patents]

Having call-waiting:
This subclass is indented under subclass 93.28. Subject matter for signalling a first station in communication with a second station that a third station desires communication with the first station.

SEE OR SEARCH THIS CLASS, SUBCLASS:
215 for call waiting with telephone equipment.

SEE OR SEARCH CLASS:
370, Multiplex Communications, 259 for special services.
455, Telecommunications, 414 for special services in a radiotelephone system.

Subclass: 93.36 [Patents]

Line powered:
This subclass is indented under subclass 93.28. Subject matter including particular circuitry for deriving power from the telephone line to data communication equipment (DCE).

SEE OR SEARCH THIS CLASS, SUBCLASS:
102.04 for remote control of power source.

Subclass: 93.37 [Patents]

Having acoustic link:
This subclass is indented under subclass 93.26. Subject matter wherein a digital signalling device is connected to a telephone line by a sound wave passing between a complementary pair of electroacoustic transducers.

SEE OR SEARCH THIS CLASS, SUBCLASS:
78 for an acoustic link between a telephone answering device and a telephone line.
444 for a telephone acoustic coupler, per se.

Subclass: 100.01 [Patents]

To produce visual-s:graphic copy (e.g., facsimile):
This subclass is indented under subclass 90.01. Subject matter where the nontelephone signal is a visual or s:graphic representation of a document for producing a visually readable reproduction at a receiving station.

SEE OR SEARCH CLASS:
358, Facsimile and Static Presentation Processing, 500 for natural color facsimile, in general; and subclasses 400+ for facsimile.

Subclass: 100.02 [Patents]

Having detachable device (e.g., detachable storage medium, scanner):
This subclass is indented under subclass 100.01. Subject matter having an arrangement wherein an element can be separated from a main unit.

SEE OR SEARCH THIS CLASS, SUBCLASS:
357 for insertable call signal generation circuitry (e.g., card).

SEE OR SEARCH CLASS:
358, Facsimile and Static Presentation Processing, 473 for hand-held reader.

Subclass: 100.03 [Patents]

Usage system:
This subclass is indented under subclass 100.01. Subject
matter wherein data related to each transmission operation is recorded or generated.

Subclass: 100.04 [Patents]

Communication charge calculation:
This subclass is indented under subclass 100.01. Subject matter wherein the cost of the transmission is tabulated.

SEE OR SEARCH THIS CLASS, SUBCLASS:
111 for usage measurement.

Subclass: 100.05 [Patents]

Monitoring:
This subclass is indented under subclass 100.01. Subject matter wherein a condition of a visual-s:graphic copy reproduction is sensed or determined.

SEE OR SEARCH THIS CLASS, SUBCLASS:
1 for diagnostic testing, malfunction indication, or electrical condition measurement.

SEE OR SEARCH CLASS:
358, Facsimile and Static Presentation Processing, subclass 406 and 441 for facsimile calibrating and alarm.

Subclass: 100.06 [Patents]

Communication status notification:
This subclass is indented under subclass 100.01. Subject matter wherein information relating to a transmission/reception or line state is indicated.

Subclass: 100.07 [Patents]

Using mark sheet:
This subclass is indented under subclass 100.01. Subject matter performing operations based on information read from a marked form.

SEE OR SEARCH CLASS:
235, Registers, 375 for systems controlled by data bearing records.
358, Facsimile and Static Presentation Processing, subclass 468 for facsimile control.

Subclass: 100.08 [Patents]

Electronic mailbox:
This subclass is indented under subclass 100.01. Subject matter wherein the transmitted message is assigned to a memory location for storage and retrieved by a station having access to the memory location.

SEE OR SEARCH THIS CLASS, SUBCLASS:
89.2 for subscriber or caller control of central office audio message storage or retrieval.
93.24 for electronic mail messaging system, not limited to use of facsimile equipment.

SEE OR SEARCH CLASS:
358, Facsimile and Static Presentation Processing, subclass 402 for electronic mailbox.

Subclass: 100.09 [Patents]

Relay system:
This subclass is indented under subclass 100.01. Subject matter wherein the message is transmitted to some intermediate point, and at a later time, further retransmitted to a remote destination.

SEE OR SEARCH CLASS:
358, Facsimile and Static Presentation Processing, subclass 407 for facsimile relay system.
455, Telecommunications, 7 for signal repeaters that may regenerate the repeated signal and which are used in radio systems.

Subclass: 100.11 [Patents]

From a library:
This subclass is indented under subclass 100.01. Subject matter wherein the visual or s:graphic information accessed is from a collection of such information.

SEE OR SEARCH THIS CLASS, SUBCLASS:
93.25 for remote database, not limited to use of facsimile equipment.

SEE OR SEARCH CLASS:
358, Facsimile and Static Presentation Processing, subclass 403 for document filing and retrieval system.

Subclass: 100.12 [Patents]

Connection to plural networks or lines:
This subclass is indented under subclass 100.01. Subject matter including connection to at least two telephone lines or networks.

SEE OR SEARCH THIS CLASS, SUBCLASS:
93.07 for plural networks or lines, not limited to use of facsimile equipment.

Subclass: 100.13 [Patents]

Format conversion:
This subclass is indented under subclass 100.01. Subject matter having a specific structure for transforming the nontelephone signal to another form (e.g., image-to-voice, image-to-text, etc.).

SEE OR SEARCH THIS CLASS, SUBCLASS:
93.15 for format conversion at switching station.

Subclass: 100.14 [Patents]

Call signal generation (e.g., auto-dial):
This subclass is indented under subclass 100.01. Subject matter wherein a called station address signal is transmitted.

SEE OR SEARCH THIS CLASS, SUBCLASS:
355 for repertory or abbreviated call signal generation.

SEE OR SEARCH CLASS:
358, Facsimile and Static Presentation Processing, subclass 440 for telephone number or address of designator.
455, Telecommunications, subclass 564 for radiotelephone equipment with auto-dialing or repertory dialing.

Subclass: 100.15 [Patents]

Having switching to other communication modes:
This subclass is indented under subclass 100.01. Subject matter including an arrangement enabling connection between different communication types.

SEE OR SEARCH THIS CLASS, SUBCLASS:
93.09 for switching between different communication modes, not limited to use of facsimile equipment.

Subclass: 100.16 [Patents]

Voice mode:
This subclass is indented under subclass 100.15. Subject matter wherein the different communication types include an intelligible human sound mode.

SEE OR SEARCH THIS CLASS, SUBCLASS:
67.1 for audio message storage, retrieval, or synthesis.

Subclass: 100.17 [Patents]

Transmission scheme:
This subclass is indented under subclass 100.01. Subject matter including a particular detail of the transmission protocol.

SEE OR SEARCH THIS CLASS, SUBCLASS:
93.08 for transmission scheme, not limited to use of facsimile equipment.
93.31 for modulated signal transmission scheme.

SEE OR SEARCH CLASS:
348, Television, 17 for video signal transmission scheme.

Subclass: 101.01 [Patents]

Audio program distribution:
This subclass is indented under subclass 90.01. Subject matter where an audio program is transmitted to subscribers over a telephone system.

SEE OR SEARCH THIS CLASS, SUBCLASS:
87 for program distribution of dynamically retrieved audio signal (e.g., from a storage medium).

SEE OR SEARCH CLASS:
348, Television, 6 for television program distribution.
381, Electrical Audio Signal Processing Systems and Devices, 77 for one-way audio signal program distribution.
455, Telecommunications, 3.1 for radio program distribution, other than by telephone equipment.

Subclass: 102.01 [Patents]

Remote control:
This subclass is indented under subclass 90.01. Subject matter wherein the signal is used to operate a distant device over a telephone line.

SEE OR SEARCH THIS CLASS, SUBCLASS:
74 for remote control of a telephone answering device.

SEE OR SEARCH CLASS:
340, Communications: Electrical, 825 for remote control system not specified as using a telephone line.

Subclass: 102.02 [Patents]

Communication device:
This subclass is indented under subclass 102.01. Subject matter wherein the device has the primary function of receiving or transmitting information.

Subclass: 102.03 [Patents]

Entertainment appliance (e.g., TV, VCR, radio, etc.):
This subclass is indented under subclass 102.02. Subject matter wherein the device converts media signals into humanly perceivable signals, typically sight or sound, or records the media signals for later playback.

SEE OR SEARCH CLASS:
348, Television, subclass 734 for remote control device not specified as using a telephone line.
455, Telecommunications, 352 for remote control of a radio receiver.

Subclass: 102.04 [Patents]

Power source:
This subclass is indented under subclass 102.02. Subject matter wherein the control is directed toward applying electric energy to the communication equipment.

SEE OR SEARCH THIS CLASS, SUBCLASS:
93.36 for power supply of modem.

Subclass: 102.05 [Patents]

Of heating, ventilation, air conditioner (e.g., HVAC):
This subclass is indented under subclass 102.01. Subject matter wherein the device controls a climate or circulates air.

Subclass: 102.06 [Patents]

Of physical entrance or exit lock:
This subclass is indented under subclass 102.01. Subject matter wherein the control restricts movement of a person by permitting or preventing ingress or egress through a door or other similar structural closure.

SEE OR SEARCH THIS CLASS, SUBCLASS:
167 for an intercom system.

SEE OR SEARCH CLASS:
70, Locks, appropriate subclasses for a lock.
235, Registers, subclass 382 for coded record controlled access control.
340, Communications: Electrical, 825.31 for an electrical access control arrangement responsive to intelligence comparison.

Subclass: 102.07 [Patents]

Having indication:
This subclass is indented under subclass 102.01. Subject matter wherein a condition or state of the controlled device is reported in humanly perceivable form.

Subclass: 106.01 [Patents]

Remote indication over telephone line (e.g., telemetry):
This subclass is indented under subclass 90.01. Subject matter for providing a signal representing a sensed condition at a distant station via the telephone line.

SEE OR SEARCH THIS CLASS, SUBCLASS:
39 for similar subject matter which is responsive to an emergency or alarm condition.

SEE OR SEARCH CLASS:
340, Communications: Electrical, 500 for sensed condition attainment signalling and subclasses 870.01+ for telemetering system.

Subclass: -2 [Patents]

106.02 Patient monitoring:
This subclass is indented under subclass 106.01. Subject matter wherein the sensed condition includes medical data of an individual.

SEE OR SEARCH CLASS:
128, Surgery, subclass 904 for telephone telemetry.

Subclass: 106.03 [Patents]

Meter reading:
This subclass is indented under subclass 106.01. Subject matter where the sensed condition is a measurement of a quantitative indicating device.

SEE OR SEARCH CLASS:
340, Communications: Electrical, 870.02 for telemetering of a meter indication.

Subclass: 106.04 [Patents]

Having power supply circuitry:
This subclass is indented under subclass 106.03. Subject matter including particular electrical devices for connecting electrical energy to the meter.

Subclass: 106.05 [Patents]

Having ringing suppression:
This subclass is indented under subclass 106.03. Subject matter wherein the signal is exchanged between a central station and the subscriber's telephone without causing the telephone bell to sound.

SEE OR SEARCH THIS CLASS, SUBCLASS:
106.09 for ringing suppression, not limited to use of meter reading equipment.

Subclass: 106.06 [Patents]

Having time window:
This subclass is indented under subclass 106.03. Subject matter wherein the sensed condition is transmitted to a central station at an appointed time period.

Subclass: 106.07 [Patents]

Having interrogation signal:
This subclass is indented under subclass 106.03. Subject
matter wherein the sensed condition is transmitted to a central station in response to a request signal initiated by the central station.

SEE OR SEARCH THIS CLASS, SUBCLASS:
106.11 for interrogation signal, not limited to use of meter reading equipment.

Subclass: 106.08 [Patents]

Having line status detection:
This subclass is indented under subclass 106.03. Subject matter including an arrangement for sensing an electrical state of a subscriber circuit.

SEE OR SEARCH THIS CLASS, SUBCLASS:
377 for line or loop condition detection.

Subclass: 106.09 [Patents]

Ringing suppression:
This subclass is indented under subclass 106.01. Subject matter wherein the signal is exchanged between a central station and the subscriber's telephone without causing the telephone bell to sound.

SEE OR SEARCH THIS CLASS, SUBCLASS:
106.05 for ringing suppression of meter reading equipment.

Subclass: 106.11 [Patents]

Interrogation signal:
This subclass is indented under subclass 106.01. Subject matter wherein the signal is transmitted to a central station in response to a request signal initiated by the central station.

SEE OR SEARCH THIS CLASS, SUBCLASS:
106.07 for interrogation signal of meter reading equipment.

Subclass: 108.01 [Patents]

Telegraphy:
This subclass is indented under subclass 90.01. Subject matter for transmitting a telephone signal over a telegraph circuit.

SEE OR SEARCH THIS CLASS, SUBCLASS:
93 for transmission of a digital message signal over telephone equipment.

SEE OR SEARCH CLASS:
178, Telegraphy, 79 for transmitters and subclasses 118+ for receivers.
370, Multiplex Communications, subclass 214 for simultaneous telegraphy and telephony.

Subclass: 108.02 [Patents]

Over telephone line:
This subclass is indented under subclass 108.01. Subject matter for transmitting a telegraph signal over a telephone line.

Subclass: 110.01 [Patents]

COMPOSITE SUBSTATION OR TERMINAL (E.G., HAVING CALCULATOR, RADIO):
This subclass is indented under the class definition. Subject matter in which a telephone instrument also has structure or circuitry for performing a diverse independent (i.e., nontelephone) function.
(1) Note. There may be a relationship between the telephone and diverse function, as in diverse audio muting.

SEE OR SEARCH THIS CLASS, SUBCLASS:
90 for a composite telephone further including transmission of diverse signals or over a diverse line.

SEE OR SEARCH CLASS:
455, Telecommunications, 344 for a receiver combined with diverse art device.
708, Electrical Computers: Arithmetic Processing and Calculating, subclass 109 for a digital calculating computer combined with a telephone or other communication device.

Subclass: 111 [Patents]

WITH USAGE MEASUREMENT (E.G., CALL OR TRAFFIC REGISTER):
This subclass is indented under the class definition. Subject matter which determines the length, number, frequency, or cost of telephone usage and is combined with telephone equipment.
(1) Note. The telephone usage determining equipment, per se, is classifiable elsewhere.
(2) Note. Such equipment often includes a register for counting calls, or determining time of usage.

SEE OR SEARCH THIS CLASS, SUBCLASS:
13 for testing of usage measurement equipment.

SEE OR SEARCH CLASS:
235, Registers, subclass 91 for a mechanical register operated by a telephone.
368, Horology: Time Measuring Systems or Devices, subclass 4 for a horological device controlled by a nominally recited telephone.
377, Electrical Pulse Counters, Pulse Dividers, or Shift Registers: Circuits and Systems, appropriate subclasses for an electrical counter or register, per se.

Subclass: 112 [Patents]

Computer or processor control:
This subclass is indented under subclass 111. Subject matter wherein telephone usage determination is controlled by a digital signal processing calculating device.

Subclass: 113 [Patents]

Call traffic recording:
This subclass is indented under subclass 112. Subject matter where a computer or processor counts the number of calls.

SEE OR SEARCH THIS CLASS, SUBCLASS:
133 for telephone traffic recording not specifically
controlled by a computer or processor.

Subclass: 114 [Patents]

Call charge metering or monitoring:
This subclass is indented under subclass 111. Subject matter for a particular telephone set or the cost to a subscriber.

Subclass: 115 [Patents]

Interexchange operations:
This subclass is indented under subclass 114. Subject matter wherein the charge determination is made at one exchange and then transmitted to another related to the calling station.
(1) Note. Included herein is "CAMA" - Centralized Automatic Message Accounting where the accounting for several central exchanges is handled at only one office.

SEE OR SEARCH THIS CLASS, SUBCLASS:
219 for interexchange switching or signalling.

Subclass: 116 [Patents]

Hardcopy record generating:
This subclass is indented under subclass 115. Subject matter for producing a permanent record of the call charge or basis therefor.

Subclass: 117 [Patents]

Of station on polystation or party line:
This subclass is indented under subclass 114. Subject matter which determines a call charge of a terminal on a party line

SEE OR SEARCH THIS CLASS, SUBCLASS:
177 for a party line telephone system.

Subclass: 118 [Patents]

Identification of station:
This subclass is indented under subclass 117. Subject matter which determines to which station on a party line a call is charged.

SEE OR SEARCH THIS CLASS, SUBCLASS:
183 for party line station identification.

Subclass: 119 [Patents]

Hardcopy record generating (e.g., ticket printing):
This subclass is indented under subclass 114. Subject matter which produces a permanent record showing a numerical quantity indicating the call charge or basis therefor.

SEE OR SEARCH THIS CLASS, SUBCLASS:
116 for generating a hardcopy record at an exchange other than that to which the calling station is connecting.

Subclass: 120 [Patents]

With line identification or class of service determination:
This subclass is indented under subclass 119. Subject matter which ascertains the identity, or service entitlement, of a calling line.

Subclass: 121 [Patents]

At central office:
This subclass is indented under subclass 114. Subject matter wherein the determination is made at the central switching office to which the telephone set is connected.

Subclass: 122 [Patents]

With display:
This subclass is indented under subclass 121. Subject matter which produces an indication of the call charge or basis therefor.

Subclass: 123 [Patents]

Paystation (e.g., escrow control):
This subclass is indented under subclass 121. Subject matter for measuring the cost of a call from a paystation.

SEE OR SEARCH THIS CLASS, SUBCLASS:
143 for a paystation arrangement.

Subclass: 124 [Patents]

Pulse counting or accumulating (e.g., "message metering"):
This subclass is indented under subclass 121. Subject matter wherein the charge determination is made by accumulation of call connection timing pulses.

Subclass: 125 [Patents]

Local or zone:
This subclass is indented under subclass 124. Subject matter wherein the charge determination is made of calls within the local calling area.

Subclass: 126 [Patents]

Automatic message accounting:
This subclass is indented under subclass 124. Subject matter which records the data necessary to prepare an itemized bill for a subscriber.

Subclass: 127 [Patents]

Having line identification (e.g., automatic number identification-"ANI"):
This subclass is indented under subclass 126. Subject matter in which telephone message accounting equipment identifies the telephone number of the dialing station.

Subclass: 128 [Patents]

Time of day controlled:
This subclass is indented under subclass 124. Subject matter to count or accumulate timing pulses at different rates controlled in accordance with the time of day.

SEE OR SEARCH CLASS:
368, Horology: Time Measuring Systems and Devices, subclass 4 and 13 for time measurement controlled by, or combined with a telephone.

Subclass: 129 [Patents]

Manually set (e.g., key and lock):
This subclass is indented under subclass 121. Subject matter having a hand operated call charge metering device.

Subclass: 130 [Patents]

At subscriber station:
This subclass is indented under subclass 114. Subject matter wherein the determination is made at the location of the telephone set being monitored.

Subclass: 131 [Patents]

Time controlled:
This subclass is indented under subclass 130. Subject matter which modifies the call charge determination in accordance with time or elapsed duration.

Subclass: 132 [Patents]

Paystation (e.g., escrow control):
This subclass is indented under subclass 131. Subject matter for measuring the cost of a call from a paystation.

SEE OR SEARCH THIS CLASS, SUBCLASS:
143 for a paystation arrangement.

Subclass: 133 [Patents]

Call traffic recording or monitoring:
This subclass is indented under subclass 111. Subject matter for making a determination of the total number of calls, or the number of calls per unit time.

SEE OR SEARCH THIS CLASS, SUBCLASS:
34 for measuring the response time of telephone equipment.

Subclass: 134 [Patents]

At central station:
This subclass is indented under subclass 133. Subject matter wherein the determination is made at a switching station spaced remotely from the user terminal.

Subclass: 135 [Patents]

With hardcopy record generation (e.g., ticket printing):
This subclass is indented under subclass 134. Subject matter which produces a permanent record showing the number of calls utilizing the particular monitored telephone system element.

Subclass: 136 [Patents]

With display:
This subclass is indented under subclass 134. Subject matter for producing a visual indication of the number of calls.

Subclass: 137 [Patents]

Trunk usage (e.g., peg count):
This subclass is indented under subclass 134. Subject matter which ascertains the number of calls on a shared trunk line.

Subclass: 138 [Patents]

All trunks busy metering:
This subclass is indented under subclass 137. Subject matter which determines the duration during which all trunks monitored are in a busy condition.

Subclass: 139 [Patents]

Counting the number of completed connections:
This subclass is indented under subclass 134. Subject matter for incrementing a totalling device by one unit in response to a successful call attempt.

Subclass: 140 [Patents]

At subscriber:
This subclass is indented under subclass 133. Subject matter wherein the determination is made at the location of a telephone terminal set.

Subclass: 141 [Patents]

Mechanical register:
This subclass is indented under subclass 140. Subject matter wherein the traffic information is sorted in a mechanical register.

Subclass: 142 [Patents]

WITH CALLING NUMBER DISPLAY OR RECORDING AT CALLED SUBSTATION:
This subclass is indented under the class definition. Subject matter located at the called substation which provides either a visible indication, or a permanent or semi-permanent record, of the telephone number of a calling terminal.

SEE OR SEARCH THIS CLASS, SUBCLASS:
120 for calling number identification on a hardcopy call charge record.
264 for line identification at a central switching facility.

Subclass: 143 [Patents]

WITH CHECK OPERATED CONTROL (E.G., PAYSTATION):
This subclass is indented under the class definition. Subject matter wherein a telephone is operated by an authorized payment and includes telephone circuitry.

SEE OR SEARCH THIS CLASS, SUBCLASS:
36 for a paystation having provision for free calling.
123 for paystation charge metering at a central office.
132 for paystation charge metering at the terminal.

SEE OR SEARCH CLASS:
194, Check-Actuated Control Mechanisms, appropriate subclasses for a check controlled telephone mechanism, per se, or for a check controlled device of general utility.

Subclass: 144 [Patents]

Other than coin:
This subclass is indented under subclass 143. Subject matter wherein the telephone paystation accepts paper currency or a credit card.

Subclass: 145 [Patents]

Fraud or interference prevention:
This subclass is indented under subclass 143. Subject matter for mitigation of inaccurate or false indication of payment.

Subclass: 146 [Patents]

Coin signalling or control:
This subclass is indented under subclass 143. Subject matter having some detail of transmitting a signal, representative of the presence and denomination of a coin to, o0r controlling the disposition of a coin from, the central office.

Subclass: 147 [Patents]

Coin box audit or totalizer:
This subclass is indented under subclass 146. Subject matter where the amount or value of the coins in the coin box of the
pay station is signalled.

Subclass: 148 [Patents]

Denomination:
This subclass is indented under subclass 146. Subject matter which determines the value of a deposited coin.

Subclass: 149 [Patents]

Post-pay coin collection:
This subclass is indented under subclass 146. Subject matter which accepts deposit of the coin after the connection is made between the pay station and a called subscriber.
(1) Note. Two-way audio connection is often not established until deposit of the required payment.

SEE OR SEARCH THIS CLASS, SUBCLASS:
123 for a pay station in which metered services (e.g., long distance toll charges) are paid in advance.

Subclass: 150 [Patents]

Coin disposition (i.e., return or collection):
This subclass is indented under subclass 146. Subject matter which sends a deposited coin into one of a plurality of coin handling paths e.g., selectively collecting or refunding coin).

SEE OR SEARCH THIS CLASS, SUBCLASS:
123 for similar subject matter having escrow control.

SEE OR SEARCH CLASS:
194, Check-Actuated Control Mechanisms, appropriate subclasses for a coin return mechanism not combined with telephone circuitry.

Subclass: 151 [Patents]

Upon connection to called station:
This subclass is indented under subclass 150. Subject matter
wherein coin disposition is directly responsive to the successful call connection to a called party.

Subclass: 152 [Patents]

Magnet, electromagnet, or relay controlled from central office:
This subclass is indented under subclass 150. Subject matter wherein the paystation has a magnetic device controlled by a signal from a central switching station, the magnetic device in turn controlling the disposition of a deposited coin.

Subclass: 153 [Patents]

Paystation (e.g., controlled by refund key):
This subclass is indented under subclass 150. Subject matter wherein coin disposition is controlled by equipment at the paystation.

Subclass: 154 [Patents]

At central office:
This subclass is indented under subclass 143. Subject matter wherein the control function is performed at a switching station spaced remotely from the user terminal.

Subclass: 155 [Patents]

At terminal station (e.g., coin paystation):
This subclass is indented under subclass 143. Subject matter wherein the control is performed within or adjacent to the user terminal.

Subclass: 156 [Patents]

MULTI-LINE OR KEY SUBSTATION SYSTEM WITH SELECTIVE SWITCHING AND CENTRAL SWITCHING OFFICE CONNECTION:
This subclass is indented under the class definition. Subject matter including circuitry for allowing a subscriber terminal to be selectively connected to one of a plurality of lines, at least one of which is a public telephone line.
(1) Note. Each public telephone line is associated with a unique director number.
(2) Note. A PBX is a system connected to one of a plurality of shared usage lines (trunks) as opposed to lines associated with individual directory numbers; however, a key system may be associated with a PBX system.

Subclass: 157 [Patents]

With special service:
This subclass is indented under subclass 156. Subject matter providing for an additional service beyond normal telephone call signalling or connection (i.e., those not normally provided without additional fees).
(1) Note. Such services generally involve three or more stations or two or more call connections.

SEE OR SEARCH THIS CLASS, SUBCLASS:
201 for centralized switching with special services.

Subclass: 158 [Patents]

Conferencing:
This subclass is indented under subclass 157. Subject matter enabling three or more terminals to be included in a single call connection.

SEE OR SEARCH THIS CLASS, SUBCLASS:
202 for conferencing not limited to a key telephone system.

Subclass: 159 [Patents]

With intercom system:
This subclass is indented under subclass 156. Subject matter having a line which is not normally connected to the public telephone system.
(1) Note. These lines are often connected between terminals on the key-type system.

SEE OR SEARCH THIS CLASS, SUBCLASS:
167 for an intercom system, per se.

Subclass: 160 [Patents]

With connection of intercom station to subscriber line:
This subclass is indented under subclass 159. Subject matter including connecting an intercom instrument to a public telephone line.

Subclass: 161 [Patents]

With exclusion or priority feature (e.g., lockout or privacy):
This subclass is indented under subclass 156. Subject matter where use of one terminal on a particular line denies or cuts off access of another terminal to the line.

Subclass: 162 [Patents]

Detail of hold circuitry:
This subclass is indented under subclass 156. Subject matter including details of circuitry to allow an established telephone connection be maintained without the transmission or reception of audio signals.

SEE OR SEARCH THIS CLASS, SUBCLASS:
84 for dynamic reproduction of a recorded audio signal combined with line holding.
393 for line holding other than in a key system.

Subclass: 163 [Patents]

Electronic:
This subclass is indented under subclass 162. Subject matter having a discharge or solid state device.

Subclass: 164 [Patents]

Line status indication or call alerting:
This subclass is indented under subclass 156. Subject matter including circuitry to provide a perceptible indication of an incoming call or other status of one or more of the lines
connected to a terminal.

Subclass: 165 [Patents]

Switching or supervision feature (e.g., common control, digital):
This subclass is indented under subclass 156. Subject matter which provides for connection control or signalling within a telephone key system.

Subclass: 166 [Patents]

Detail of line circuit or line card:
This subclass is indented under subclass 156. Subject matter including a subscriber loop or line circuit or an interchangeable support therefor.
(1) Note. Included herein are circuit boards having features of the subscriber loop or line.

Subclass: 167 [Patents]

PRIVATE (E.G., HOUSE OR INTERCOM) OR SINGLE LINE SYSTEM:
This subclass is indented under the class definition. Subject matter having (a) a plurality of stations none of which is connected to the public telephone system, (b) two subsets connected by a single line.

Subclass: 168 [Patents]

Lockout:
This subclass is indented under subclass 167. Subject matter which blocks access to the system by stations other than those involved in a specific communication.

Subclass: 169 [Patents]

Central power source:
This subclass is indented under subclass 168. Subject matter having a single energy source for the entire system.

Subclass: 170 [Patents]

With paging:
This subclass is indented under subclass 167. Subject matter which produces a perceptible call notification signal intended for a specific individual.
(1) Note. This subclass includes an audible or other individualized signal for summoning an individual to a particular location.
(2) Note. The subject matter in this subclass excludes ringing or other nonindividualized call alerting signals.

Subclass: 171 [Patents]

Having plural stations with selective calling (e.g., master):
This subclass is indented under subclass 167. Subject matter having three or more station at least two of which have provision to direct a call to any other station.

Subclass: 172 [Patents]

With call addressing:
This subclass is indented under subclass 171. Subject matter in which an originating station generates a signal representing the called station which signal actuates equipment to cause the desired connection.

Subclass: 173 [Patents]

With call addressing:
This subclass is indented under subclass 167. Subject matter in which the originating station generates a signal representing the called station which signal actuates equipment to cause the desired connection.

Subclass: 174 [Patents]

Including body or apparel supported terminal (e.g., headgear):
This subclass is indented under subclass 167. Subject matter
in which a system has a voice terminal peculiarly adapted to be retained by a body portion or an article of clothing.

SEE OR SEARCH THIS CLASS, SUBCLASS:
430 for a body supported terminal.

Subclass: 175 [Patents]

For underwater use (e.g., in diver's suit):
This subclass is indented under subclass 174. Subject matter in which terminal is specifically adapted for operation by a submerged user.

SEE OR SEARCH CLASS:
367, Communications, Electrical: Acoustic Wave Systems and Devices, subclass 132 for an underwater speech communication system using acoustical waves in water as a portion of the transmission link.

Subclass: 176 [Patents]

With central power source:
This subclass is indented under subclass 167. Subject matter having a single electrical energy source for the entire system.

Subclass: 177 [Patents]

POLYSTATION LINE SYSTEM (I.E., PARTY LINE):
This subclass is indented under the class definition. Subject matter wherein the terminals of plural subscribers having different call addresses are connected to the central switching office by a single line.

SEE OR SEARCH CLASS:
178, Telegraphy, subclass 2 for party line telegraph systems.
340, Communications: Electrical, 825.38 for selective party line signalling.

Subclass: 178 [Patents]

Revertive call:
This subclass is indented under subclass 177. Subject matter which enables calling another party on the same line.

Subclass: 179 [Patents]

Call alerting (e.g., ringing):
This subclass is indented under subclass 177. Subject matter which directs a call alerting signal to a party line subscriber terminal.

SEE OR SEARCH THIS CLASS, SUBCLASS:
252 for call alerting.

Subclass: 180 [Patents]

Full selective or tuned (e.g., harmonic):
This subclass is indented under subclass 179. Subject matter which uniquely directs the ringing signal to a particular subscriber terminal.
(1) Note. The unique direction often uses frequency selection of the ringing signal.

Subclass: 181 [Patents]

Semi-selective (e.g., line side, polarized):
This subclass is indented under subclass 179. Subject matter wherein the ringing signal is directed to a subset of the terminals connected to the line.
(1) Note. The signal direction often uses control of the polarity of, or the side to which, the signal is directed.

Subclass: 182 [Patents]

Automatic or unattended:
This subclass is indented under subclass 177. Subject matter including a switching exchange for performing call connection solely in response to a call address signal.

Subclass: 183 [Patents]

Station identification:
This subclass is indented under subclass 182. Subject matter which further ascertains the identity of a calling station.

Subclass: 184 [Patents]

Lockout:
This subclass is indented under subclass 182. Subject matter for blocking access to a line already in use.

Subclass: 185 [Patents]

Portable or mobile:
This subclass is indented under subclass 177. Subject matter wherein a terminal is either mounted in a vehicle, or is of such size and configuration so as to be carried by an individual.

SEE OR SEARCH THIS CLASS, SUBCLASS:
55.1 for similar subject matter having a near field link.
56.1 for similar subject matter having a radio or an electromagnetic field link.

Subclass: 186 [Patents]

Central power source:
This subclass is indented under subclass 177. Subject matter having a common electrical energizing supply for the stations connected to a line.

Subclass: 187 [Patents]

Connected to central office:
This subclass is indented under subclass 177. Subject matter wherein a polystation line is connected to a central switching office.

Subclass: 188 [Patents]

CALL OR TERMINAL ACCESS ALARM OR CONTROL:
This subclass is indented under the class definition. Subject matter for restricting the calls that may be made from a particular station, or generating an alerting signal in response to a call or call attempt in violation of a call restriction.

Subclass: 189 [Patents]

Fraud or improper use mitigating or indication (e.g., "blue box", "black box"):
This subclass is indented under subclass 188. Subject matter to defeat or indicate an attempt to override the call range restriction without a proper authorization or control function.

Subclass: 190 [Patents]

Time out:
This subclass is indented under subclass 188. Subject matter which in response to a specified equipment status for a specified duration either changes the status, or generates an alerting signal.
(1) Note. This subclass would include disconnection of a terminal after a set time.

Subclass: 191 [Patents]

At switching center:
This subclass is indented under subclass 190. Subject matter wherein a status control or an alerting function is performed at a switching center remote from the terminal.

Subclass: 192 [Patents]

Of call duration (e.g., conversation timer):
This subclass is indented under subclass 191. Subject matter wherein a status control or an alerting function is performed when the duration of elapsed time during a call exceeds a predetermined length.

Subclass: 193 [Patents]

Of specific equipment:
This subclass is indented under subclass 191. Subject matter wherein the status of particular telephone system equipment is determined for the status control or alerting function.

Subclass: 194 [Patents]

Lockout or double use signalling:
This subclass is indented under subclass 188. Subject matter which locks access to, or indicates an attempt to access, the system by a station other than one previously in use.

SEE OR SEARCH THIS CLASS, SUBCLASS:
160 for this subject matter in a key telephone system.
168 for this subject matter in a private system.
184 for this subject matter in a party line system.

Subclass: 195 [Patents]

In automatic system:
This subclass is indented under subclass 194. Subject matter wherein the access prevention or attempt determination is made in an automatic switching system.

Subclass: 196 [Patents]

At switching center:
This subclass is indented under subclass 188. Subject matter wherein the call restriction function or generation of the alerting signal is performed at a switching station remote from a user terminal.

Subclass: 197 [Patents]

Central office:
This subclass is indented under subclass 196. Subject matter wherein the switching center is a central office.

Subclass: 198 [Patents]

PBX:
This subclass is indented under subclass 196. Subject matter wherein the switching center is a private branch exchange.

Subclass: 199 [Patents]

At substation:
This subclass is indented under subclass 188. Subject matter wherein the call or terminal restriction or alerting function is performed at a subscriber terminal.

Subclass: 200 [Patents]

Restrictive dialing circuit:
This subclass is indented under subclass 199. Subject matter wherein the call restriction limits the call address signals which may be generated.

Subclass: 201 [Patents]

SPECIAL SERVICES:
This subclass is indented under the class definition. Subject matter including a switching, connection, or control function additional to those necessary to establish and maintain a single call connection between two stations.
(1) Note. These services generally involve three or more stations or two or more call connections.
(2) Note. Examples of such special services are conferencing, abbreviated dialing, call forwarding or transfer, paging, call waiting, and special networks.

SEE OR SEARCH THIS CLASS, SUBCLASS:
157 for this subject matter in a key telephone system.

SEE OR SEARCH CLASS:
370, Multiplex Communications, 259 for such special services combined with multiplex switching.

Subclass: 202 [Patents]

Conferencing:
This subclass is indented under subclass 201. Subject matter which enables three or more terminals on distinct subscriber lines to be included in a single call connection.

SEE OR SEARCH THIS CLASS, SUBCLASS:
158 for conferencing involving a key-type substation system.

Subclass: 203 [Patents]

Operator control:
This subclass is indented under subclass 202. Subject matter wherein the conferencing connection is performed by an attendant at a central switching office.

Subclass: 204 [Patents]

Subscriber control:
This subclass is indented under subclass 202. Subject matter wherein the conferencing connection is established or modified by central office switching equipment in response to signalling from a subscriber terminal.

Subclass: 205 [Patents]

Conference initiation by single calling station:
This subclass is indented under subclass 204. Subject matter wherein a signalling function is performed at the calling terminal to originate the conference call.

Subclass: 206 [Patents]

At substation:
This subclass is indented under subclass 202. Subject matter wherein the conference call line coupling or switching is performed at a subscriber station.
(1) Note. Included herein are plural line conferencing and audio conferencing.

SEE OR SEARCH THIS CLASS, SUBCLASS:
158 for a key telephone system having a conferencing circuit.

Subclass: 207 [Patents]

At plural exchanges:
This subclass is indented under subclass 201. Subject matter providing a modification of normal telephone call signalling or connection between different exchanges.

SEE OR SEARCH THIS CLASS, SUBCLASS:
219 for plural exchange networks or signalling.

Subclass: 208 [Patents]

Priority override (e.g., butt-in):
This subclass is indented under subclass 201. Subject matter allowing a designated type of call to interrupt another telephone conversation.

SEE OR SEARCH THIS CLASS, SUBCLASS:
215 for call interruption or signalling therefor by any additional incoming call.
218 for call interruption performed by an operator.

Subclass: 209 [Patents]

Repetitive call attempts (e.g., camp-on-busy, retry):
This subclass is indented under subclass 201. Subject matter which includes producing successive repeated call attempts.

Subclass: 210 [Patents]

Call diversion (e.g., call capture):
This subclass is indented under subclass 201. Subject matter for directing a call connection from an addressed telephone station to another.
(1) Note. The changed connection may be either the calling
or the called station.

Subclass: 211 [Patents]

Call forwarding:
This subclass is indented under subclass 210. Subject matter for rerouting an incoming call from an intended addressed station to another desired station without completion of the call connection to the addressed station.

Subclass: 212 [Patents]

Call transfer:
This subclass is indented under subclass 210. Subject matter for changing a completed call connection to an addressed station to another station after completion of call connection to the addressed station.

Subclass: 213 [Patents]

Intercept (e.g., dead or changed number):
This subclass is indented under subclass 210. Subject matter wherein a call made to one of a specified group of addresses is directed to a predetermined location.

Subclass: 214 [Patents]

Secretarial or answering service:
This subclass is indented under subclass 210. Subject matter for call completion to an alternative station upon a designated condition.
(1) Note. The designated condition may include: time, no answer for specified interval, or request.

Subclass: 215 [Patents]

Call waiting:
This subclass is indented under subclass 201. Subject matter for signalling a first station in communication with a second station that a third station desires communication with the first station.
(1) Note. The first station can usually communicate alternatively with the second and third stations.

Subclass: 216 [Patents]

Abbreviated dialing or direct call (e.g., hot line):
This subclass is indented under subclass 201. Subject matter responsive to either a service request condition or, to a line signal code of less than the complete call address signal, for completing the call address connection in the same manner as if the full call address signal were received.
(1) Note. The term "service request condition" is generally an off-hook condition.

SEE OR SEARCH THIS CLASS, SUBCLASS:
355 for abbreviated call signal generation.

Subclass: 217 [Patents]

Audible paging:
This subclass is indented under subclass 201. Subject matter which connects a telephone circuit to a loudspeaker system for summoning an individual.

SEE OR SEARCH CLASS:
340, Communications: Electrical, subclass 311.1 for a paging system.
381, Electrical Audio Signal Processing Systems and Devices, subclass 75 for a megaphone and subclass 82 for a public address system.

Subclass: 218 [Patents]

Performed by operator (e.g., butt-in, busy verification):
This subclass is indented under subclass 201. Subject matter wherein the special service is performed by an attendant at a central or branch switching station.

SEE OR SEARCH THIS CLASS, SUBCLASS:
48 for telephone alarm butt-in equipment.

Subclass: 219 [Patents]

PLURAL EXCHANGE NETWORK OR INTERCONNECTION:
This subclass is indented under the class definition. Subject matter including a system having more than one exchange (e.g, switching office), or a circuit connection therebetween.
(1) Note. A branch exchange (e.g., PBX, PABX, etc.) is considered to be a separate switching office for purposes of this and its indented subclasses.

SEE OR SEARCH THIS CLASS, SUBCLASS:
242 for single exchange and generic centralized switching.

Subclass: 220 [Patents]

With interexchange network routing:
This subclass is indented under subclass 219. Subject matter for selecting one of plural paths for a call switched between two or more exchanges.

Subclass: 221 [Patents]

Alternate routing:
This subclass is indented under subclass 220. Subject matter for selecting a different path in response to a blockage or other failure to connect.

SEE OR SEARCH THIS CLASS, SUBCLASS:
273 for alternate routing within a single exchange.

Subclass: 222 [Patents]

Toll center:
This subclass is indented under subclass 219. Subject matter including a switching center for switching toll calls from other exchanges.

Subclass: 223 [Patents]

With operator assistance:
This subclass is indented under subclass 222. Subject matter where the toll center has an operator to assist in completion of toll calls.

Subclass: 224 [Patents]

Tandem switching center:
This subclass is indented under subclass 219. Subject matter having a switching center or office located intermediate between an originating and receiving switching office for switching the trunks connected to such offices.

Subclass: 225 [Patents]

Multi-PBX interconnection:
This subclass is indented under subclass 219. Subject matter which connects a plurality of private branch exchanges by shared trunks therebetween.

Subclass: 226 [Patents]

Having a manual exchange:
This subclass is indented under subclass 219. Subject matter wherein at least one of the plural exchanges has manual call connection.

Subclass: 227 [Patents]

With an automatic exchange:
This subclass is indented under subclass 226. Subject matter further including an exchange which switches calls in response to a call address signal.

Subclass: 228 [Patents]

Having signalling to operator:
This subclass is indented under subclass 227. Subject matter which causes an indication at an operator position at a remote switching office.

Subclass: 229 [Patents]

Interexchange signalling:
This subclass is indented under subclass 219. Subject matter including transmission of control or supervisory signals between exchanges.

Subclass: 230 [Patents]

Signalling path distinct from trunk (e.g., CCIS):
This subclass is indented under subclass 229. Subject matter wherein the control or supervisory signals for a group of trunks are multiplexed and transmitted over a single separate communication channel.

Subclass: 231 [Patents]

Central office-to-PBX signalling:
This subclass is indented under subclass 231. Subject matter including transmission of control or supervisory signals from a central office to a private branch exchange.

Subclass: 232 [Patents]

PBX trunk groups:
This subclass is indented under subclass 231. Subject matter including a plurality of shared trunk lines connecting the central office and the private branch exchange.

Subclass: 233 [Patents]

Direct inward dialing:
This subclass is indented under subclass 231. Subject matter wherein a call address designating a terminal connected to a private branch exchange will control connection to such a terminal.

Subclass: 234 [Patents]

PBX to central office signalling (e.g., direct outward
dialing):
This subclass is indented under subclass 229. Subject matter which transmits control or supervisory signal from a private branch exchange to a central switching exchange.

Subclass: 235 [Patents]

Voice frequency signalling over trunk:
This subclass is indented under subclass 229. Subject matter wherein control or supervisory signals are transmitted as tones within the audible frequency range.

Subclass: 236 [Patents]

D.C. signalling over trunk:
This subclass is indented under subclass 229. Subject matter wherein the control or supervisory signal is represented by the presence or polarity of the current or voltage in a particular circuit.

Subclass: 237 [Patents]

Pulse or digital signalling:
This subclass is indented under subclass 236. Subject matter wherein the control or supervisory signals are represented by the time pattern of abrupt variations in a specified signal.

Subclass: 238 [Patents]

Having signalling repeater:
This subclass is indented under subclass 237. Subject matter including amplification of interexchange pulse or digital signals.

SEE OR SEARCH THIS CLASS, SUBCLASS:
341 for a telephone pulse signalling repeaters, per se.

Subclass: 239 [Patents]

Using register-sender:
This subclass is indented under subclass 237. Subject matter including storage and subsequent retransmission of pulse or digital interexchange signalling information.

SEE OR SEARCH THIS CLASS, SUBCLASS:
288 for a centralized switching register-sender.

Subclass: 240 [Patents]

Interexchange trunk circuit:
This subclass is indented under subclass 229. Subject matter including trunk circuit switching.

SEE OR SEARCH THIS CLASS, SUBCLASS:
333 for subscriber line and trunk switching.

Subclass: 241 [Patents]

Glare or simultaneous seizure mitigation:
This subclass is indented under subclass 240. Subject matter for prevention of call blocking caused by seizing of a trunk at both ends thereof.

Subclass: 242 [Patents]

CENTRALIZED SWITCHING SYSTEM:
This subclass is indented under the class definition. Subject matter which selectively connects two telephone subscriber lines for communication.
(1) Note. This subclass includes a single telephone office and generic telephone switching.

SEE OR SEARCH THIS CLASS, SUBCLASS:
219 for a plural exchange network.

SEE OR SEARCH CLASS:
711, Electrical Computers and Digital Processing Systems: Memory, 1 for addressing combined with specific memory configurations (e.g., extended, expanded, dynamic, etc.) in a digital data processing system, subclasses 100+ for generalized address forming in a digital data processing system, and subclasses 200+ for generalized storage accessing and control in a digital data processing system.

Subclass: 243 [Patents]

Class of service determination or transmission:
This subclass is indented under subclass 242. Subject matter to identify or supply a designation related to different types or levels of service applicable to calling station.

Subclass: 244 [Patents]

In common control system:
This subclass is indented under subclass 243. Subject matter which supplies a type of service designation in stored number switching equipment.

Subclass: 245 [Patents]

Identification:
This subclass is indented under subclass 242. Subject matter at a central switching office for determining which telephone system component is used in a particular call.

Subclass: 246 [Patents]

Of line or trunk:
This subclass is indented under subclass 245. Subject matter wherein the identified component is a telephone signal conductor unique to a terminal station or concentrator.

Subclass: 247 [Patents]

With display:
This subclass is indented under subclass 246. Subject matter for providing a visual indication of the line or trunk used.

SEE OR SEARCH THIS CLASS, SUBCLASS:
142 for a calling number display at a called substation.

Subclass: 248 [Patents]

Using matrix:
This subclass is indented under subclass 246. Subject matter including an array of elements to determine the line or trunk identity.

SEE OR SEARCH CLASS:
340, Communications: Electrical, 825.79 for a selective matrix.

Subclass: 249 [Patents]

For nuisance call mitigation:
This subclass is indented under subclass 246. Subject matter for identifying a calling station which is a source of undesired, annoying, or abusive calls.

Subclass: 250 [Patents]

Four-wire switching:
This subclass is indented under subclass 242. Subject matter for connecting two lines, each of which has a physically separate pair for each direction of transmission.

Subclass: 251 [Patents]

With generating of call associated substation signal:
This subclass is indented under subclass 242. Subject matter which generates and transmits a signal to a substation which indicates the presence of, or result of, a call attempt.

SEE OR SEARCH THIS CLASS, SUBCLASS:
315 for signalling to an operator at a switching facility.
372 for line signalling received at substation.
418 for call signal generating, per se.

Subclass: 252 [Patents]

For alerting signal at called station (e.g., ringing):
This subclass is indented under subclass 251. Subject matter
where the signal is a humanly perceptible signal at the called terminal.

Subclass: 253 [Patents]

Electronic:
This subclass is indented under subclass 252. Subject matter having an electric circuit element utilizing an electron discharge device or semiconductor component.

Subclass: 254 [Patents]

Associated with connector:
This subclass is indented under subclass 252. Subject matter wherein the call signal generating device is associated with a particular final stage selecting device.

Subclass: 255 [Patents]

With interrupter:
This subclass is indented under subclass 252. Subject matter having timing equipment which periodically blocks the alerting signal.

Subclass: 256 [Patents]

Having automatic or through ringing:
This subclass is indented under subclass 251. Subject matter which generates a call alerting signal in response to a connection being made to a line by the operator, or which enables an operator to by-pass another operator position for subscriber signalling.

Subclass: 257 [Patents]

For calling station (e.g., status or progress tones):
This subclass is indented under subclass 251. Subject matter where a line condition responsive or call associated signal is transmitted back to the calling terminal.
(1) Note. Included herein are tones indicating the condition or result of a call attempt.

Subclass: 258 [Patents]

Switching controlled in response to called station addressing signal:
This subclass is indented under subclass 242. Subject matter including ccontrol of line interconnection in response to a call address signal.
(1) Note. The call address signal is a selectively signal which specifies the identity of the particular line or terminal with which communication is desired.

SEE OR SEARCH THIS CLASS, SUBCLASS:
18 for testing of automatic switching arrangement by use of a call address signal.
111 for usage measurement.
173 for an intercom with call addressing.
201 for identification of a station address.

SEE OR SEARCH CLASS:
335, Electricity: Magnetically Operated Switches, Magnets, and Electromagnets, 105 for an automatic telephone switch, per se.
340, Communications: Electrical, 825 for a signal controlled switching system, not limited to telephone switching.

Subclass: 259 [Patents]

Including deflected electron beam switching device or mechanical or optical switching control (e.g., fluidic):
This subclass is indented under subclass 258. Subject matter in which a supervisory or control signal controls the operation of (a) electron beam deflecting equipment, (b) a light modifying element, or (c) a mechanical force or flow modifying element, so as to cause a change in a detected pattern of the deflected to modified quantity, which in turn controls a call connection.
(1) Note. The supervisory or control signal is often a call address signal.
(2) Note. Such control often utilizes optical, fluidic, or mechanical logic.

Subclass: 260 [Patents]

With operator position or completion of call (e.g., dial "0", semi-automatic):
This subclass is indented under subclass 258. Subject matter where intervention by a human operator is necessary in order to complete at least some telephone calls.
(1) Note. There must be a called station addressing signal (e.g., dial pulses) included in order to classified here.
(2) Note. Some examples of semi-automatic systems are: Operator dialed calls and calls dialed at a terminal which cause a visible indication of the called station's number at a manual operator's position.

SEE OR SEARCH THIS CLASS, SUBCLASS:
308 through 332, for centralized switching systems having human operators without a called station signal.

Subclass: 261 [Patents]

Operator controlled register-sender:
This subclass is indented under subclass 260. Subject matter wherein a register-sender is located at an operator attended switchboard for manual actuation.

SEE OR SEARCH THIS CLASS, SUBCLASS:
239 for a plural exchange network with a register-sender.
288 for common control central switching with a register-sender.

Subclass: 262 [Patents]

Call extension by operator:
This subclass is indented under subclass 260. Subject matter where the operator dials the called station address.

Subclass: 263 [Patents]

With call indicator or announcer:
This subclass is indented under subclass 262. Subject matter having means to provide the operator with a visual or sound indication of a desired called station address.

Subclass: 264 [Patents]

A to B operator:
This subclass is indented under subclass 262. Subject matter in which a call is extended from an operator answering the calling station to another operator who completes the connection to the called station.

Subclass: 265 [Patents]

Call distribution to operator:
This subclass is indented under subclass 260. Subject matter for selecting and connecting a calling terminal to an operator.

Subclass: 266 [Patents]

Call queuing:
This subclass is indented under subclass 265. Subject matter which processes a plurality of simultaneous call attempts to a lesser number of operators by holding each of the calls in excess of the number of operators until an operator is available.

SEE OR SEARCH THIS CLASS, SUBCLASS:
309 for call distribution or queuing to an operator absent called number controlled switching.

Subclass: 267 [Patents]

Operator's console:
This subclass is indented under subclass 260. Subject matter having details of the equipment used by the operator.

Subclass: 268 [Patents]

Having shared or common switching control:
This subclass is indented under subclass 258. Subject matter having a device which stores the call address signal and equipment for controlling switching in response to the stored signal.
(1) Note. This and indented subclasses include equipment for code conversion of the call address signal.

Subclass: 269 [Patents]

Distributed control:
This subclass is indented under subclass 268. Subject matter including plural switching stages and having several address signal storage means each providing control based on switching stage, level, or function.

Subclass: 270 [Patents]

In-stage or interstage scanning (e.g., link scanning):
This subclass is indented under subclass 268. Subject matter which sequentially provides connection between a plurality of link between or within plural switching stages.

Subclass: 271 [Patents]

Having multistage switching:
This subclass is indented under subclass 268. Subject matter wherein the switching is performed by plural interconnected and interactive switching stage.

Subclass: 272 [Patents]

Path selection or routing:
This subclass is indented under subclass 271. Subject matter which determines a path configuration through plural switching stage.

SEE OR SEARCH CLASS:
340, Communications: Electrical, 826 for channel selection through a plural stage switching matrix.

Subclass: 273 [Patents]

Alternate routing:
This subclass is indented under subclass 272. Subject matter which modifies the path configuration in response to a blockage of a previous chosen configuration.

SEE OR SEARCH THIS CLASS, SUBCLASS:
221 for alternate routing in interexchange network routing.

SEE OR SEARCH CLASS:
340, Communications: Electrical, subclass 827 for alternate routing channel selecting switching not limited to telephone equipment.

Subclass: 274 [Patents]

With busy or idle test:
This subclass is indented under subclass 273. Subject matter which determine whether or not a component desired for use is already in use.

SEE OR SEARCH THIS CLASS, SUBCLASS:
277 297 and 381, for busy or idle testing of a telephone system component other than in alternate routing multistage common control.

Subclass: 275 [Patents]

Including marking circuit:
This subclass is indented under subclass 272. Subject matter which includes placing a potential on a lead or contact of a path selecting multistage switching device and a hunting circuit for making a connection to the lead or contact in response to the potential thereon.

Subclass: 276 [Patents]

End-to-end marking (e.g., self-seeking):
This subclass is indented under subclass 275. Subject matter which includes placing a marking potential at both ends of the switching path.

Subclass: 277 [Patents]

With busy or idle test:
This subclass is indented under subclass 272. Subject matter which determines whether a line or a switching element is in use.

SEE OR SEARCH THIS CLASS, SUBCLASS:
274 for busy or idle testing of a telephone system component in alternate routing multistage common control equipment.
297 337 and 381, for busy or idle testing of a telephone system component other than in multistage common control equipment.

Subclass: 278 [Patents]

Interstage junctor or "trunk":
This subclass is indented under subclass 271. Subject matter including a circuit connecting the stages of multistage switching equipment.

Subclass: 279 [Patents]

Control reliability (e.g., redundancy):
This subclass is indented under subclass 268. Subject matter with switching control in accordance with the reliability of the control components.

SEE OR SEARCH CLASS:
714, Error Detection/Correction and Fault Detection/Recovery, 820 for redundancy in a signal transmission facility or channel not limited to telephone equipment.

Subclass: 280 [Patents]

Including registering or storing device for call address signal:
This subclass is indented under subclass 268. Subject matter which includes a specific detail of a call address signal storage device.

SEE OR SEARCH CLASS:
377, Electrical Pulse Counters, Pulse Dividers, or Shift
Registers; Circuit and Systems, appropriate subclasses for a register circuit, per se.
711, Electrical Computers and Digital Processing Systems: Memory, 1 for addressing combined with specific memory configurations (e.g., extended, expanded, dynamic, etc.) and subclasses 101+ for storage accessing and control of specific memory compositions in a digital data processing system.

Subclass: 281 [Patents]

Conversion between dial pulse and voice frequency signal:
This subclass is indented under subclass 280. Subject matter which changes the call address signal between a pattern of abrupt variation in a DC signal such as pulses and corresponding tone frequencies and variations thereof.

SEE OR SEARCH THIS CLASS, SUBCLASS:
339 for signal conversion in a telephone repeater.

Subclass: 282 [Patents]

Voice frequency receiver:
This subclass is indented under subclass 280. Subject matter which is selectively responsive to audio frequency signalling tones.

Subclass: 283 [Patents]

Dual tone multifrequency (DTMF) receiver:
This subclass is indented under subclass 282. Subject matter in which the voice frequency receiver is responsive to the simultaneous occurrence of designated frequency pairs.

Subclass: 284 [Patents]

With processor:
This subclass is indented under subclass 280. Subject matter which controls switching functions in accordance with instructions stored in memory.

SEE OR SEARCH CLASS:
395, Information Processing System Organization, for digital
data processing systems, per se; 200.3 for data transferring among multiple computer systems; and subclasses 311+ for intrasystem switching control.
709, Electrical Computers and Digital Data Processing Systems: Multiple Computer or Process Coordinating, 200 for data transferring among multiple computer and digital processing systems.

Subclass: 285 [Patents]

With magnetic memory:
This subclass is indented under subclass 280. Subject matter having a magnetizable element for signal storage.

Subclass: 286 [Patents]

Signal processing (e.g., dial pulse analysis):
This subclass is indented under subclass 280. Subject matter wherein the call signal storage device or associated circuitry modifies the call address signal.

Subclass: 287 [Patents]

Electronic:
This subclass is indented under subclass 280. Subject matter in which the call address storage device includes an electron discharge device or a semiconductor component.

Subclass: 288 [Patents]

Register-sender:
This subclass is indented under subclass 280. Subject matter including storage and subsequent transmission of received call address signal.

SEE OR SEARCH THIS CLASS, SUBCLASS:
239 for plural exchange signalling using a register-sender.

Subclass: 289 [Patents]

Translator:
This subclass is indented under subclass 268. Subject matter which changes an electrical signal appearing in one code representation of the same information.

SEE OR SEARCH CLASS:
341, Coded Data Generation or Conversion, appropriate subclasses for code converting devices.

Subclass: 290 [Patents]

With time division of control or supervisory signals:
This subclass is indented under subclass 268. Subject matter including a communication channel for control or monitoring signals corresponding to one of a plurality of distinct speech channels and in which access to the communication channel is divided into discrete time intervals, each of such intervals corresponding to one of the speech channels and which are switched so rapidly as to give the effect of simultaneous transmission of all of the control or indicating signals.
(1) Note. Placement in this subclass is limited to those systems in which only the control or supervisory signals are multiplex. Systems in which the voice signals are also multiplexed are found in Class 370.

SEE OR SEARCH CLASS:
370, Multiplex Communications, appropriate subclasses for multiplexing of message signals.

Subclass: 291 [Patents]

With detail of crosspoint switching structure (e.g., crossbar):
This subclass is indented under subclass 268. Subject matter particularly describing a feature of selection equipment for an element of a switching array.

SEE OR SEARCH THIS CLASS, SUBCLASS:
306 for crosspoint switch detail in other than common control equipment.

SEE OR SEARCH CLASS:
335, Electricity: Magnetically Operated Switches, Magnets, and Electromagnets, subclass 112 for a telephone crossbar switch, per se.
340, Communications: Electrical, subclass 825.79 for details of switching arrays or matrices, not elsewhere classifiable.

Subclass: 292 [Patents]

Electronic crosspoint (e.g., solid-state):
This subclass is indented under subclass 291. Subject matter wherein the switching element includes an electron discharge device or a semiconductor component.

SEE OR SEARCH THIS CLASS, SUBCLASS:
287 for common control switching with registering or storing a call address signal and having an electronic component.

Subclass: 293 [Patents]

Having line finder:
This subclass is indented under subclass 258. Subject matter for locating and connecting a calling line to switching apparatus.

SEE OR SEARCH THIS CLASS, SUBCLASS:
377 for an off-hook detector, per se.

Subclass: 294 [Patents]

Including electronic element (e.g., tube or semiconductor):
This subclass is indented under subclass 293. Subject matter including an electron discharge device or semiconductor component.

SEE OR SEARCH THIS CLASS, SUBCLASS:
287 and 292, for electronic elements in other telephone switching systems.

Subclass: 295 [Patents]

Plural:
This subclass is indented under subclass 293. Subject matter including multiple line finders.

Subclass: 296 [Patents]

With repeater:
This subclass is indented under subclass 258. Subject matter having means which receives, amplifies and retransmits a signal.

SEE OR SEARCH THIS CLASS, SUBCLASS:
238 for interexchange signalling having a repeater.
338 for a telephone repeater, per se.

Subclass: 297 [Patents]

Having specified busy-idle test:
This subclass is indented under subclass 258. Subject matter including equipment to determine whether or not a component desired for use is already in use.

SEE OR SEARCH THIS CLASS, SUBCLASS:
274 277, 337, and 381, for busy-idle testing in specific equipment.

Subclass: 298 [Patents]

Direct control:
This subclass is indented under subclass 258. Subject matter wherein successive switching devices for making the call connection are directly responsive to the calls address pulse signal transmitted from the calling station.

Subclass: 299 [Patents]

Step-by-step system:
This subclass is indented under subclass 298. Subject matter having a plurality of switching stages working sequentially and independently of the state of subsequent stages.

Subclass: 300 [Patents]

Having plural wiper sets:
This subclass is indented under subclass 299. Subject matter having multiple rotary movable circuit contact elements.

Subclass: 301 [Patents]

Having potential control:
This subclass is indented under subclass 299. Subject matter which establishes or maintains electrical potential at some part of the switching system.

Subclass: 302 [Patents]

Having rotary switch:
This subclass is indented under subclass 299. Subject matter including a movable circuit completing device, which has rotational motion.

Subclass: 303 [Patents]

Coordinate system (e.g., X-Y):
This subclass is indented under subclass 299. Subject matter having a movable circuit completing element, the motion of which has two perpendicular components.

SEE OR SEARCH THIS CLASS, SUBCLASS:
302 for a step-by-step coordinate system where one of the components is angle of rotation.

Subclass: 304 [Patents]

All relay type:
This subclass is indented under subclass 298. Subject matter in which all switching is performed by electromagnetically controlled contact apparatus.

SEE OR SEARCH CLASS:
340, Communications: Electrical, subclass 825.79 for a relay matrix.
361, Electricity: Electrical Systems and Devices, 139 for a relay control circuit.

Subclass: 305 [Patents]

Having motor-driven switch:
This subclass is indented under subclass 298. Subject matter having a switching element driven by a motor.

SEE OR SEARCH THIS CLASS, SUBCLASS:
302 for a similar subject matter in a step-by-step system.

Subclass: 306 [Patents]

With crosspoint switch detail:
This subclass is indented under subclass 258. Subject matter having a detail or a switching element of a rectangular switch array.

SEE OR SEARCH THIS CLASS, SUBCLASS:
291 for common control crosspoint switch detail.

SEE OR SEARCH CLASS:
335, Electricity: Magnetically Operated Switches, Magnets, and Electromagnets, subclass 112 for a telephone crossbar switch, per se.
340, Communications: Electrical, subclass 825.79 for details of switching arrays or matrices, not elsewhere classifiable.

Subclass: 307 [Patents]

With power supply:
This subclass is indented under subclass 258. Subject matter which provides electric power to at least part of the telephone equipment being used.

SEE OR SEARCH THIS CLASS, SUBCLASS:
322 for a power supply in centralized switching.

Subclass: 308 [Patents]

Switching apparatus for connecting calling line to operator's
position:
This subclass is indented under subclass 242. Subject matter which connects a terminal to an operator's position in response to the presence of a call.

Subclass: 309 [Patents]

Call distribution or queuing:
This subclass is indented under subclass 308. Subject matter with circuitry for handling a plurality of calls at the same time to a lesser number of operator's positions.

SEE OR SEARCH THIS CLASS, SUBCLASS:
266 for call queuing to an operator an automatic or semiautomatic system.

Subclass: 310 [Patents]

Divided central (e.g., communication between switchboards):
This subclass is indented under subclass 242. Subject matter in which subscriber lines are grouped upon separate switchboards at a switching exchange.

SEE OR SEARCH THIS CLASS, SUBCLASS:
219 for interexchange signalling.
264 for call extension from an A operator to a B operator.

Subclass: 311 [Patents]

Having signalling path feature:
This subclass is indented under subclass 310. Subject matter having signalling conductors connecting a plurality of the switchboards for signalling between any two switchboards.

Subclass: 312 [Patents]

Having multiple answering jacks for multiplied line:
This subclass is indented under subclass 242. Subject matter including plural jack connectors for a line on different switchboards of a switching exchange.
(1) Note. The plural line appearances enable a call to be handled by operators at different switchboards.

Subclass: 313 [Patents]

Multiple section switchboard:
This subclass is indented under subclass 242. Subject matter having a switchboard with plural sections, each section having a separate jack connector for each subscriber.

Subclass: 314 [Patents]

Auxiliary (e.g., overflow):
This subclass is indented under subclass 313. Subject matter in which a switchboard has an additional section which is used primarily when the capacity of the other sections is exceeded.

Subclass: 315 [Patents]

With line-signal control:
This subclass is indented under subclass 242. Subject matter having a switchboard with a line condition responsive indicator and controlled in response to an operator's action on the call connection.

SEE OR SEARCH THIS CLASS, SUBCLASS:
350 for telephone line signalling.

Subclass: 316 [Patents]

Spring-jack cut-off:
This subclass is indented under subclass 315. Subject matter wherein the switchboard has a jack containing resilient contact elements which contact elements are disconnected by insertion of plug into the jack and which insertion stops the operation of the indicating signal.

Subclass: 317 [Patents]

Relay cut-off:
This subclass is indented under subclass 315. Subject matter wherein the line signal operation is stopped by a relay in response to insertion of a plug into a switchboard jack.

Subclass: 318 [Patents]

Central power source:
This subclass is indented under subclass 315. Subject matter including a common, centrally located, power supply for signalling, talking, or both.

SEE OR SEARCH THIS CLASS, SUBCLASS:
322 for power supplies in centralized switching systems.

Subclass: 319 [Patents]

Single switchboard (e.g, cord circuit):
This subclass is indented under subclass 242. Subject matter including structure or circuitry of a manual line switching apparatus actuated by a single operator.

Subclass: 320 [Patents]

Switchboard circuit:
This subclass is indented under subclass 319. Subject matter including a detail of the switchboard circuitry.

Subclass: 321 [Patents]

Connection to operator's terminal:
This subclass is indented under subclass 320. Subject matter including a detail of a connection between the switchboard and the operator's telephone set.

Subclass: 322 [Patents]

Power supply:
This subclass is indented under subclass 242. Subject matter which supplies electricity to a telephone system component.

Subclass: 323 [Patents]

Power to switching equipment:
This subclass is indented under subclass 322. Subject matter which supplies electricity to the centralized switching equipment.

Subclass: 324 [Patents]

Central power source (e.g., common battery, line current feed):
This subclass is indented under subclass 322. Subject matter where a single power supply provides electricity for a plurality of branches connected to the central switching equipment.

SEE OR SEARCH THIS CLASS, SUBCLASS:
318 for line signal control with a central power source.

Subclass: 325 [Patents]

Structure of equipment:
This subclass is indented under subclass 242. Subject matter directed to the physical configuration of the switching system.

Subclass: 326 [Patents]

Wire or cable distribution:
This subclass is indented under subclass 325. Subject matter including the structure of conductors in central switching equipment.

Subclass: 327 [Patents]

Main or intermediate distribution frame:
This subclass is indented under subclass 326. Subject matter having a structure for holding the wires or cables.

Subclass: 328 [Patents]

Equipment mounting or support:
This subclass is indented under subclass 325. Subject matter which retains the equipment at a given location against the force of gravity.

Subclass: 329 [Patents]

Allowing movement of equipment (e.g., movable, modular):
This subclass is indented under subclass 328. Subject matter permitting relative motion between the mounting or support and the equipment.

Subclass: 330 [Patents]

Housing:
This subclass is indented under subclass 325. Subject matter including a cover for a part of the equipment.

Subclass: 331 [Patents]

Having protective circuit:
This subclass is indented under subclass 242. Subject matter which prevents damage to the circuits of the central switching system from improper conditions.

Subclass: 332 [Patents]

Plug and socket:
This subclass is indented under subclass 242. Subject matter in which part of the equipment is inserted to a cooperating connector in another part of the equipment.

Subclass: 333 [Patents]

CONCENTRATOR OR TRUNK SELECTOR:
This subclass is indented under the class definition. Subject matter for connecting a large number of subscriber lines to a smaller number of shared or trunk lines.
(1) Note. The subscriber lines are only connected
alternatively to the shared or trunk lines; for simultaneous transmission see Class 370, Multiplex Communications.

Subclass: 334 [Patents]

Concentrator-distributor pair (e.g., line concentrator):
This subclass is indented under subclass 333. Subject matter having two similar complementary contractors to permit a large number of subscriber lines to be connected and supervised over a small number of trunk lines connecting the two complementary concentrators.

Subclass: 335 [Patents]

Using crossbar or crosspoint switching:
This subclass is indented under subclass 333. Subject matter wherein the connection is performed either by a rectangular switch array or a selective plural stage switch having plural horizontal and vertical contact paths.

SEE OR SEARCH THIS CLASS, SUBCLASS:
291 for crosspoint switching structure in a common control system.
306 for crosspoint switch detail in a centralized switching system.

Subclass: 336 [Patents]

With magnet, electromagnet, or relay:
This subclass is indented under subclass 333. subject matter wherein the concentrator includes either (a) an electrically excited, or a permanent, source of magnetic polarization, or (b) a magnetically operated switch.

Subclass: 337 [Patents]

With busy-idle test (e.g., idle trunk finder):
This subclass is indented under subclass 333. Subject matter which determines if a trunk is in use and controls the switching in response to a determination of nonuse.

SEE OR SEARCH THIS CLASS, SUBCLASS:
274 277, 297, and 381, for busy or idle testing.

Subclass: 338 [Patents]

REPEATER (E.G., VOICE FREQUENCY):
This subclass is indented under the class definition. Subject matter which receives and retransmits a signal which is amplified or processed in a telephone system.
(1) Note. This subclass excludes amplifiers in terminal sets, particularly of the hands-free type.

SEE OR SEARCH THIS CLASS, SUBCLASS:
4 for testing of a repeater.
146 for a coin signal repeater.
238 for a interexchange signalling repeater.
296 for an automatic centralized switching system with a repeater.
420 for a hands-free terminal.
432 for terminal having an amplifier.

SEE OR SEARCH CLASS:
330, Amplifiers, appropriate subclasses for an amplifier.
381, Electrical Audio Signal Processing Systems and Devices, appropriate subclasses for an amplifier in an electrical audio system.

Subclass: 339 [Patents]

With signal conversion (e.g., dial to DTMF, analog to PCM):
This subclass is indented under subclass 338. Subject matter which coverts a signal from variations in one parameter to variations of another.
(1) Note. an example such variations conversion is from that of abrupt variations in a DC signal such as pulses to variations of tone frequency.

SEE OR SEARCH THIS CLASS, SUBCLASS:
281 for signal conversion in a common control system.
353 for control line signalling.

Subclass: 340 [Patents]

Having line length compensation or equalization:
This subclass is indented under subclass 338. Subject matter including structure to either modify an electrical parameter in a complementary relationship with a distance-related effect on a telephone signal, or to cause the signal transmitted through the line to be independent of frequency.

SEE OR SEARCH THIS CLASS, SUBCLASS:
394 for line equalization at a telephone substation.
398 for telephone line equalization.

Subclass: 341 [Patents]

Pulse or tone repeater (e.g., electromechanical relay):
This subclass is indented under subclass 338. Subject matter for amplifying or restoring a pulse or tone signal.
(1) Note. Included in this subclass are electromagnetic relays.

SEE OR SEARCH THIS CLASS, SUBCLASS:
238 for interexchange signalling repeaters.
296 for similar subject matter combined with a centralized switching facility.

SEE OR SEARCH CLASS:
361, Electricity: Electrical Systems and Devices, 160 for relay control circuits.
375, Pulse or Digital Communications, 211 for a pulse repeater.

Subclass: 342 [Patents]

Electronic (e.g., logic circuitry):
This subclass is indented under subclass 341. Subject matter having a signal processing component utilizing an electron discharge device or semi-conductor component.

Subclass: 343 [Patents]

Controlled by a pilot or reference signal:
This subclass is indented under subclass 338. Subject matter wherein the repeater is controlled by a signal having a predetermined characteristic (e.g., frequency, amplitude).

Subclass: 344 [Patents]

Component processes bidirectional signals:
This subclass is indented under subclass 338. Subject matter including a component handling signals travelling in either direction over a telephone line.

SEE OR SEARCH CLASS:
370, Multiplex Communications, 276 for a duplex repeater.

Subclass: 345 [Patents]

Including two-to-four wire conversion or hybrid circuit:
This subclass is indented under subclass 344. Subject matter including a component for coupling two physically separate line pairs each conducting a signal in opposite directions to a single two-wire line carrying signals in opposite directions.

SEE OR SEARCH THIS CLASS, SUBCLASS:
391 and 402, for other hybrid circuits in telephone equipment.

Subclass: 346 [Patents]

With frequency discriminator or negative impedance element:
This subclass is indented under subclass 338. Subject matter which (a) selectively passes particular signal frequencies, or (b) has elements which have negative impedance.

Subclass: 347 [Patents]

With gain or attenuation control:
This subclass is indented under subclass 338. Subject matter
having circuitry to maintain or modify any increase or decrease in the magnitude of the signal.

Subclass: 348 [Patents]

Transmission of power to distant repeater:
This subclass is indented under subclass 338. Subject matter where a repeater receives energizing power over the telephone line.

Subclass: 349 [Patents]

Having voice frequency transformer:
This subclass is indented under subclass 338. Subject matter under having a transformer specifically intended for use in the audio frequency range.

Subclass: 350 [Patents]

SUPERVISORY OR CONTROL LINE SIGNALLING:
This subclass is indented under the class definition. Subject matter for transmitting either a selective control signal, or a status indicating signal, over a telephone line.
(1) Note. Included herein are dialing, ringing, and off-hook signals.

SEE OR SEARCH THIS CLASS, SUBCLASS:
251 for centralized switching combined with call associated signalling.

Subclass: 351 [Patents]

Signalling integrity protection (e.g., voice signal immunity):
This subclass is indented under subclass 350. Subject matter including circuitry to distinguish between the supervisory or control signal and other signals on the line and prevent response to the other signals.

Subclass: 352 [Patents]

Substation originated:
This subclass is indented under subclass 350. Subject matter which transmits a called station address signal over a telephone line from a subscriber terminal.
(1) Note. This subclass also includes a transmitted line signal.
(2) Note. Supervisory signals (e.g., off-hook) are excluded from this and indented subclasses are classified in subclasses 377+.

SEE OR SEARCH THIS CLASS, SUBCLASS:
31 for diagnostic testing of a line signal generator.
90 for selective signalling over a telephone line for control of a diverse are device.

SEE OR SEARCH CLASS:
340, Communications: Electrical, 825 for selective signalling not limited to a telephone system; subclasses 345+ for a code transmitting device.
362, Illumination, subclass 24 for an illuminated telephone dial.

Subclass: 353 [Patents]

Conversion of signal form:
This subclass is indented under subclass 352. Subject matter which converts a signal from variations in one parameter to variations of another.
(1) Note. Examples of such parameters are amplitude, frequency, or phase of the control signal.

SEE OR SEARCH THIS CLASS, SUBCLASS:
339 for a repeater having signal conversion.

SEE OR SEARCH CLASS:
341, Coded Data Generation or Conversion, appropriate subclasses for code converters.

Subclass: 354 [Patents]

With called number display:
This subclass is indented under subclass 352. Subject matter which produces a visual indication of the called station address.

Subclass: 355 [Patents]

Repertory or abbreviated call signal generation:
This subclass is indented under subclass 352. Subject matter which produces a complete call address signal i response to actuation of a single key or in response to a generated code of less than the complete address signal.

SEE OR SEARCH THIS CLASS, SUBCLASS:
216 for abbreviated calling performed at a central switching office.

Subclass: 356 [Patents]

With dynamic memory:
This subclass is indented under subclass 355. Subject matter including storage or retrieval of dialing code information by relative motion between a transducer and a relatively movable storage medium a property of which is altered in accordance with the stored information.

SEE OR SEARCH THIS CLASS, SUBCLASS:
68 for a dynamic audio signal memory combined with a telephone system component.

SEE OR SEARCH CLASS:
369, Dynamic Information Storage or Retrieval, appropriate subclasses for dynamic recording reproduction.

Subclass: 357 [Patents]

Insertable control element or circuitry (e.g., card):
This subclass is indented under subclass 355. Subject matter comprising a circuit element or other object which controls the generation of the call signal, and is readily removable from the signal generator.

Subclass: 358 [Patents]

By motor driven dial rotating device:
This subclass is indented under subclass 355. Subject matter wherein the abbreviated call signal controls an electromechanical device which actuates a rotary dial pulse generator.

SEE OR SEARCH THIS CLASS, SUBCLASS:
363 for an electromechanical dial rotating device.

Subclass: 359 [Patents]

Pulse signal generating (e.g., dialing):
This subclass is indented under subclass 355. Subject matter which produces a call address signal in the form of several sequential groups of pulses.

SEE OR SEARCH THIS CLASS, SUBCLASS:
362 for pulse signal call address generators.

Subclass: 360 [Patents]

Voice frequency band signalling (e.g., reed devices):
This subclass is indented under subclass 352. Subject matter wherein of tones within the audible sound spectrum and which have distinct frequencies to perform selective control.
(1) Note. The voice frequency tones are often combination of frequencies.
(2) Note. This subclass also includes read devices.

SEE OR SEARCH THIS CLASS, SUBCLASS:
235 for voice frequency signalling between exchanges.
282 for a voice frequency call address signal receiver.
341 for tone repeaters.
386 for voice frequency line signalling reception.

SEE OR SEARCH CLASS:
341, Coded Data Generation or Conversion, appropriate subclasses for code converters.
375, Pulse or Digital Communications, 272 and 303+ for voice
frequency digital communications and transmitters.

Subclass: 361 [Patents]

Electronic (e.g., tone generator):
This subclass is indented under subclass 360. Subject matter wherein the signalling tones are produced by an electron discharge device or a semiconductor component.

Subclass: 362 [Patents]

Pulse signal generator (e.g., rotary dial):
This subclass is indented under subclass 352. Subject matter wherein the selective control signal is composed of abrupt variations imposed upon a signal.

SEE OR SEARCH CLASS:
341, Coded Data Generation or Conversion, subclass 30 and 184+ for a numerical pulse code transmitter.
375, Pulse or Digital Communications, appropriate subclasses for digital pulse communications.

Subclass: 363 [Patents]

Control of motor driven dial rotating device:
This subclass is indented under subclass 362. Subject matter which includes an electromechanical apparatus for actuating a rotary dial.

SEE OR SEARCH THIS CLASS, SUBCLASS:
358 for repertory or abbreviated dialing using a motor driven dial rotating device.

Subclass: 364 [Patents]

With nonrotary actuator (e.g., key or slide type):
This subclass is indented under subclass 362. Subject matter having a pulse producer actuated by a mechanism having linear motion.
(1) Note. Included herein are actuators of the slide or push button type.

Subclass: 365 [Patents]

Specified switching contact (e.g., contact spring):
This subclass is indented under subclass 362. Subject matter including structure of the electrical switching element.
(1) Note. Included herein are contact spring arrangements.

Subclass: 366 [Patents]

With detail of dial return mechanism (e.g., driving spring, speed governor):
This subclass is indented under subclass 362. Subject matter including structure of the mechanical arrangement for returning the dial to its original position.
(1) Note. Included are driving spring arrangements.

Subclass: 367 [Patents]

Finger wheel or mechanical adjunct (e.g., finger stop):
This subclass is indented under subclass 362. Subject matter including structure of the rotary finger engaging element.
(1) Note. A subcombination limited in extent to a finger wheel, per se, is also classified herein.

SEE OR SEARCH THIS CLASS, SUBCLASS:
456 for a dialing tool.

Subclass: 368 [Patents]

Plural-switch number input device (e.g., keypad):
This subclass is indented under subclass 352. Subject matter including a manually actuated device having several switches for determining the content of the selective control signal.

SEE OR SEARCH CLASS:
341, Coded Data Generation or Conversion, 20 and 173+ for code transmitters.

Subclass: 369 [Patents]

Detail of mounting of switch pad or dial:
This subclass is indented under subclass 352. Subject matter including a support of a manual actuator for the address signal.

Subclass: 370 [Patents]

In handset:
This subclass is indented under subclass 369. Subject matter wherein the actuator and mounting are located in a unitary housing containing both a microphone and earphone.

Subclass: 371 [Patents]

Magneto signalling:
This subclass is indented under subclass 352. Subject matter contains a manually actuated generator for providing a line signal.
(1) Note. These are generally the older hand crank telephone.
(2) Note. The line signal is considered an address signal for purposes of subclass 352.

Subclass: 372 [Patents]

Signal reception at substation:
This subclass is indented under subclass 350. subject matter wherein a control or line signal is received at a subscriber terminal.

SEE OR SEARCH THIS CLASS, SUBCLASS:
386 for systems where the signals are received at a point not specifically designated to be a subscriber terminal.

Subclass: 373 [Patents]

Incoming call alerting (e.g., ringing):
This subclass is indented under subclass 372. Subject matter
where the control or supervisory signal is generated in response to a call directed to a subscriber terminal.

SEE OR SEARCH THIS CLASS, SUBCLASS:
179 for call alerting on a party line.
251 for call associated signal generation in a central switching system.

Subclass: 374 [Patents]

With music or audible message generation:
This subclass is indented under subclass 373. Subject matter for generating an audible alerting signal consisting of music or of a recorded or synthesized spoken message.

SEE OR SEARCH THIS CLASS, SUBCLASS:
67.1 for transmission of a synthesized or a dynamically reproduced audio signal over a telephone line.

Subclass: 375 [Patents]

With electronic call sounder (e.g., tone "ringer"):
This subclass is indented under subclass 373. Subject matter where an audible alerting signal is generated at a subscriber terminal by a circuit having at least one electronic device.

Subclass: 376 [Patents]

With visual indication of incoming call:
This subclass is indented under subclass 373. Subject matter where there is a visible indication at a subscriber terminal which indicates the presence of an incoming telephone call.

SEE OR SEARCH THIS CLASS, SUBCLASS:
247 for display of the identity of a called line or trunk.

Subclass: 377 [Patents]

Using line or loop condition detection (e.g., line circuit):
This subclass is indented under subclass 350. Subject matter in which the supervisory or control signal is generated in
response to an electrical state of a subscriber circuit.

Subclass: 378 [Patents]

With current controlling electromagnetic core device (e.g., Hall-effect device):
This subclass is indented under subclass 377. Subject matter having a magnetizable element within a coiled conductor for current control.

Subclass: 379 [Patents]

With optical link between line and switching system:
This subclass is indented under subclass 377. Subject matter including a communication link between a subscriber's line and a central switching system which uses light waves.

SEE OR SEARCH CLASS:
359, Optics: Systems (Including Communication) and Elements, 109 for optical communications.

Subclass: 380 [Patents]

By bridge circuit:
This subclass is indented under subclass 377. Subject matter including a network arranged so that, when an electromotive force is present across one branch, the response of a suitable detecting device in another branch may be zeroed by suitable adjustment of the electrical consistents of still other branches.

Subclass: 381 [Patents]

Busy test or make busy:
This subclass is indented under subclass 377. Subject matter for determining whether or not a loop or line connected to a terminal is in use, or to simulate such an in-use condition on a line.

SEE OR SEARCH THIS CLASS, SUBCLASS:
274 277 and 337, for various busy testing circuits.

Subclass: 382 [Patents]

For ring trip or polarity reversal detection:
This subclass is indented under subclass 377. Subject matter including detection of a change in the polarity of the potential difference across the line or loop, or of an off-hook condition of the called terminal to cause cessation of the alerting signal.
(1) Note. Off-hook detection often accomplished by distinguishing a voice signal from an A.C. ringing signal.

Subclass: 383 [Patents]

Of plural lines:
This subclass is indented under subclass 377. Subject matter having more than one line or loop.

SEE OR SEARCH THIS CLASS, SUBCLASS:
156 for a multiline system with selective switching and central office connection.
264 for identification of a line in a central office.
333 for a line concentrator.

Subclass: 384 [Patents]

By scanning:
This subclass is indented under subclass 383. Subject matter where a condition of each of the plural loops or lines is detected by sensing each line in sequence.

Subclass: 385 [Patents]

Relayless:
This subclass is indented under subclass 377. Subject matter wherein line or loop condition signalling is performed by circuitry other than electromagnetically operated contacts.

Subclass: 386 [Patents]

Signal receiver (e.g., tone decoder):
This subclass is indented under subclass 350. Subejct matter for receiving the supervisory or control line signal.

SEE OR SEARCH THIS CLASS, SUBCLASS:
351 for similar subject matter having spurious response protection.
372 for supervisory or control line signalling reception at a subscriber terminal.

SEE OR SEARCH CLASS:
340, Communications: Electrical, 825.36 for selective signal indicating.
375, Pulse or Digital Communications, 316 for a pulse communication receiver.

Subclass: 387 [Patents]

SUBSTATION OR TERMINAL CIRCUITRY:
This subclass is indented under the class definition. Subject matter comprising electrical relationships of circuit elements of a terminal set or a group of such sets connected to a single line circuit.

SEE OR SEARCH THIS CLASS, SUBCLASS:
156 for a key substation system.
177 for a polystation line system.
199 for a call limiting substation system.
419 for the structure of a terminal.

Subclass: 388 [Patents]

For loudspeaking terminal:
This subclass is indented under subclass 387. Subject matter including a terminal set having an electrical-to-audio signal transducer which produces an audible signal of sufficient intensity to be intelligible to a user not in contact with the telephone terminal.

SEE OR SEARCH THIS CLASS, SUBCLASS:
420 for loudspeaking terminal structure.
432 for a loudspeaking terminal housing.

Subclass: 389 [Patents]

With circuitry for voice control of transmission direction:
This subclass is indented under subclass 388. Subject matter permitting operation f the terminal in only one direction in response to the presence of a voice signal to be transmitted.

SEE OR SEARCH CLASS:
381, Electrical Audio Signal Processing Systems and Devices, subclass 110 for a voice controlled one-way audio system.

Subclass: 390 [Patents]

With amplification or attenuation level control:
This subclass is indented under subclass 388. Subject matter having a circuit for adjusting or maintaining the level of signal strength.

SEE OR SEARCH THIS CLASS, SUBCLASS:
347 for amplification or attenuation control in a telephone repeater.

SEE OR SEARCH CLASS:
381, Electrical Audio Signal Processing Systems and Devices, 104 for amplitude or volume control for an audio system.

Subclass: 391 [Patents]

Sidetone control or hybrid circuit (e.g., induction coil):
This subclass is indented under subclass 387. Subject matter for maintaining that portion of the speech signal which is transmitted from a telephone transmitter and reproduced at adjacent receiver at a desired degree of separation.

SEE OR SEARCH THIS CLASS, SUBCLASS:
402 for similar subject matter at a telephone line interface.

Subclass: 392 [Patents]

Suppression (e.g., anti-sidetone):
This subclass is indented under subclass 391. Subject matter for minimizing the amount of sidetone reproduced by a receiver.

Subclass: 393 [Patents]

Hold circuit:
This subclass is indented under subclass 387. Subject matter for maintaining a subscriber loop circuit in an active but noncommunicating mode.

SEE OR SEARCH THIS CLASS, SUBCLASS:
162 for a key system hold circuit.

Subclass: 394 [Patents]

Impedance matching or line equalizing:
This subclass is indented under subclass 387. Subject matter wherein the terminal includes a circuit to either make the terminal and line impedances equal, or to equalize frequency attenuation characteristic.

SEE OR SEARCH THIS CLASS, SUBCLASS:
398 for telephone line equalization or impedance matching, other than in terminal circuitry.

Subclass: 395 [Patents]

Amplifying:
This subclass is indented under subclass 387. Subject matter for increasing the audio signal at a terminal.

SEE OR SEARCH CLASS:
330, Amplifiers, appropriate subclasses for an amplifier.
381, Electrical Audio Signal Processing Systems and Devices, 120 for audio systems with amplifiers.

Subclass: 396 [Patents]

Visual signalling (e.g., lamp):
This subclass is indented under subclass 387. Subject matter to modify or emit light in response to one or more terminal conditions.

SEE OR SEARCH THIS CLASS, SUBCLASS:
376 for visual call alerting.

Subclass: 397 [Patents]

Wire distribution:
This subclass is indented under subclass 387. Subject matter including the placement of conductors within the terminal.

SEE OR SEARCH THIS CLASS, SUBCLASS:
326 for wire or cable distribution at a centralized switching facility.

Subclass: 398 [Patents]

LINE EQUALIZATION OR IMPEDANCE MATCHING:
This subclass is indented under the class definition. Subject matter including a circuit to cause the signal transmitted through the line to be independent of frequency, or providing for adjustment of the impedance thereof to optimize signal transmission to, and reception from, a telephone line.

SEE OR SEARCH THIS CLASS, SUBCLASS:
394 for this subject matter in terminal circuitry.

Subclass: 399 [Patents]

SUBSCRIBER LINE OR TRANSMISSION LINE INTERFACE:
This subclass is indented under the class definition. Subject matter including a circuit for connecting a telephone communications line to a central switching office or a subscriber station.

SEE OR SEARCH THIS CLASS, SUBCLASS:
27 for diagnostic testing of a subscriber loop.
219 for interconnection of plural exchanges.
377 for line signalling using line or loop condition detection.
387 for substation circuitry.
398 for line equalization or impedance matching.
414 for transmission line characteristic control.

SEE OR SEARCH CLASS:
333, Wave Transmission Lines and Networks, appropriate subclasses for a passive connection between a transmission line and another device.

Subclass: 400 [Patents]

For line length compensation:
This subclass is indented under subclass 399. Subject matter including structure to change an electrical parameter in a complementary relationship with a distance-related effect on a telephone signal.
(1) Note. Amplifying of a telephone signal is classified in subclasses 338+.

Subclass: 401 [Patents]

Voltage boosting circuit:
This subclass is indented under subclass 400. Subject matter which increases the magnitude of a voltage source in accordance with the length of a related telephone line.

Subclass: 402 [Patents]

Hybrid circuit:
This subclass is indented under subclass 399. Subject matter including a two-wire to four-wire converter.

SEE OR SEARCH THIS CLASS, SUBCLASS:
3 for testing of a hybrid circuits.
344 for similar subject matter including a telephone repeater.
391 for a hybrid circuit in a substation of terminal.

SEE OR SEARCH CLASS:
333, Wave Transmission Lines and Networks, 24 for a coupling network.

Subclass: 403 [Patents]

With adjustable balance circuit:
This subclass is indented under subclass 402. Subject matter which includes a circuit having an impedance the reactive component of which is substantially equal in magnitude and opposite in sign to that of the two-wire line, the impedance being variable for adjustment purposes.

Subclass: 404 [Patents]

Automatic adjustment:
This subclass is indented under subclass 403. Subject matter which varies the impedance of the balance circuit in accordance with a sensed unbalanced condition.

Subclass: 405 [Patents]

Electronic noninductive:
This subclass is indented under subclass 402. Subject matter which connects the bidirectional two-wire line with two unidirection two-wire lines and operated by means of an element in which signal transmission is controlled by an electron discharge device or a semiconductor component.

Subclass: 406 [Patents]

Echo suppression, antisinging, or reverse path blocking:
This subclass is indented under subclass 399. Subject matter including circuitry to prevent undesired reflection, oscillation, or signal transmission.

SEE OR SEARCH THIS CLASS, SUBCLASS:
3 for testing an echo suppressor.
392 for sidetone suppression in a terminal or substation.

Subclass: 407 [Patents]

Disable or inhibit:
This subclass is indented under subclass 406. Subject matter wherein the undesirable signal prevention device includes signal blocking.

Subclass: 408 [Patents]

Control by pilot frequency signal:
This subclass is indented under subclass 406. Subject matter wherein the undesirable signal is prevented by equipment responsive to a reference frequency signal.

Subclass: 409 [Patents]

Having variolosser or attenuator:
This subclass is indented under subclass 406. Subject matter wherein the undesired path signal prevention device reduces the magnitude of the signal.

SEE OR SEARCH CLASS:
333, Wave Transmission Lines and Networks, subclass 81 for an attenuator.

Subclass: 410 [Patents]

Echo cancellation (e.g., phase opposition):
This subclass is indented under subclass 406. Subject matter which produces a replica of the undesired signal and offsetting the undesired signal by said replica.
(1) Note. An example of such signal offsetting would include combining the undesired signal with a phase opposed replica thereof.

SEE OR SEARCH THIS CLASS, SUBCLASS:
3 for testing of an echo suppressor or canceller.
392 for an anti-sidetone device in a telephone terminal or substation.

Subclass: 411 [Patents]

Having transversal filter:
This subclass is indented under subclass 410. Subject matter wherein an echo is cancelled by a multiply tapped delay line with a summing or weighting circuit.

SEE OR SEARCH CLASS:
333, Wave Transmission Lines and Networks, subclass 165 for a time domain filter.

Subclass: 412 [Patents]

Protective circuit:
This subclass is indented under subclass 399. Subject matter having a circuit which prevents damage to the telephone line.

SEE OR SEARCH CLASS:
361, Electricity: Electrical Systems and Device, subclass 119 for high voltage surge protection of a communication line.

Subclass: 413 [Patents]

Power supply (e.g., battery feed):
This subclass is indented under subclass 399. Subject matter wherein the interface further includes a source of electrical energy.

SEE OR SEARCH THIS CLASS, SUBCLASS:
322 for a power supply at a central switching office.

Subclass: 414 [Patents]

TRANSMISSION LINE CONDITIONING:
This subclass is indented under the class definition. Subject matter for varying an electrical parameter of a telephone channel.
(1) Note. This subject matter is often included to bring a circuit value of a desired or standard value.

SEE OR SEARCH THIS CLASS, SUBCLASS:
22 for diagnostic testing of a telephone transmission line.
381 for a make busy arrangement.

SEE OR SEARCH CLASS:
174, Electricity: Conductors and Insulators, appropriate subclasses for a telephone conductor.
333, Wave Transmission Lines and Networks, appropriate subclasses for a load line.

Subclass: 415 [Patents]

Reactance neutralizing:
This subclass is indented under subclass 414. Subject matter for adding a reactive impedance to counteract reactive line impedance.

SEE OR SEARCH THIS CLASS, SUBCLASS:
394 for impedance matching in a telephone substation or terminal.
398 for impedance matching or line equalization.

Subclass: 416 [Patents]

Interference suppression:
This subclass is indented under subclass 414. Subject matter which reduces or eliminates an undesired signal.

SEE OR SEARCH THIS CLASS, SUBCLASS:
3 for testing of an echo suppressor.
400 for echo cancellation or antisinging in a subscriber line or transmission line interface.

Subclass: 417 [Patents]

Anti-crosstalk:
This subclass is indented under subclass 416. Subject matter to reduce or eliminate a signal from one telephone channel induced in another.

Subclass: 418 [Patents]

CALL SIGNAL GENERATING (E.G., RINGING OR TONE GENERATOR):
This subclass is indented under the class definition. Subject matter which produces an electrical signal which actuates a device producing a perceptible signal indicative of the status or presence of a desired call connection.

SEE OR SEARCH THIS CLASS, SUBCLASS:
31 for testing of a line signalling generator.
65 for a single channel telephone carrier system including call signalling.
164 for call alerting in a multiline or key substation.
179 for call alerting in a polystation line system.
201 for a special service.
251 for call signal generation in a centralized switching system.
352 for substation originated call signal generation.
373 for reception of a call alerting signal.

SEE OR SEARCH CLASS:
340, Communications: Electrical, 384.1 for an audible indication.

Subclass: 419 [Patents]

TERMINAL:
This subclass is indented under the class definition. Subject matter including an audio reproducer and microphone.
(1) Note. This and indented subclasses also include subcombinations and components peculiar to such devices and not elsewhere classified.

SEE OR SEARCH THIS CLASS, SUBCLASS:
110.01 for a composite terminal.
156 for key system.
167 for an intercom system station.
352 for call address or other line signalling structure at a
terminal.
441 for accessory or auxiliary equipment usable with the subject matter of this subclass.

SEE OR SEARCH CLASS:
362, Illumination, subclass 88 for an illuminated telephone instrument.
381, Electrical Audio Signal Processing Systems and Devices, 150 for a microphone or speaker, per se.

Subclass: 420 [Patents]

Having loudspeaking conversation capability (e.g., hands-free type or speakerphone):
This subclass is indented under subclass 419. Subject matter which permits conversation with a user without physical contact with the terminal.

SEE OR SEARCH THIS CLASS, SUBCLASS:
388 for circuitry particularly designed for a loudspeaking terminal.

Subclass: 421 [Patents]

Having muting:
This subclass is indented under subclass 419. Subject matter where a transducer in the terminal is prevented from being operational.

Subclass: 422 [Patents]

Switch or switch actuator structure:
This subclass is indented under subclass 419. Subject matter comprising a mechanical or electrical device which completes, breaks, or changes the path of an electrical current.

SEE OR SEARCH CLASS:
200, Electricity: Circuit Makers and Breakers, appropriate subclasses for a switch, per se.

Subclass: 423 [Patents]

Line selection:
This subclass is indented under subclass 422. Subject matter where the switch connects one of a plurality of lines to a component of the system.

SEE OR SEARCH THIS CLASS, SUBCLASS:
156 for substation circuitry including plural lines used with line selecting terminals.

Subclass: 424 [Patents]

Receiver or handset position responsive (e.g., hookswitch):
This subclass is indented under subclass 422. Subject matter which opens or closes the switch contacts in response to a change of relative position between the part of the terminal containing the audio reproducer and the rest of the terminal.

Subclass: 425 [Patents]

With mechanism for latching hookswitch or plunger against motion:
This subclass is indented under subclass 424. Subject matter which includes structure to prevent a hook or plunger operated switch from being operated by the handset or receiver.

Subclass: 426 [Patents]

Movable holder for receiver or handset:
This subclass is indented under subclass 424. Subject matter having a switch actuator which holds the telephone reproducer, the actuator being movable relative to the rest of the terminal.

Subclass: 427 [Patents]

Having plunger and lever linkage:
This subclass is indented under subclass 424. Subject matter where the switch actuator includes a movable rodlike place engaging a rigid piece that pivots about a point to actuate the switch.

Subclass: 428 [Patents]

Housing or housing component:
This subclass is indented under subclass 419. Subject matter having a casing enclosing components of a terminal set.

SEE OR SEARCH CLASS:
D14, Recording, Communication, or Information Retrieval Equipment, 140 for a design a telephone housing.

Subclass: 429 [Patents]

Having distinct circuitry support structure (e.g., circuit board):
This subclass is indented under subclass 428. Subject matter including structure separate from the other terminal elements to hold or connect an electrical component of a telephone.

SEE OR SEARCH CLASS:
361, Electricity: Electrical Systems and Devices, 600 for a housing or mounting assembly for a plurality of diverse electrical components.

Subclass: 430 [Patents]

Body supported (e.g., headgear):
This subclass is indented under subclass 428. Subject matter including apparatus for frictional abutting engagement between the user's body and a telephone terminal receiver-transmitter device.
(1) Note. These instruments include structure to support both a receiver and a transmitter casing adjacent a user's head by engagement therewith.

SEE OR SEARCH THIS CLASS, SUBCLASS:
449 for handset holders that are attachable to terminal housing.

SEE OR SEARCH CLASS:
381, Electrical Audio Signal Processing Systems and Devices, 321 for a stereo headphone, subclass 74 for a headphone circuit, and subclasses 370+ and 385 for a headphone.

Subclass: 431 [Patents]

Separate housings for earphone and microphone (e.g, candlestick type):
This subclass is indented under subclass 428. Subject matter including a transmitter and a receiver in different cases.
(1) Note. The different cases may be separately positioned.

SEE OR SEARCH THIS CLASS, SUBCLASS:
426 for similar subject matter including a hookswitch supported receiver.

Subclass: 432 [Patents]

Loudspeaking set:
This subclass is indented under subclass 428. Subject matter in which a telephone housing radiates reproduced sound to a user located away from the terminal.

SEE OR SEARCH THIS CLASS, SUBCLASS:
420 for a loudspeaking terminal.

Subclass: 433 [Patents]

Handset structure:
This subclass is indented under subclass 428. Subject matter including a housing that contains both the receiver and the transmitter devices.
(1) Note. The receiver and transmitter are usually spaced apart, and have separate acousitc chambers, with a portion of the surrounding or connecting housing forming a handle.

SEE OR SEARCH THIS CLASS, SUBCLASS:
370 for a handset mounting feature for a dial or switchpad.

Subclass: 434 [Patents]

Specified terminal configuration (e.g., novelty type):
This subclass is indented under subclass 428. Subject matter having a specific shape, orientation, simulation or other geometric relation of portions of a telephone terminal housing.
(1) Note. The term simulation is intended to comprehend fanciful characters and caricatures.

SEE OR SEARCH CLASS:
446, Amusement Devices: Toys, 141 for a nonoperative toy telephone.
D14, Recording, Communication, or Information Retrieval Equipment, 140 for an ornamental design of telephone equipment.

Subclass: 435 [Patents]

Wall set or convertible type:
This subclass is indented under subclass 428. Subject matter wherein the telephone set includes structure to provide support from an adjacent vertical building element or to convert the wall set for use upon a horizontal planar surface.

Subclass: 436 [Patents]

Desk set:
This subclass is indented under subclass 428. Subject matter wherein the terminal is configured so as to provide normal operation with the terminal base resting on a horizontal planar surface.

Subclass: 437 [Patents]

Protective structure:
This subclass is indented under subclass 428. Subject matter wherein a terminal includes apparatus to prevent damage to the terminal or some component thereof.

SEE OR SEARCH THIS CLASS, SUBCLASS:
451 for similar subject matter separable from telephone terminal structure.

Subclass: 438 [Patents]

Of cord or connector:
This subclass is indented under subclass 437. Subject matter for protecting a terminal lead wire or connector.

Subclass: 439 [Patents]

Antiseptic:
This subclass is indented under subclass 437. Subject matter for protective germicidal or hygienic structure.

SEE OR SEARCH THIS CLASS, SUBCLASS:
452 for an antiseptic terminal accessory.

Subclass: 440 [Patents]

Casing or enclosure, per se:
This subclass is indented under subclass 428. Subject matter consisting of housing structure surrounding the electromechanical parts of the telephone set.

Subclass: 441 [Patents]

TERMINAL ACCESSORY OR AUXILIARY EQUIPMENT:
This subclass is indented under the class definition. Subject matter used with and not part of a telephone set.

Subclass: 442 [Patents]

With circuit connection to terminal:
This subclass is indented under subclass 441. Subject matter for connecting a device to the line by direct connection through the terminal.
(1) Note. Included herein is a terminal patch cord or connector.

SEE OR SEARCH THIS CLASS, SUBCLASS:
90.01 for a similar circuit connection for diverse art device.

SEE OR SEARCH CLASS:
439, Electrical Connectors, appropriate subclasses for circuit connectors, per se.

Subclass: 443 [Patents]

Including coupler (e.g., inductive);
This subclass is indented under subclass 441. Subject matter for transferring a signal from a telepone terminal other than by direct circuit connection.
(1) Note. Such transfer may be performed by an inductive or other coupling to the telephone terminal.

SEE OR SEARCH THIS CLASS, SUBCLASS:
55.1 for an inductive or other near field link telephone system.

Subclass: 444 [Patents]

Acoustic:
This subclass is indented under subclass 443. Subject matter where the transfer is performed by direct circuit connection.

SEE OR SEARCH THIS CLASS, SUBCLASS:
78 for this subject matter combined with a telephone answering device.

Subclass: 445 [Patents]

Locking device:
This subclass is indented under subclass 441. Subject matter wherein a fastening apparatus prevents unauthorized usage of a telephone.

SEE OR SEARCH CLASS:
70, Locks, appropriate subclasses for a lock, per se.

Subclass: 446 [Patents]

Telephone receiver support:
This subclass is indented under subclass 441. Subject matter including apparatus for holding a telephone receiver to a telephone set.
(1) Note. A support to hold a telephone reproducer to structure other than at telephone set is classified in Class 381, Electrical Audio Signal Processing Systems and Devices, subclasses 386+.

SEE OR SEARCH THIS CLASS, SUBCLASS:
426 for a terminal having a movable holder or a telephone receiver which operates a switch.

SEE OR SEARCH CLASS:
248, Supports, appropriate subclasses, for a support, per se.

Subclass: 447 [Patents]

Attachable to terminal housing:
This subclass is indented under subclass 441. Subject matter having structure to support the accessory or auxiliary equipment adjacent the terminal housing.

Subclass: 448 [Patents]

Hookswitch operator:
This subclass is indented under subclass 447. Subject matter including apparatus for depressing the actuator of a receiver or handset position responsive switch.

SEE OR SEARCH THIS CLASS, SUBCLASS:
424 for a hookswitch.

Subclass: 449 [Patents]

Handset holder (e.g., shoulder rest):
This subclass is indented under subclass 447. Subject matter including apparatus for holding a handset on a human body.

Subclass: 450 [Patents]

Clips onto terminal structure:
This subclass is indented under subclass 447. Subject matter including a device that attaches to the telephone terminal structure.

Subclass: 451 [Patents]

Protective structure:
This subclass is indented under subclass 441. Subject matter including apparatus that guards and/or shields the telephone or some part thereof.

SEE OR SEARCH THIS CLASS, SUBCLASS:
437 for a terminal including apparatus to prevent damage to the terminal or a component thereof.

Subclass: 452 [Patents]

Antiseptic, disinfecting, or disposable:
This subclass is indented under subclass 451. Subject matter including structure to prevent cross-infection by telephone users.
(1) Note. Included herein is antiseptic, disinfecting, or disposable structure.

SEE OR SEARCH THIS CLASS, SUBCLASS:
439 for antiseptic terminal structure.

Subclass: 453 [Patents]

Hood or enclosure (e.g., booth):
This subclass is indented under subclass 441. Subject matter including a protective covering for a telephone or a fenced off or confined area for a telephone as in a telephone booth.

SEE OR SEARCH CLASS:
52, Static Structures (e.g., Buildings), appropriate subclasses for structural detail of a telephone booth absent any significant telephone component structure or relationship.

Subclass: 454 [Patents]

Support or stand:
This subclass is indented under subclass 441. Subject matter including structure to retain the telephone apparatus in a desired position.
(1) Note. The structure can serve as a mounting for a push button, a volume control or other items.

SEE OR SEARCH THIS CLASS, SUBCLASS:
446 for structure to support a telephone receiver from another part of the telephone terminal.

SEE OR SEARCH CLASS:
248, Supports, appropriate subclasses for a support, per se.

Subclass: 455 [Patents]

Handset holder:
This subclass is indented under subclass 454. Subject matter including apparatus that supports the telephone handset.

SEE OR SEARCH THIS CLASS, SUBCLASS:
449 for handset holder attachable to a telephone terminal housing.

Subclass: 456 [Patents]

Dialing tool:
This subclass is indented under subclass 441. Subject matter comprising a device having structure for dialing a telephone.
(1) Note. This subclass requires the device to have a limitation particularly designed for cooperation with the manual actuation device and not merely incidentally useful therewith (e.g., a pencil).

Subclass: 457 [Patents]

MISCELLANEOUS:
This subclass is indented under the class definition.
Subject matter not provided for in any of the preceding subclasses.

SEE OR SEARCH CLASS:
381, Electrical Audio Processing Systems and Devices, appropriate subclasses for one way-audio circuits and audio transducers, per se.


CROSS-REFERENCE ART COLLECTIONS


Subclass: 900 [Patents]

INTERNET (e.g., Internet phone, webphone, Internet-based telephony):
Subject matter comprising combination of a telephone system or component and the Internet, wherein telephonic conversations are conducted, controlled, or monitored via the Internet.

Subclass: 901 [Patents]

VIRTUAL NETWORKS OR VIRTUAL PRIVATE NETWORKS:
Subject matter for programmably effecting as needed, or for controlling, telephone networks, as distinguished from "hard-wired" networks. Sometimes called "software-defined" networks.

SEE OR SEARCH CLASS:
370, Multiplex Communications, 351 for a pathfinding or routing through a switching network or a packet switching network.

Subclass: 902 [Patents]

AUTO-SWITCH FOR AN INCOMING VOICE, DATA, OR FAX TELEPHONE CALL (E.G., COMP/FAX/TEL):
Subject matter comprising a receiving device for automatically detecting an incoming telephone call on a single line and routing to one of several divergent devices intended for communication of voice or data over that telephone line (e.g., answering machine, fax machine, telephone, computer), or for switching between such devices by remote control of a caller.

SEE OR SEARCH THIS CLASS, SUBCLASS:
93.09 for the telephone switching between different terminal types.
100.01 for a fax telephone.

Subclass: 903 [Patents]

PASSWORD:
Subject matter for entering a code through a telephone system to identify an authorized user.

SEE OR SEARCH THIS CLASS, SUBCLASS:
93.03 for a personal identification.

Subclass: 904 [Patents]

AUTO-CALLING:
Subject matter for automated dialing and completion of telephone calls to plural, predetermined destinations.
(1) Note. Such systems may use memory-, repertory- or speed-dialers for addressing of calls, but also perform some additional functions such as automatically retrieving plural stored numbers, or automatically detecting answering devices or persons.

SEE OR SEARCH THIS CLASS, SUBCLASS:
355 for an auto dialer.

Subclass: 905 [Patents]

FAX MAIL:
Subject matter for storing or transmitting a non-telephone signal (that is, a visual or s:graphic representation of a document for producing a visually readable reproduction at a receiving station) from or to a predetermined facsimile destination via a telephone communication channel, usually within a pre-specified time window.

SEE OR SEARCH THIS CLASS, SUBCLASS:
100.08 for an electronic mailbox.

Subclass: 906 [Patents]

TOUCHTONE MESSAGE TRANSMISSION:
Subject matter comprising a system or device using a standard or modified telephone keypad for transmitting an alphanumeric message over a telephone line or channel.

Subclass: 907 [Patents]

SPEECH RECOGNITION VIA TELEPHONE SYSTEM OR COMPONENT:
Subject matter for recognizing speech or voice by means of a telephone set or system component, for purpose of control, identification or access limitation.

SEE OR SEARCH CLASS:
704, Data Processing: Speech Signal Processing, Linguistics, Language Translation, and Audio Compression/Decompression, 231 for speech recognition per se.

Subclass: 908 [Patents]

MULTIMEDIA:
Subject matter comprising a telephone system for transmitting and receiving more than one data type (e.g., text/fax/voice) during a single call session, or for one form of communication to be converted to another (e.g., speech-to-text, text-to-speech, handwriting-to-text or voice, etc.).

SEE OR SEARCH CLASS:
704, Data Processing: Speech Signal Processing, Linguistics, Language Translation, and Audio Compression/Decompression, subclass 260 for speech synthesis including an image-to-speech conversion.

Subclass: 909 [Patents]

ALTERNATIVES:
Subject matter comprising more than one way or preference to perform a specific telephone function or operation.

Subclass: 910 [Patents]

BAR CODE OR OPTICAL CHARACTER READER WITH TELEPHONE:
Subject matter combining a bar code or optical character reader with a telephone component and providing for transmission of data read by the reader over a telephone line or channel.

SEE OR SEARCH CLASS:
235, Registers, subclass 462 for a bar code reader.

Subclass: 911 [Patents]

DISTINCTIVE RINGING:
Subject matter for the generation or detection of telephone ringing signals distinguishable from the standard mechanical-bell signals, for selective identification or routing of received calls relative to the caller or called party or equipment.

SEE OR SEARCH THIS CLASS, SUBCLASS:
180 for full selective or tuned (e.g., harmonic).

Subclass: 912 [Patents]

GEOGRAPHICALLY ADAPTIVE:
Subject matter for selective adaptation of aspects of the telephone system or equipment dependent on where a caller, called party, terminal, or call-processing equipment is geos:graphically located.

Subclass: 913 [Patents]

PERSON LOCATOR OR PERSON-SPECIFIC:
Subject matter for tracking the location (i.e., finding) of a telephone-system subscriber, user, or terminal, or for adapting an aspect of the system or terminal to a specific person.

SEE OR SEARCH THIS CLASS, SUBCLASS:
211 for a call forwarding.

Subclass: 914 [Patents]

PROGRAMMABLE TELEPHONE COMPONENT:
Subject matter to enable or facilitate programming of a telephone system component by a subscriber or user, e.g., enabling a user to use a Dual Tone Multifrequency (DTMF) set to remotely program operational features of a telephone switching system or terminal.

Subclass: 915 [Patents]

"SOFT" KEY:
Subject matter wherein the telephone system component is a programmable function key or an adjunct device coupled to the set and intended for effecting transmission of signals over a telephone line or channel, or controlling the transmission thereof.

Subclass: 916 [Patents]

TOUCH SCREEN ASSOCIATED WITH TELEPHONE SET:
Subject matter combining a telephone set with sensors in front of a display screen which respond to the presence, or touch, of an operator for controlling transmission of signals over a telephone line or channel.

SEE OR SEARCH CLASS:
178, Telegraphy, 18.01 for a writing digitizer pad.
345, Computer Graphics Processing, Operator Interface Processing, and Selective Visual Display Systems, 173 for a combined touch panel and a selective display.

Subclass: 917 [Patents]

VOICE MENUS:
Subject matter for providing stored-voice message strings that offer telephone users a variety of selectable responses.

SEE OR SEARCH THIS CLASS, SUBCLASS:
67.1 for a telephone system having audio message storage or retrieval capability.

FOREIGN ART COLLECTIONS


Subclass: FOR 100

HAVING NEAR FIELD LINK (E.G., CAPACITIVE, INDUCTIVE): Foreign art collection having a transceiver, a base station, and a near field or limited range system (i.e., field strength=k/d where d=distance between the transceiver and base station antennas) whereby signal transfer is inductive or capacitive, rather than electromagnetic.

Subclass: FOR 101

HAVING ELECTROMAGNETIC LINK FOR SPEECH OR PAGING SIGNAL (E.G., LIGHT WAVE LINK): Foreign art collection wherein a circuit connection is made by a transmitted electromagnetic field or wave group.

Subclass: FOR 102

Control of selectively responsive paging arrangement over telephone line: Foreign art collection in which telephone equipment is used to transmit a signal to selectively operate or control equipment to produce a perceptible notification signal over an electromagnetic link.

Subclass: FOR 103

Radio telephone system or instrument: Foreign art collection including either (a) a base station transceiver connected to a land telephone line, or (b) a mobile station.

Subclass: FOR 104

Zoned or cellular system: Foreign art collection including plural stations providing service to different geos:graphical areas.

Subclass: FOR 105

Having zoned/cellular system switching (e.g., handoff): Foreign art collection having communication between base stations to control communications with a mobile station.

Subclass: FOR 106

Including cordless extension set (i.e., having single subscriber line access): Foreign art collection including a base transceiver connected to a single subscriber line and a cooperating portable transceiver.

Subclass: FOR 107

With privacy or lockout (e.g., identity verification): Foreign art collection which permits use of a base station only by an authorized subscriber or transceiver.

Subclass: FOR 108

Including supervisory or control signalling: Foreign art collection for generating, processing, or receiving switching or status indicating signals.

Subclass: FOR 109

HAVING SINGLE CHANNEL TELEPHONE CARRIER: Foreign art collection wherein a single telephone speech signal modulates a carrier signal which has a frequency above the range of human audibility.

Subclass: FOR 110

Including call signalling (e.g., ringing, off-hook, dialing): Foreign art collection which performs a call related signalling operation distinct from voice information.

Subclass: FOR 111

Over power line: Foreign art collection wherein a modulated telephone carrier is transmitted over a power line electrical conductor.

Subclass: FOR 112

TELEPHONE LINE OR SYSTEM COMBINED WITH DIVERSE ELECTRICAL SYSTEM OR SIGNALLING (E.G., COMPOSITE): Foreign art collection wherein a nontelephone signal is transmitted over a conductor of telephone signals, or a telephone signal is
transmitted over nontelephone electrical circuitry.

Subclass: FOR 113

Credit authorization: Foreign art collection to permit or deny a charge to an individual account by nonvoice signals over a telephone line.

Subclass: FOR 114

Polling (e.g., audience survey): Foreign art collection wherein plural controlled devices transmit a personal or personal choice status signal in response to an interrogating signal.

Subclass: FOR 115

With transmission of a digital message signal over a telephone line: Foreign art collection for transmission of message information by either a multi-level pulse signal, or a digital data signal, over lines specifically described as telephone lines.

Subclass: FOR 116

Including switching station: Foreign art collection including a switching facility having structure or circuitry for digital message signal processing.

Subclass: FOR 117

Access restricting: Foreign art collection for restricting telephone access to digital computing or communication equipment.

Subclass: FOR 118

Including terminal for display of digital information: Foreign art collection including structure particularly adapted for conversion of a digital information signal into a visual message signal.

Subclass: FOR 119

By voice frequency signal (e.g., tone code): Foreign art collection wherein the pulse or digital data signal is specifically described as converted into one or more tones lying within the audible frequency spectrum.

Subclass: FOR 120

By modulated audio tone: Foreign art collection wherein a pulse or digital data signal causes a variation in the frequency, phase or amplitude of an audible tone.

Subclass: FOR 121

Having acoustic link: Foreign art collection wherein a digital signalling device is connected to a telephone line by a sound wave passing between a complementary pair of electroacoustal transducers.

Subclass: FOR 122

To produce visual-s:graphic copy reproduction (e.g., facsimile): Foreign art collection where the nontelephone signal is a visual or s:graphic representation of a static document for producing a visually readable permanent copy at a receiving station.

Subclass: FOR 123

Audio program distribution: Foreign art collection where an audio program is transmitted to subscribers over a telephone system.

Subclass: FOR 124

Remote control: Foreign art collection having signalling over a telephone line for control of a nontelephone device at a remote location.

Subclass: FOR 125

Of entrance of exit lock: Foreign art collection which controls a mechanism for permitting or preventing access through a door or other similar structural closure.

Subclass: FOR 126

With indication: Foreign art collection which indicates a condition of the controlled device.

Subclass: FOR 127

From terminal: Foreign art collection wherein a device is controlled from a telephone terminal.

Subclass: FOR 128

Remote indication over telephone line (e.g., telemetry): Foreign art collection for providing a signal representing a sensed condition at a remote location over the telephone line.

Subclass: FOR 129

Meter reading: Foreign art collection where a sensed condition is an indication of a quantitative indicating device.

Subclass: FOR 130

Telegraphy: Foreign art collection for transmitting a telephone signal over a telegraph circuit.

Subclass: FOR 131

Over telephone line: Foreign art collection for transmitting a telegraph signal over a telephone line.

Subclass: FOR 132

COMPOSITE SUBSTATION OR TERMINAL (E.G., HAVING CALCULATOR, RADIO): Foreign art collection in which a telephone instrument also has structure or circuitry for performing a diverse independent (i.e., nontelephone) function.

Subclass: FOR 133

WITH AUDIO MESSAGE STORAGE OR RETRIEVAL: Foreign art collections including subject matter combined with structure for retention of an audio massage signal, or for retrieval thereof.

Subclass: FOR 134

Stored in digital form: Foreign art collections including subject matter including a feature of digital storage or retrieval of the audio signal.

Subclass: FOR 135

Subscriber control of central office message storage or retrieval: Foreign art collections including subject matter wherein the message storage is located at a central switching office and wherein the content of the audio message is controlled from a subscriber terminal.


Information Products Division -- Contacts

Questions regarding this report should be directed to:

U.S. Patent and Trademark Office
Information Products Division
PK3- Suite 441
Washington, DC 20231

tel: (703) 306-2600
FAX: (703) 306-2737
email: oeip@uspto.gov


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Last Modified: 6 October 2000