U.S. PATENT AND TRADEMARK OFFICE
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U.S. Patent Classification System - Classification Definitions
as of June 30, 2000
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Class 334
TUNERS
Class Definition:
This class includes:
(1) Tuners (as defined in the Glossary). In function the
tuner serves to select and pass or reject a particular
frequency from a signal presented to the tuned circuit while
attenuating or suppressing the passage or rejection of any
other frequency that may be present in the signal. Generally
the tuner consists of an inductor and capacitor, one or both
of which may be variable, connected together in such a manner
as to form a resonant circuit. For classification here, some
means must be present in the tuner to vary the mean resonant
frequency of the tuner from one frequency to another. The
means present in the tuner should be something more than just
the incidental showing of a generalized variable impedance
element, but should be some means which is included in the
circuit for the express purpose of making the resonant
circuit variable over a range of frequencies. This means
usually is in the form of a specific variable impedance
device, such as an inductor or capacitor, the variation of
which changes the electrical parameters of the circuit thus
causing a shift in resonance of the circuit. The means may,
however, consist of two or more impedances of fixed value
which are adapted to be switched or substituted into or out
of the resonant circuit. Excluded are wave filters which are
closely analogous in that they are designed to pass or reject
a single frequency or band of frequencies. Wave filters,
generally, have no provisions or means which are particularly
designed for and meant to vary the mean frequency of the
filter during operation of the filter unit in a radio
circuit. The wave filter may have "trimmer" means which is
designed to "peak" the response of the filter, but these
trimmers are not meant to be used in varying the resonance
frequency of the filter during the operation of the filter in
an electrical circuit such as, for example, a radio receiver.
A wave filter having trimmer means is usually adjusted prior
to the installing of the filter in an electrical circuit.
The filter once adjusted is rarely, if ever, adjusted again
unless the resonance characteristic of the filter requires
some additional peaking. A circuit which has means to merely
broaden or narrow the band which is being passed without
varying or changing the means or center frequency to which
the circuit is tuned does not amount to tuning but is
considered a filter for classificaiton with wave transmission
lines and networks (see References to Other Classes, below).
However, a circuit which broadens or narrows the pass band
and which also varies the mean or center frequency of a
filter is considered a tuner.
(2) Included also are tuners with perfecting structure, such
as a remote control circuit, a resonance indicator, tuner
units with an electromagnetic operator, or tuners with
automatic frequency centering circuits which are not
otherwise classifiable.
(3) Also included are tuners combined with or incorporated in
other structure and not elsewhere classifiable, such as a
tuner combined with a tube socket or a special punched
chassis. Also included are tuners combined with or
incorporated in diverse nonelectrical devices and which
combination is not classifiable elsewhere.
(4) Included also are tuners constructed as by the type of
actuator used or from selected material so that the impedance
values of the tuner changes particularly well in response to
a particular condition or change in a particular condition
such as current and/or voltage as, for example; a tuner using
a saturable core type inductor; a tuner using a voltage
responsive capacitor; or a tuner responsive to a magnetic
field. Also included are tuners usually of the mechanically
variable type together with a condition sensing actuator
which changes the mechanical adjustment of the tuner in
response to a condition or a change in condition. An
example, of such a tuner is one having a heat sensitive
actuator, or a tuner that is deformable as by compression by
a weight or force.
(5) Subcombinations and components of tuners not otherwise
classifiable, such as a resonance indicator, are classified
in this class.
LINES WITH OTHER CLASSES AND WITHIN THIS CLASS
A. TUNERS CLASSIFIED ELSEWHERE:
Certain circuits or devices which may be considered tuners
are not classified here. See References to Other Classes,
below, for tuned resonance type wave filters which may be
referred to as a tuner and the resistor-capacitor circuits
such as bridged-T, double-T or Weir Bridge networks, for
example, which are sometimes referred to as tuners. Also see
the Search Class notes for tunable resonators of the
distributed parameter type in which there are no lumped
impedance elements present and where only a single resonator
is used. The inclusion of a lumped impedance element in the
resonant circuit or the coupling of two or more distributed
parameter type units together to form a single tuner will
result in classification in this class.
B. TUNERS COMBINED WITH OR INCORPORATED IN OTHER DEVICES:
As stated above, this class includes tuners combined with or
incorporated in other structure not elsewhere classified.
See Subclass References to the Current Class for tuners
combined with various other devices and for tuners combined
with or having shielding or housing means. The combination
of a tuner with or in other structure or circuits is very
common. A partial list of the classes and subclasses
including this combination is given in References to Other
Classes, below.
C. TUNER COMPONENTS AND SUBCOMBINATIONS:
Included in References to Other Classes, below, is the
classification of the most common subject matter which may
constitute a part or subcombination of a tuner.
D. DEVICES SIMULATING TUNERS:
See References to Other Classes, below, for wave filters, and
resonators of the distributed parameter type.
E. MEASURING OR TESTING TUNERS
This class does not provide for either methods of or
apparatus for measuring and testing tuners. If the measuring
or testing is of a mechanical nature or not otherwise
classified, classification is in Class 73, Measuring and
Testing. See also the Search Notes in Class 73 for a more
detailed field of search to measuring and testing devices and
systems. If the measuring or testing involves determining
the frequency or electrical properties of the tuner,
classification is in Class 324, Electricity: Measuring and
Testing, subclasses 600+.
SEE OR SEARCH THIS CLASS, SUBCLASS:
4 for magnetic field responsive tuners.
subclasses 5+ for condition responsive tuners.
subclasses 12+, for saturable core type tuners.
39 for tuners combined with various other devices.
40 for a lumped resistor element connected in a tuned
circuit.
85 for tuners combined with or having shielding or housing
means.
REFERENCES TO OTHER CLASSES
SEE OR SEARCH CLASS:
40, Card, Picture, or Sign Exhibiting, for means for
displaying information, the information that is displayed may
be the position or channel to which a tuner is adjusted.
40, Card, Picture, or Sign Exhibiting, appropriate subclasses
for means to indicate the position or band to which a tuner
is positioned. (See "Tuner Components and Subcombinations, "
above.)
73, Measuring and Testing, for measuring and testing devices
generally. See "Measuring or Testing tuners", above.
74, Machine Element or Mechanism, subclasses 10+ for
machine elements and mechanisms particularly adapted for
mechanically rotating one or more shafts of electronic tuning
devices into desired angular positions.
74, Machine Element or Mechanism, subclasses 10+ for tuners
by name only combined with shaft operators for radio tuners.
(See "Tuners Combined With or Incorporated in Other Devices"
above)
74, Machine Element or Mechanism, subclasses 10+ for shaft
operators which are particularly adapted for mechanically
rotating one or more shafts of electronic tuning devices into
desired angular positions, and subclasses 527+ for detents
which are used in connection with fixed and movable members
such as a tuner housing and shaft and which are especially
adapted to check or arrest the motion of the movable element.
Such detents are commonly used to properly position the
tuner to some particular frequency or band of frequencies.
(See "Tuner Components and Subcombinations," above.)
84, Music, appropriate subclasses for musical devices that
may use tuned circuits, especially subclasses 671-746 for
electrical tone generation by the use of tuned sound
generators or resonators.
116, Signals and Indicators, subclasses 241+, for indicators
attached to or associated with some movable or adjustable
radio tuning devices to indicate the movement, adjustment or
position of such devices. Usually the indicator is of the
movable-pointer and scale type.
174, Electricity: Conductors and Insulators, subclasses 35+
for shields and screens, per se, and subclasses 50+ for
electrical boxes and housings, per se.
200, Electricity: Circuit Makers and Breakers, appropriate
subclasses for electrical make and break switch, per se,
which may be used in a switch type tuner.
200, Electricity: Circuit Makers and Breakers, appropriate
subclasses for circuit makers and breakers of the switch type
which may be used in combination with several inductors
and/or capacitors to form a switch type tuner. (See "Tuner
Components and Subcombinations, " above)
219, Electric Heating, subclass 750 for microwave heating
with tuned circuits.
219, Electric Heating, subclasses 600+ for inductive
heating, note subclass 750 for microwave heating with tuned
circuits, and subclasses 764+ for capacitive dielectric
heating. (See "Tuners Combined With or Incorporated in Other
Devices,")
250, Radiant Energy, subclass 250 for wave meters utilizing
tuners as an element thereof. (See "Tuners Combined With or
Incorporated in Other Devices," above.)
307, Electrical Transmission or Interconnection Systems,
subclass 105 for electrical transmission or interconnection
systems with harmonic filters which may be adjustable.
315, Electric Lamp and Discharge Devices: Systems, subclass
5.46 for cathode- ray tube circuits in which the cathode ray
passes through plural hollow distributed parameter devices
that are tunable; subclasses 5.53+ for circuits in which the
cathode ray passes through a tunable hollow distributed
parameter device, and subclasses 39.55+ for distributed
parameter resonator type magnetrons having variable tuning
means.
315, Electric Lamp and Discharge Devices: Systems, subclass
5.46 for a cathode-ray tube circuit which has plural hollow
indicator or distributed parameter type inductive structure;
subclasses 5.53+ for cathode ray tube circuits with tunable
distributed parameter type inductive structure, and
subclasses 39.55+ for combined load device or load device
temperature modifying means and electrical magnetron circuit
device structure of the variable tuned distributed parameter
resonator type. (See "Tuners Combined With or Incorporated
in Other Devices," above.)
318, Electricity: Motive Power Systems, subclass 16 for
electrical motor power systems which are controlled from a
distance by space transmitted electromagnetic or
electrostatic energy and which are closely analogous to some
remote controlled tuner circuits; subclass 460 for electrical
motor power systems which have automatic and/or time-delay
means which are responsive to sound, supersonic vibration or
mechanical vibration, and subclass 480 for systems responsive
to radiant energy.
318, Electricity: Motive Power Systems, subclass 16 for a
motor control system controlled by space transmitted
electromagnetic or electrostatic energy, and subclass 510 for
electrical motive power systems having an impedance
controlled armature or primary circuit which comprises
diverse impedances including an inductor and capacitor. (See
"Tuners Combined With or Incorporated in Other Devices,"
above.)
318, Electricity: Motive Power Systems, appropriate subclass
for a motor system which may be used to drive and control a
tuner. Note especially subclasses 445+ for motor control
systems which automatically start and/or stop at a particular
point such as might be used with a remotely controlled
television type tuner. (See "Tuner Components and
Subcombinations,")
322, Electricity: Single Generator Systems, subclass 78 for
generator control systems which have plural impedances in the
excitation circuit, the impedances forming a tuned circuit.
322, Electricity: Single Generator Systems, subclass 78 for
generator control systems which have a tuned or resonant
circuit in the excitation winding or control circuit. (See
"Tuners Combined With or Incorporated in Other Devices,"
above)
324, Electricity: Measuring and Testing, subclass 76.41 for
measuring, testing or sensing electricity, per se, by
frequency comparison, and subclass 76.51 for measuring,
testing or sensing electricity, per se, by a tuning step.
324, Electricity: Measuring and Testing, subclass 76.41 for
circuits which measure, test or sense electricity, per se, by
frequency comparison. The frequency comparison circuit
usually has at least one or more tuned circuits. See also,
subclass 76.51 of Class 324 for frequency testing systems in
general utilizing tuning. (See "Tuners Combined With or
Incorporated in Other Devices," above)
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, subclasses 3+ for miscellaneous
phase comparing circuits and subclasses 40+ for miscellaneous
frequency comparing circuits, either of which may utilize a
tuned circuit.
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, subclasses 3+ for miscellaneous
phase comparing circuits and subclasses 40+ for miscellaneous
frequency comparing circuits, either of which may utilize a
tuned circuit. (See Lines With Other Classes, "Tuners
Combined With or Incorporated in Other Devices," above.)
329, Demodulators, appropriate subclasses for demodulators
with tuned input or indicator.
329, Demodulators, appropriate subclasses for demodulators
with tuned input. (See "Tuners Combined With or Incorporated
in Other Devices, " above.)
330, Amplifiers, subclass 65 for structure of various
amplifier elements such as a tuned circuit; subclasses 144+
for amplifier stages having a variable impedance element
which is controlled by a separate control means; subclass 154
for cascaded amplifiers having a resonant circuit used in the
interstage coupling network; subclasses 165+ for interstage
coupling of the transformer type; subclasses 188+ for
transformer coupled input circuits and subclasses 195+ for
amplifiers having transformer coupling in the output
circuit.
330, Amplifiers, subclass 154, for cascaded amplifier stages
having a transformer or resonant circuit in the interstage
coup- ling, subclasses 157+ for interstage coupling networks
which may include resonant circuits, subclasses 185+ for
input coupling networks and subclasses 192+ for output
coupling networks which may include resonant circuits. (See
"Tuners Combined With or Incorporated in Other Devices,"
above.)
331, Oscillators, subclasses 1+ for oscillators having
automatic frequency stabilization means using a phase or
frequency sensing means; subclasses 96+ for oscillators with
distributed parameter resonators; subclasses 117, 128, and
167+ for inductor-capacitor type oscillators, and subclasses
177+ for oscillators having frequency adjusting means.
331, Oscillators, appropriate subclasses, for oscillator
circuits which contain a frequency or period determining
element such as a resonator or tuning means. See subclasses
1+ for automatic frequency controlled oscillators,
subclasses 167+ for oscillators having an L-C type tuned
circuit, and subclasses 177+ for frequency adjusting means
combined with the oscillator circuit. (See "Tuners Combined
With or Incorporated in Other Devices," above)
332, Modulators, subclass 140 and 142+ for variable
reactance tubes in a frequency modulator and subclass 175 for
a variable tuned circuit in an amplitude modulator.
332, Modulators, appropriate subclasses for modulators using
tuned circuits and particularly subclass 175 for a variable
tuned circuit in an amplitude modulator. (See "Tuners
Combined With or Incorporated in Other Devices," above.)
333, Wave Transmission Lines and Networks, appropriate
subclasses for wave transmission lines and networks which may
be resonant at one or more frequencies, especially subclasses
167+ for wave filter coupling networks and for tuned
resonance type wave filters which may be referred to as a
tuner. (Also found in these subclasses are the
resistor-capacitor circuits such as bridged-T, double-T or
Weir Bridge networks, for example, which are sometimes
referred to as tuners) ; subclasses 235+ for variable
resonators of the distributed parameter type, and subclasses
245+ for long line elements. (see "Tuners Classified
Elsewhere" above)
333, Wave Transmission Lines and Networks, appropriate
subclasses, especially subclasses 167+ for wave filters in
general having fixed center frequencies, particularly
indented subclass 175 for resonant type wave filters, and see
subclasses 219+ for tuners of the distributed parameter
resonator type in which there are no lumped impedance
elements present and where only a single resonator is used.
(See "Tuners Combined With or Incorporated in Other Devices,"
above.)
333, Wave Transmission Lines and Networks, subclasses 213+
for positive or negative reactance networks of the active
element type and subclass 235 for resonators of the
distributed parameter type which may be mechanically and/or
electrically connected together to form a tuner. (See "Tuner
Components and Subcombinations," above.)
335, Electricity: Magnetically Operated Switches, Magnets,
and Electromagnets, subclasses 209+ for magnets and
electromagnets.
336, Inductor Devices, appropriate subclasses for inductors,
per se, which may have a fixed or variable inductance value.
336, Inductor Devices, appropriate subclasses for inductor
devices of the type which are adapted to be combined with
some capacitor means to form a tuned circuit. (See "Tuner
Components and Subcombinations, " above.)
338, Electrical Resistors, appropriate subclasses for
resistors, per se, which may be closely analogous to certain
types of tuners.
338, Electrical Resistors, appropriate subclasses for
resistor elements which may be used in combination with an
inductor and capacitor means to form a tuned circuit. (See
"Tuner Components and Subcombinations, " above.)
340, Communications: Electrical, subclasses 825+ for
selective remote control system; and subclasses 825.69 and
825.72 for systems having a control signal utilized to
control a remotely located system or device.
340, Communications: Electrical, subclass 825.69 and 825.72
for systems having a control signal used for control
purposes. (See"Tuners Combined With or Incorporated in Other
Devices," above.)
343, Communications: Radio Wave Antennas, subclasses 745+
for an antenna having variable reactance for tuning, and
subclasses 850+ for antennas with a coupling network or
impedance in the lead-in.
343, Communications: Radio Wave Antennas, appropriate
subclasses for radio wave energy systems utilizing tuned
circuits, subclass 745 for antennae with variable reactance
means for tuning the antenna. (See "Tuners Combined With or
Incorporated in Other Devices" above.)
346, Recorders, subclass 37 for a recorder device combined
with and responsive to the tuning 346, Recorders, subclass 37
for recording means which is responsive to the tuning means
of a radio receiver. (See "Tuners Combined With or
Incorporated in Other Devices above)
348, Television, subclasses 731+ for tuners associated with
television receiver circuitry including search tuners and
tuners combined with indicator, subclass 734 for remote
control of a tuner in a television receiver, and subclass 735
for automatic frequency control circuits.
361, Electricity: Electrical Systems and Devices, subclass
113 for electrical safety protection systems and devices
having a tune circuit; subclass 270 for transformer or
inductors combined with a capacitor; and subclasses 271+ for
capacitors, per se.
361, Electricity: Electrical Systems and Devices, subclass
113 for electrical equipment having safety or protection
equipment which employs a tuned circuit, and subclasses 161
and 147 for frequency responsive circuits for relays and
electromagnets in which the frequency responsive circuit
usually has one or more tuned circuits. (See "Tuners
Combined With or Incorporated in Other Devices," above.)
361, Electricity: Electrical Systems and Devices, subclasses
271+ for capacitors, per se, which are used in combination
with an inductance means to form a tuner. (See "Tuner
Components and Subcombinations," above.)
370, Multiplex Communications, appropriate subclasses,
particularly subclasses 343+ for combining or distributing
information via frequency channels in communication over free
space, and subclasses 480+ for combining or distributing
information via frequency channels in communication over
wire.
370, Multiplex Communications, appropriate subclasses,
particularly subclasses 343+ for combining or distributing
information via frequency channels in communication over free
space, and subclasses 480+ for combining or distributing
information via frequency channels in communication over
wire. (See "Tuners Combined With or Incorporated in Other
Devices," above.)
373, Industrial Electric Heating Furnaces, subclasses 138+
for electrical induction type furnaces involving a charge
supported by an adequate furnace structure and placed in
electromagnetic relationship with an inducing winding, the
charge forming the secondary of the coil winding. The coil
winding may be resonant with a capacitor.
455, Telecommunications, subclasses 120+ for radio
transmitters with tuners; and subclasses 150.1+ for receivers
with tuners.
455, Telecommunications, subclasses 100+ for a transmitter
having a tuner; and subclasses 150.1+ for a receiver having a
tuner. (See "Tuners Combined With or Incorporated in Other
Devices," above)
455, Telecommunications, subclass 150.1 for apparatus such
as a housing that may be used with a tuner. (See "Tuner
Components and Subcombinations," above)
GLOSSARY:
CAPACITOR
That property of a system of conductors and dielectrics used
to secure an appreciable capacitance by allowing the storage
of electricity when a potential difference exists between the
conductors. There must be at least two or more conductors
separated by a dielectric.
CAPACITANCE
The property of a capacitor to store and hold an electric
charge and which is equivalent to the ratio of the equivalent
charge stored in the capacitor to the resultant change of
potential.
ELECTROMAGNETIC OPERATOR
A machine or device which is capable of exerting a force upon
the control or actuator of an element or circuit to thus move
or control the element or circuit, the machine or device
being operated by the interaction of the magnetic effect of
an electrical current and/or magnetic field. An example, of
this type of machine or device is a relay, solenoid or
electric motor connected to the shaft of a variable
capacitor, the machines or devices responding to a flow of
current and/or voltage through them to thus drive or move the
shaft of the variable capacitor.
FREQUENCY
The number of complete alternations or cycles made by an
alternating signal per unit of time. The frequency unit most
used is cycles per second.
FREQUENCY BAND
A plurality of different frequency channels which are grouped
together into a particular bunch or group of channels all
designated or used for the same purpose. An example of this
is the broadcast band which consists of a plurality of
frequency channels whose center frequencies are separated by
a specified amount, each frequency being used for the same
purpose, namely the transmission of speech. A second example
of a band of frequencies is the use of certain channels of
frequencies for the transmission of television. Here the
common purpose of the plural channels of frequencies making
up the band is the transmission of a video signal plus an
audio signal.
INDICATOR
An element or device which is particularly adapted to point
out or show, usually visually, the position and/or condition
to which a given element or elements are adjusted as, for
example, a scale and pointer, one of which is held stationary
while the other is connected to a rotatable or movable shaft
such as the shaft of a variable capacitor. A second example
would be the use of a meter to indicate the amount of current
and/or voltage flowing in a given circuit.
INDUCTANCE
That property of an electrical circuit, or of two or more
neighboring circuits, by which a varying current produces or
induces an electromotive force in the circuit or neighboring
circuits. If an electromotive force is induced in the
neighboring circuit or circuits, the term mutual inductance
is used.
INDUCTOR
An impedance device comprising a coil means, with or without
core means, for introducing inductance into an electric
circuit. Both transformers and inductive reactors are
included within the meaning of "inductor".
RESONANCE
The point in the adjustment of a tuned circuit to a
particular channel or signal frequency at which the inductive
reactance equals the capacitive reactance. The resonance
frequency may also be described as the point where the
oscillation or vibration present in the circuit may be
maintained with the least amount of external excitation with
the excitation producing a relatively large amplitude of
oscillation or vibration.
TUNER
A device for tuning which consists of an inductor and
capacitor or an inductor, capacitor and resistor so connected
and resistor so connected as to form a resonance circuit, the
mean frequency or channel to which the tuner is resonant
being variable. The resistance may be in the form of the
inherent resistance of the circuit or a lumped resistance
element connected in the circuit. For a lumped resistor
element connected in a tuned circuit, see Subclass References
to the Current Class, above.
TUNING
The step or steps by which a tuner is adjusted in relation to
a signal frequency or channel in order to obtain optimum or
maximum resonance of the tuner circuit or system at some
selected operating point or signal frequency.
VARIABLE INDUCTOR
A passive inductor wherein the inductor device includes a
movable element which may be adjusted to different positions
or adjusted to vary its physical dimensions to change the
effective inductance from one value to another. Examples of
such movable elements are: a tap changing switch, a
distortable coil or core, or movable coupled coils. Inductor
devices designed to change inductance (1) as a function of
the current and/or voltage flowing through the inductor
winding, or (2) in accordance with a magnetic field or bias
applied to the core or coil of the device, or (3) as a
function of the ambient temperature or some external
condition applied to the device, and wherein no physical
element of the inductor is moved to effect such change in
inductance, are not considered adjustable under the above
definition. For such variable inductors, see Subclass
References to the Current Class, above for for magnetic field
responsive tuners, for condition responsive tuners, and for
saturable core type tuners.
SUBCLASSES
Subclass:
1
This subclass is indented under the class definition. Subject
matter wherein the tuning unit consists of two or more tuners
of different types connected together either mechanically
and/or electrically to form a single unitary tuner.
(1) Note. One tuner usually covers a lower frequency while
the second tuner cover a higher frequency as, for example, a
VHF-UHF tuner. Gang operated or combined tuners which cover
only one frequency range, such as for example an intermediate
frequency tuning strip, is not considered a combined tuner
for this class.
SEE OR SEARCH CLASS:
74, Machine Element or Mechanism, subclass 10.45 for
operators used on plural shafts.
455, Telecommunications, appropriate subclasses for radio
receivers which may use a plurality of tuning means.
Subclass:
2
This subclass is indented under subclass 1. Subject matter
wherein the combined tuners comprise at least two different
disk type or two different cylinder type tuners.
(1) Note. For a definition of a disk type tuner see
subclass 49 below and for a definition of a cylinder type
tuner see subclass 50 below.
(2) Note. The combination of a disk or cylinder type tuner
combined with another type tuner such as, for example, a
wafer switch or resonant line tuner are not properly
classified in this subclass. This subclass is restricted to
tuning units in which only at least two species of disk or
two species of cylinder type tuners are combined to form the
tuning unit.
SEE OR SEARCH THIS CLASS, SUBCLASS:
49 for disk type tuners, per se.
50 for cylinder type tuners, per se.
Subclass:
3
This subclass is indented under subclass 1. Subject matter
wherein a plurality of tuning units are mechanically and/or
electrically built together, each of the tuning units
mutually sharing a common tuning element with the tuning
units being so constructed that they are operated in sequence
one after the other by adjusting the common tuning element.
(1) Note. Subject matter usually found in this subclass
consists of a cavity or resonator type tuner mechanically
and/or electrically combined with an inductor-capacitor type
tuning unit, the plunger or contact used to tune the cavity
or resonator also being used to tune the inductor-capacitor
type tuning unit. Thus the tuning element is mutually common
to both type tuners.
SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 41+ for tuners of the resonant line or
distributed parameter type.
subclasses 65+ for tuners in which both the inductor and
capacitor are variable and especially subclasses 66+ for
tuners with a mutual inductor and capacitor varying element.
Subclass:
4
This subclass is indented under the class definition. Subject
matter wherein the tuned circuit is responsive to and varied
by an external magnetic field applied to the tuned circuit or
some element thereof. For example, the magnetic field is
produced by a specially movable permanent magnet.
SEE OR SEARCH THIS CLASS, SUBCLASS:
11 for tuners having a capacitor which is responsive to
voltage or current variations.
subclasses 12+ for tuners having a saturable core type
inductor which is responsive to voltage or current
variations.
SEE OR SEARCH CLASS:
323, Electricity: Power Supply or Regulation Systems,
subclass 250, 330, and 362 for miscellaneous inductive
reactance systems where the reactor includes a permanent
magnet as a part thereof.
336, Inductor Devices, subclass 110 for inductors which are
provided with a permanent magnet to modify the magnetic flux
distribution.
Subclass:
5
This subclass is indented under the class definition. Subject
matter including a tuner, which has at least one variable
element that is mechanically variable, linked with actuating
structure which senses and responds significantly well to a
particular stimulus or condition which is external of the
electrical circuit or a change in such external stimulus or
condition to thereby cause the variable element to change,
adjust or correct the resonant frequency of the tuned
circuit; or including a tuner which has at least one variable
element which is nonmechanically variable and which has the
property, as by chemical composition, of changing its
reactance value in response to a particular stimulus or
condition which is external of the electrical circuit or a
change in such external stimulus or condition to thereby
cause a change, adjustment or correction in the resonant
frequency of the tuned circuit.
(1) Note. For classification here the actuator must be
something more than merely adapted to have a force applied
thereto for the actuation of the mechanical variable or
adjustable tuner, as a knob, pedal or handle. The actuator
must sense the condition or change in condition, and respond
in some manner as by moving or deforming.
(2) Note. The tuner element that is affected by the
particular external stimulus does not necessarily have to
detune the tuner from a particular resonant frequency upon
sensing the external stimulus but may adjust or correct the
tuned circuit to prevent undesired drifting or change in the
resonant frequency of the tuned circuit.
SEE OR SEARCH THIS CLASS, SUBCLASS:
4 for tuners which are responsive to and varied by a
magnetic field applied to the tuned circuit or some element
thereof.
11 for tuners having a capacitor which is responsive to
voltage or current variations within the electrical circuit.
subclasses 12+ for tuners having a saturable core type
inductor which is responsive to voltage or current variations
within the electrical circuit.
SEE OR SEARCH CLASS:
331, Oscillators, subclasses 175+ for oscillators combined
with frequency stabilizing means.
336, Inductor Devices, subclass 30 for inductors with
condition responsive adjustment means.
338, Electrical Resistors, subclasses 13+ for resistors
that are responsive to a condition.
Subclass:
6
This subclass is indented under subclass 5. Subject matter
wherein the tuner includes an inductor and/or capacitor which
is responsive to some external stimulus.
SEE OR SEARCH CLASS:
331, Oscillators, subclasses 65+ for oscillators which have
a device responsive to an external physical condition, and
subclass 176 for temperature or current responsive means in
the oscillator circuit.
336, Inductor Devices, subclass 30 for inductors with
condition responsive adjustment means.
361, Electricity: Electrical Systems and Devices, subclasses
280+ for capacitors, per se, which are responsive to a
condition.
Subclass:
7
This subclass is indented under the class definition. Subject
matter wherein the tuner unit is adapted to be operated by a
series of manually movable push buttons and/or levers with
each button or lever being adapted to selectively move the
tuning element through a mechanical mechanism to a different
preselected position or frequency when manual power is
exerted on a particular button or lever.
(1) Note. Push buttons and/or levers which energize a motor
circuit with the motor furnishing the power to move the tuner
to the preselected circuit are not classified in this
subclass but in subclasses 17+ below (note especially
subclass 29).
SEE OR SEARCH THIS CLASS, SUBCLASS:
29 for tuners combined with electromagnetic drive means
which tunes to a predetermined station and which may be
energized by a push button or lever type switch.
SEE OR SEARCH CLASS:
74, Machine Element or Mechanism, subclass 10.1 for shaft
operators of the radio type which are adapted to turn to or
stop on a predetermined position, and subclasses 469+ for
control lever and linkage systems, per se.
84, Music, subclasses 423+ for keyboard operated musical
devices, the keys serving to select the tuned circuit which
is to be placed into circuit with an electrical tone
generator.
455, Telecommunications, subclass 170.1 for radio receivers
utilizing push button and/or lever operated tuners.
Subclass:
8
This subclass is indented under the class definition. Subject
matter in which the operation of the tuner is controlled from
a relatively distant point removed from the tuner by an
extended or remote control device or circuit.
(1) Note. Remote control devices as found in this subclass
may include a tuner having a separate extended control shaft
connected to an original shaft of the variable tuner element,
thus extending the distance from the tuner to the point where
a control knob or operator may be located; or the remote
control device may consist of circuit means responsive to
space transmitted electromagnetic, electrostatic or radiant
energy.
(2) Note. To be properly classified in this subclass, some
significant details of the tuner must be claimed. A tuner
broadly recited with details to the control system or device
is classified with the control system or device. The control
of a tuner plus some other radio circuit, such as, for
example, an on-off switch is classified with the radio
circuit controlled, such as, for example, radio receivers.
SEE OR SEARCH CLASS:
74, Machine Element or Mechanism, subclasses 10+ for
positioning or rotating means for one or more shafts of an
electronic tuning device such as a radio tuner.
307, Electrical Transmission or Interconnection Systems,
subclass 140 for remote control switching systems.
318, Electricity: Motive Power Systems, subclass 16 for
motors which are controlled or supplied by space transmitted
electromagnetic or electrostatic energy; subclass 460 for
sound or vibration responsive systems, and subclass 480 for
radiant energy responsive systems.
340, Communications: Electrical, subclasses 825+ for
selective remote control systems.
343, Communications: Radio Wave Antennas, subclasses 745+
for antennae with a variable reactance for tuning the
antenna.
348, Television, subclass 734 for television receiver
circuitry having remote control means associated therewith.
361, Electricity: Electrical Systems and Devices, subclasses
173+ for photosensitive circuits for relays and
electromagnets.
455, Telecommunications, subclass 151.1 and 352+ for radio
receivers with remote control.
Subclass:
9
This subclass is indented under subclass 8. Subject matter in
which the remote controlled tuner has an electromagnetic
operator, such as an electric motor, solenoid, or the like.
SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 17+ for tuning units with electromagnetic
operators which are not remotely controlled.
SEE OR SEARCH CLASS:
318, Electricity: Motive Power Systems, subclass 16 for
motors which are controlled or supplied by space transmitted
electromagnetic or electrostatic energy; subclasses 560+, for
electric motor position servomechanism; subclasses 460+ for
sound or vibration responsive systems, and subclass 480 for
radiant energy responsive motor systems.
455, Telecommunications, appropriate subclasses.
Subclass:
10
This subclass is indented under subclass 9. Subject matter in
which the electromagnetic operator is a solenoid and/or relay
device.
SEE OR SEARCH THIS CLASS, SUBCLASS:
19 for band scanning or selector circuit driven by a
solenoid.
SEE OR SEARCH CLASS:
310, Electrical Generator or Motor Structure, subclass 14,
24+, 30+, and 34+ for solenoid motor structure, per se, and
subclass 49 for step-by-step magnetic motor structure.
318, Electricity: Motive Power Systems, appropriate
subclasses, especially subclass 37 and 119+ for
reciprocating or oscillating motor systems and subclasses 38
and 138 for linear movement electric motor systems.
361, Electricity: Electrical Systems and Devices, subclasses
139+ for electric circuits for relays and electromagnets.
Subclass:
11
This subclass is indented under the class definition. Subject
matter wherein the tuned circuit includes a reactance element
or elements which are directly responsive to a change in
voltage and/or current which is applied across or through the
reactance element or elements, with the variation in the
voltage and/or current causing the reactance value of the
element or elements to vary or change and thereby tune or
adjust the resonance of the tuned circuit.
SEE OR SEARCH THIS CLASS, SUBCLASS:
4 for tuners which are responsive to an external magnetic
field, e.g., the magnetic field is that of a spatially
movable permanent magnet.
subclasses 5+ for tuners which are responsive to an
external nonelectrical stimulus or condition.
SEE OR SEARCH CLASS:
257, Active Solid-State Devices (e.g., Transistors,
Solid-State Diodes), appropriate subclasses for active
solid-state devices, per se.
307, Electrical Transmission or Interconnection Systems,
subclasses 401+ for miscellaneous nonlinear reactor
systems.
330, Amplifiers, subclass 145 for amplifiers having variable
impedance elements which are directly responsive to voltage
or current variations.
361, Electricity: Electrical Systems and Devices, subclasses
277+ for variable capacitors, per se.
455, Telecommunications, appropriate subclasses.
Subclass:
12
This subclass is indented under subclass 11. Subject matter
wherein the inductor element is variable in response to
current flow through the inductor winding or in response to a
magnetic field or bias applied to the core element.
SEE OR SEARCH CLASS:
323, Electricity: Power Supply or Regulation Systems,
subclass 206, 214, 249, 302, 310, and 329 for saturable core
inductor systems in general.
331, Oscillators, subclass 181 for oscillators having
frequency adjusting means which may be of the saturable core
inductor type.
332, Modulators, appropriate subclasses and particularly
subclass 173 for modulators having variable circuit
parameters which may be a saturable core device.
333, Wave Transmission Lines and Networks, subclasses 177+
for transformer coupled wave filters having a magnetic core
which may be saturable.
336, Inductor Devices, subclass 155 for inductor devices,
per se, which are responsive to current flow therethrough.
See also the Search Notes for a complete field of search as
to current responsive inductance devices.
Subclass:
13
This subclass is indented under subclass 12. Subject matter
wherein the change in the reactance value of the saturable
core type inductance element is controlled by circuit means
which is responsive to an undesired change in frequency
occurring in the tuned circuit, the circuit means thereby
varying the resonant frequency of the tuned circuit a
sufficient amount to compensate for the undesired frequency
shift.
SEE OR SEARCH THIS CLASS, SUBCLASS:
16 for automatic frequency controlled tuner circuits having
a reactance tuning means.
subclasses 26+ for automatic frequency centering circuits
which have an electromagnetic operator driving the tuning
element.
SEE OR SEARCH CLASS:
331, Oscillators, appropriate subclasses, particularly
subclass 36, for automatic frequency controlled oscillators
which may utilize a saturable inductor.
Subclass:
14
This subclass is indented under subclass 11. Subject matter
in which an active element is operated in such a manner that
it presents the characteristics of a variable reactance to
the rest of the tuned circuit.
SEE OR SEARCH CLASS:
331, Oscillators, subclass 180 for oscillators in which the
variable frequency determining element consists of an active
element type reactance tube.
332, Modulators, subclass 140 and 142+ for reactance tubes
in frequency modulators and 147+ for reactance tubes in phase
modulators.
333, Wave Transmission Lines and Networks, subclasses 213+
for reactance tube systems, per se.
Subclass:
15
This subclass is indented under subclass 14. Subject matter
in which the active element is a semiconductor device.
Subclass:
16
This subclass is indented under subclass 14. Subject matter
in which the variable reactance tuner is provided with
control means for automatically tuning the resonant circuit
to its optimum operating point and to maintain the circuit at
that point by regulating the adjustment of the variable
reactance tuner to compensate for variations in the tuned
circuit or in the frequency of the signal wave to which the
circuit is tuned.
SEE OR SEARCH THIS CLASS, SUBCLASS:
13 for automatic frequency controlled saturable core type
inductor tuning elements.
subclasses 26+ for automatic frequency centering circuits
having an electromagnetic operator.
SEE OR SEARCH CLASS:
331, Oscillators, subclass 36 for oscillators with frequency
control means which may be a reactance tube.
455, Telecommunications, appropriate subclasses.
Subclass:
17
This subclass is indented under the class definition. Subject
matter in which the tuned circuit consists of at least one
variable reactance tuning unit which is adapted to have its
reactance adjusted so as to vary the resonance of the tuner,
the adjustable reactance tuning unit being driven by an
electromagnetic operator which is mechanically connected to
the variable tuning unit.
(1) Note. The reactance tuning may be driven directly or
indirectly by the electromagnetic operator. An example of an
indirectly driven reactance tuning unit is where the
electromagnetic operator is energized periodically and during
these periods loads or winds an energy storage device such as
a spring so that during the period when the electromagnetic
operator is not energized, the energy storage device will
furnish power to drive the variable reactance tuning unit.
(2) Note. To be properly classified in this subclass
significant details of the tuner must be disclosed and
claimed. The mere recitation of a tuner broadly with details
to the electromagnetic operator or control system for the
operator will be classified with the operator or system.
(3) Note. Switch type tuners are considered as variable
reactance tuning units for classification in this and
indented subclasses.
SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 9+ for electromagnetic operated tuners which are
remotely controlled.
SEE OR SEARCH CLASS:
310, Electrical Generator or Motor Structure, appropriate
subclasses for electrical generator or motor structure, per
se.
318, Electricity: Motive Power Systems, appropriate
subclasses for electromagnetic operators with control
systems, per se.
455, Telecommunications, appropriate subclasses.
Subclass:
18
This subclass is indented under subclass 17. Subject matter
in which the electromagnetic operator is provided with a
control system and/or means which causes the operator to
drive the variable tuning unit in such a manner as to scan a
frequency or band of frequencies with the control system
and/or means acting upon the electromagnetic operator or its
associated circuit to stop the scanning of the tuner unit
when the tuner is properly adjusted to receive a given signal
or signals.
(1) Note. Subject matter found in this subclass and the
indented subclasses usually consists of a tuning system with
a driving means which causes the tuner to scan the frequency
band and when a radio signal is tuned in, a control voltage
is applied to the means to deenergize the driving means and
the tuner is stopped on the frequency of the radio signal.
Tuners where the operator is connected to and energized by a
switch which represents a particular frequency, the operation
of the switch causing the operator to drive the tuner to and
stop on the selected frequency, is not classified in this
subclass but in subclass 29 below.
SEE OR SEARCH CLASS:
318, Electricity: Motive Power Systems, subclasses 445+
for electromagnetic operator with control systems for
automatically starting and/or stopping.
Subclass:
19
This subclass is indented under subclass 18. Subject matter
wherein the electromagnetic operator which furnishes the
drive for the variable tuning unit is a solenoid and/or relay
device.
(1) Note. The solenoid may periodically act to load an
energy storage device such as, for example, a spring with the
energy storage device then acting to drive the variable
tuning element. In these cases, the solenoid is considered
to have furnished the drive for the variable tuner and the
subject matter is properly classifiable in this subclass.
SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 10+ for tuners which are remotely controlled and
use a solenoid as a driver means.
SEE OR SEARCH CLASS:
310, Electrical Generator or Motor Structure, subclass 14,
23+, 30, and 34+ for solenoid motor structure, per se.
335, Electricity: Magnetically Operated Switches, Magnets,
and Electromagnets, subclasses 220+ for magneto-mechanical
motive devices.
361, Electricity: Electrical Systems and Devices, subclasses
139+ for electric circuits for relays and electromagnets.
455, Telecommunications, subclass 170.1 for receivers with
frequency selective means (i.e., tuners) with solenoid or
relay means.
Subclass:
20
This subclass is indented under subclass 18. Subject matter
wherein the electromagnetic operator is a motor of the
rotating armature type.
(1) Note. Motors of the reciprocating or oscillating type
are classified in subclass 18 above if they are driving a
band scanning or selector circuit.
SEE OR SEARCH THIS CLASS, SUBCLASS:
9 for remote controlled tuners which may use an electric
motor.
SEE OR SEARCH CLASS:
318, Electricity: Motive Power Systems, appropriate subclass
for motor control systems, per se.
Subclass:
21
This subclass is indented under subclass 20. Subject matter
wherein the electromagnetic operator is provided with a
control system and/or means to select and tune the variable
tuning unit to a predetermined position thereby adjusting the
tuner to resonate at a particular mean frequency.
SEE OR SEARCH THIS CLASS, SUBCLASS:
7 for push button and/or lever operated tuners which are
mechanically adjusted by the pressure exerted upon the button
and/or lever to select or position a tuning element in a
particular position.
subclasses 9+ for remote controlled electromagnetic
operators which may stop on a predetermined frequency such
as, for example, a remotely controlled television tuner.
SEE OR SEARCH CLASS:
318, Electricity: Motive Power Systems, appropriate
subclasses, particularly subclasses 466+ for motors having
control systems that stop the motor at a particular
position.
Subclass:
22
This subclass is indented under subclass 20. Subject matter
wherein the motor is connected to means for reversing the
direction in which the motor is driving the tuner element.
SEE OR SEARCH CLASS:
318, Electricity: Motive Power Systems, appropriate
subclasses, particularly subclass 65 and 280+ for motor
systems connected to a motor-reversing circuit.
Subclass:
23
This subclass is indented under subclass 20. Subject matter
wherein the motor is connected to the variable tuning unit
through a clutch device which is operated by the motor
control circuit.
SEE OR SEARCH CLASS:
192, Clutches and Power-Stop Control, appropriate subclasses
for clutches and power-stop controls, per se, and especially
subclass .02 for interrelated electric motor and clutch
controls.
310, Electrical Generator or Motor Structure, subclasses 92+
for electrical controlled torque-transmitting clutches or
brakes.
Subclass:
24
This subclass is indented under subclass 20. Subject matter
wherein the motor is controlled by a relay device.
SEE OR SEARCH CLASS:
361, Electricity: Electrical Systems and Devices, subclasses
139+ for electric circuits for relays and electromagnets.
Subclass:
25
This subclass is indented under subclass 24. Subject matter
in which plural relays are used to control the motor
circuit.
Subclass:
26
This subclass is indented under subclass 17. Subject matter
in which the electromagnetic operator is provided with a
linkage device for connecting the operator to a variable
tuning unit of a resonant circuit and a control means for
automatically operating the electromagnetic operator so as to
tune the resonant circuit to its optimum operating point and
to maintain the circuit at that point by regulating the
adjustment of the variable tuning unit to compensate for
variations in the tuned circuit or in the frequency of the
signal wave to which the circuit is tuned.
SEE OR SEARCH THIS CLASS, SUBCLASS:
13 for automatic frequency controlled saturable core type
tuning elements.
16 for automatic frequency centering circuits of the
reactance tube type.
SEE OR SEARCH CLASS:
318, Electricity: Motive Power Systems, subclasses 445+
for automatic motor starting and/or stopping means.
322, Electricity: Single Generator Systems, subclass 32 for
dynamoelectric generator systems with frequency responsive
devices or networks for automatically maintaining the
frequency of the generator wave constant.
331, Oscillators, subclasses 1+ for oscillators having
automatic frequency stabilization using a phase or frequency
sensing means.
332, Modulators, subclasses 123+ for controlling an average
condition in a frequency modulator and subclasses 155+ and
159+ for controlling an average condition in an amplitude
modulator.
455, Telecommunications, subclass 125 for radio transmitters
which may utilize a.f.c. circuits and subclasses 257+ for
receivers with a.f.c. circuits.
Subclass:
27
This subclass is indented under subclass 26. Subject matter
in which the linkage device between the electromagnetic
operator and variable tuning unit is a mechanical coupling
element or tool which is adapted to be connected to or
disconnected from the tuning element.
(1) Note. Subject matter usually found in this subclass
consists of motor circuits which drive alignment tools such
as, for example, a screwdriver which may be connected to the
tuner element of a tuned circuit, the motor circuit then
adjusts the resonance of the circuit to some preset value.
Such tool driven aligning apparatus find particular use in
production line tuning of a large number of tuned circuits.
SEE OR SEARCH CLASS:
324, Electricity: Measuring and Testing, subclasses 600+
for measuring and testing impedance, admittance and related
quantities.
330, Amplifiers, subclass 2 for amplifiers with condition
indicating or testing means.
Subclass:
28
This subclass is indented under subclass 26. Subject matter
in which the electromagnetic operator control circuit is
responsive to or requires two or more signal sources in order
to properly center the resonant circuit.
(1) Note. Subject matter usually found in this subclass
consists of circuits which have an information and test
signal both applied to the electromagnetic operator control
circuit so that the tuned circuit is properly adjusted to the
desired resonant frequency.
Subclass:
29
This subclass is indented under subclass 17. Subject matter
wherein the electromagnetic operator is connected to or
controlled by a position or sensing means which acts to
position the variable reactance tuning unit in a
predetermined position upon being actuated.
(1) Note. The motor control circuit is usually energized by
a plurality of push button switches with each of the switches
representing a preselected frequency (i.e., a television
tuner driven by a motor). The motor once energized drives
the tuner element to the proper position to tune in the
desired frequency and then the motor is automatically turned
off.
SEE OR SEARCH THIS CLASS, SUBCLASS:
7 for push button and/or lever operated tuners of the
mechanical type which may tune in predetermined frequencies.
21 for motor operated band scanning or selector circuits
which selects a predetermined frequency such as, for example,
the strongest signal found within the band scanned.
SEE OR SEARCH CLASS:
318, Electricity: Motive Power Systems, subclasses 466+
for motor systems with movement, position or limit-of-travel
sensing means. Also see subclasses 560+, for position
servomechanisms.
Subclass:
30
This subclass is indented under the class definition. Subject
matter wherein the tuner is combined with some form of
electrical indicator which operates in such a manner as to
give an indication of whether or not the tuned circuit is
tuned for maximum output signal strength or peak resonance.
(1) Note. Subject matter found in this and the indented
subclasses properly includes a frequency or phase demodulator
with or without some detail tuning structure together with
detailed tuning indicating structure provided the output from
the frequency or phase demodulator is applied only to the
indicating means. Details of a frequency or phase
demodulator which have an output applied to other circuitry
than the indicating means or where the indicating means is
only claimed broadly in combination with a demodulator,
classification is in Class 329, Demodulators and Detectors,
subclass 111. See also (2) Note under Class 329, subclass
111.
SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 86+ for tuners including a device for conveying
information as to the particular band or position within a
band of frequencies to which the tuner circuit is adjusted.
SEE OR SEARCH CLASS:
250, Radiant Energy, subclass 39 for wave meters.
324, Electricity: Measuring and Testing, subclass 76.39 for
measurement of the frequency of electrical energy.
329, Demodulators, appropriate subclasses for demodulators
which may include some form of electrical indicator.
330, Amplifiers, subclass 2 for amplifiers with condition
indicating or testing means.
331, Oscillators, for oscillators with indicator, signal or
alarm.
332, Modulators, subclass 118 for indicating or measuring in
a frequency modulator and subclass 150 for indicating or
measuring in an amplitude modulator
340, Communications: Electrical, for electrical signaling
generally, especially subclass 870.08 for radio dial
indicators in telemetering systems and subclasses 657+ for
current characteristic controlled electric signals or
alarms.
348, Television, subclasses 569+ for television receiver
tuners having a tuning indicator associated therewith.
455, Telecommunications, subclass 154.1 for receivers with
tuning or resonance indicators.
Subclass:
31
This subclass is indented under subclass 30. Subject matter
wherein the resonance indicator is a meter, such as, for
example, a galvanometer.
Subclass:
32
This subclass is indented under subclass 31. Subject matter
wherein the meter is combined with an optical and/or shading
device.
(1) Note. Usually the optical and/or shading device is
connected directly to the meter movement in such a manner as
to cause a beam of light or a shadow to be cast upon a fixed
scale thus giving an indication of the tuning of the resonant
circuit.
Subclass:
33
This subclass is indented under subclass 30. Subject matter
wherein the resonance indicator is of the cathode ray tube.
SEE OR SEARCH CLASS:
313, Electric Lamp and Discharge Devices, subclasses 364+,
for cathode-ray tubes.
315, Electric Lamp and Discharge Devices: Systems, subclasses
1+ for cathode- ray tube systems in general.
347, Incremental Printing of Symbolic Information, subclasses
121+ for electrostatic recorder using electron beam with an
air tight envelope to create a charged pattern, and
subclasses 226+ for radiation marking using cathode- ray
tube.
348, Television, subclasses 569+ for television receiver
tuners having a tuning indicator, wherein a cathode-ray tube
including the picture display tube may be utilized to
indicate tuning.
Subclass:
34
This subclass is indented under subclass 33. Subject matter
wherein the cathode-ray tube has an annular anode coated with
fluorescent material surrounding an emissive center cathode
and a control electrode for varying the width of the
discharge between the cathode and anode so that as the
potential of the control electrode varies the width of the
nonluminous portion of the anode varies.
SEE OR SEARCH CLASS:
313, Electric Lamp and Discharge Devices, subclass 107.5 for
magic eye indicating tubes, per se.
324, Electricity: Measuring and Testing, subclass 121 for
electrical measuring, testing or sensing circuits, per se, in
which a magic eye tube is used.
Subclass:
35
This subclass is indented under subclass 34. Subject matter
wherein plural nonluminous portions are produced on the
fluorescent anode material.
Subclass:
36
This subclass is indented under subclass 30. Subject matter
wherein the resonance indicator is an electric lamp.
SEE OR SEARCH CLASS:
313, Electric Lamp and Discharge Devices, appropriate
subclass for electric lamp and discharge devices, per se.
340, Communications: Electrical, subclasses 654+ for
electrical condition responsive pilot light indicator systems
in general.
Subclass:
37
This subclass is indented under subclass 36. Subject matter
wherein the resonance indicator lamp is of the gaseous glow
discharge tube type, such as, for example, a neon lamp.
SEE OR SEARCH CLASS:
313, Electric Lamp and Discharge Devices, subclasses 567+
for electric lamp and discharge devices which include an
envelope and an atmosphere of gas or vapor within the
envelope. See also the Search Notes under this subclass for
an additional field of search relating to gaseous discharge
tubes and circuits.
Subclass:
38
This subclass is indented under the class definition. Subject
matter in which a reactance element or elements of a tuned
circuit is wound on a core and is adapted to be unwound
therefrom, as on a second core, to change the reactance
values of the tuned circuit.
(1) Note. Examples of subject matter classified here
include an inductor whose element is wound from an insulating
core to a conducting core, the conducting core
short-circuiting the portion of the inductor element wound
thereon; or a capacitor which is varied by winding or
unwinding one plate of the capacitor over a second insulated
plate shaped in the form of a cylinder or core.
SEE OR SEARCH CLASS:
191, Electricity: Transmission to Vehicles, subclass 12.2
for an electric current supply conductor and reel means upon
which the conductor may be wound.
242, Winding, Tensioning, or Guiding, appropriate subclasses
for winding, tensioning, or guiding in general use.
336, Inductor Devices, subclass 15 for variable inductors
whose effective length is changed by winding or unwinding the
conductor forming the inductor.
338, Electrical Resistors, subclass 79, for mechanically
variable resistors which are varied by winding or unwinding
the resistance element from a core or form.
343, Communications: Radio Wave Antennas, subclass 877, for
antennae having a reel upon which the antenna may be wound.
Subclass:
39
This subclass is indented under the class definition. Tuning
devices in which the tuner is combined with structure other
than tuner structure or some change in tuning structure
and/or design which improves the operation of the tuner and
which is not otherwise classified.
SEE OR SEARCH CLASS:
84, Music, appropriate subclasses for musical devices that
may use tuned circuits, especially subclasses 671-746 for
electrical tone generation by the use of tuned sound
generators or resonators. Also subclasses 423+ for keyboard
operated musical devices, the keys serving to select the
tuned circuit which is to be placed into circuit with an
electrical tone generator.
219, Electric Heating, subclass 750 for microwave heating
with tuned circuits.
322, Electricity: Single Generator Systems, subclass 78 for
generator control systems which have plural impedances in the
excitation circuit, the impedances forming a tuned circuit.
324, Electricity: Measuring and Testing, subclasses 600+
for tuners combined with means to measure the impedance,
admittance and related quantities of the tuner.
329, Demodulators, appropriate subclasses for demodulators
with tuning or indicating structure.
331, Oscillators, appropriate subclass for oscillators having
a tuned circuit, especially subclasses 177+ for oscillators
with frequency adjusting means.
336, Inductor Devices, subclasses 105+ for inductors
combined with some other structure such as, for example, a
connector.
343, Communications: Radio Wave Antennas, subclasses 350+,
850+ and 866+ for tuners combined with detailed antenna
structure.
348, Television, subclass 731 for tuners combined with
television receiver circuitry.
361, Electricity: Electrical Systems and Devices, subclass
113 for a safety and protective system or device combined
with a tuned circuit; subclasses 268+ for a transformer or
inductor combined with a switch, capacitor or lock; and
subclasses 275.1+ for a capacitor combined with some other
structure such as, for example, an electrical socket.
370, Multiplex Communications, appropriate subclasses for
multiplex systems which are tunable by an inductor or
capacitor.
373, Industrial Electric Heating Furnaces, subclasses 138+
for induction type electrical furnaces which may use a tuned
circuit.
455, Telecommunications, appropriate subclasses.
Subclass:
40
This subclass is indented under the class definition. Subject
matter wherein some resistance value is built into or adapted
to be inserted into or removed from a tuned circuit to
thereby vary the "Q" or damping of the circuit.
(1) Note. The sharpness of the resonance or sensitivity of
a tuned circuit is determined by the ratio of energy stored
to energy dissipated, hence is directly proportional to the
reactance in the circuit and inversely proportional to the
resistance. This ratio of stored energy to dissipated energy
is called the "Q" of the circuit.
(2) Note. The resistance of the tuned circuit does not have
to be of the variable type but may be a fixed type
resistance. The resistance must, however, be more than the
inherent load resistance presented across the circuit when
the circuit is connected to a load.
SEE OR SEARCH CLASS:
333, Wave Transmission Lines and Networks, subclass 173 for
wave filter networks that may utilize ohmic resistance
elements for controlling the selectivity or frequency band
width of the network.
Subclass:
41
This subclass is indented under the class definition. Subject
matter wherein the inductance and capacitance of the tuned
circuit is of the distributed parameter type and is adapted
to have the mean resonant frequency of the circuit adjusted
in discrete, distinct steps; or where a plurality of tuned
circuits are ganged together either mechanically and/or
electrically so as to have their means resonant frequency
adjusted in unison.
(1) Note. Resonators, which are closely analogous to tuners
found in this subclass, are classified in Class 333, Wave
Transmission Lines and Networks, especially subclasses 219+.
The resonators found in Class 333, subclasses 219+ comprise
conductive enclosures, cavities, or wave transmission line
sections of the two terminal type and have both distributed
inductance and capacitance. Even though a resonator may be
provided with tuning means and designated as a tuner, if the
resonator is a single circuit having both inductance and
capacitance of the distributed parameter type with the
adjustment of the resonant frequency being of a continuous,
unbroken type, classification is in Class 333, Wave
Transmission Lines and Networks, subclasses 219+. Single
circuits in which only the inductance and capacitance is of
the distributed type are classified in this subclass and the
indented subclasses thereunder. See also the notes under
Class 333, subclasses 167 and 219.
SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 1+ especially subclass 3 for a resonator type
tuner combined with some other type tuner such as, for
example, a lumped inductor-capacitor circuit.
SEE OR SEARCH CLASS:
219, Electric Heating, subclass 750 for microwave heating
with tuned circuits.
315, Electric Lamp and Discharge Devices: Systems, subclass
5.46 for cathode-ray tube circuits in which the cathode ray
passes through plural hollow distributed parameter devices
that are tunable; subclasses 5.53+ for circuits in which the
cathode ray passes through a tunable hollow distributed
parameter device, and subclasses 39.55+ for distributed
parameter resonator type magnetrons having variable tuning
means.
330, Amplifiers, subclass 45 for a linear amplifier having
an electron beam vacuum tube coupled to a cavity resonator;
subclass 49 for a linear amplifier having a vacuum tube
amplifying device which has distributed parameter
characteristics which may involve a resonator, and subclass
56 for linear amplifiers involving wave guide, cavity, or
concentric line resonator coupling generally.
331, Oscillators, subclass 5, 6+, 9, 79+, 86+, 93, and 96+
for oscillators which have a distributed parameter
resonator.
332, Modulators, subclasses 129+ for resonators in a
frequency modulator and subclasses 163+ for resonators in an
amplitude modulator.
333, Wave Transmission Lines and Networks, subclasses 219+
for resonators of the distributed parameter type, per se.
See (1) Note above.
343, Communications: Radio Wave Antennas, subclass 723 for
single adjustable length electrically long linear antennae;
subclasses 745+ for antennae with a variable reactance for
tuning the antenna; subclasses 746 and 767+ for slot type
antennae which may involve resonator structure; subclasses
790+ for sleeve type antennae; subclasses 793+ for balanced
doublet type antennae which may have resonant
characteristics, and subclasses 825+ and 843 for antennae
having appreciable wave length dimensions.
455, Telecommunications, subclasses 120+ for transmitters
involving wave filters, subclasses 150.1+ for receivers with
filters or tuners and subclasses 78+ for wave meters using
tuners or filters.
Subclass:
42
This subclass is indented under subclass 41. Subject matter
wherein two or more distributed parameter type tuners are
electrically and/or mechanically interlinked so as to be
simultaneously adjusted over a given frequency range.
SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 1+ for combined diverse type tuners.
Subclass:
43
This subclass is indented under subclass 42. Subject matter
wherein the distributed parameter type tuners are adjusted by
a shaft operator.
(1) Note. Plural distributed parameter type tuners which
are simultaneously adjusted by a cam or screw driven by a
shaft are not classified in this subclass but in subclass 42
above.
SEE OR SEARCH CLASS:
74, Machine Element or Mechanism, subclasses 10+ for shaft
operators, per se, which are particularly adapted to drive or
rotate a radio tuning shaft.
Subclass:
44
This subclass is indented under subclass 41. Subject matter
wherein the inductance and/or capacitance having the
distributed reactance is adapted to be deformed, as by
bending, twisting or collapsing, so that the distributed
reactance is varied thus varying the frequency of the tuned
circuit.
SEE OR SEARCH THIS CLASS, SUBCLASS:
46 for tuners which have a lumped reactance element which is
varied by compression or deformation.
Subclass:
45
This subclass is indented under subclass 41. Subject matter
in which at least a portion of the capacitance necessary to
tune the resonant circuit is furnished by a lumped
capacitor.
(1) Note. The lumped capacitor is usually variable and is
used to tune the resonant circuit, however, the capacitor may
be fixed in value.
SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 78+ for tuners which are tuned by a variable
capacitor.
Subclass:
46
This subclass is indented under the class definition. Subject
matter wherein a tuned circuit includes a lumped deformable
type tuning element or elements together with the necessary
mechanical structure for modifying the shape of the tuning
element, as by changing the physical shape of the tuning
element or elements to thereby change the reactance of the
tuned circuit.
(1) Note. The compressing together of a plurality of
capacitor plates to thereby vary the capacitance of the unit
is not considered as deforming the element and, thus, is not
properly classified in this subclass but in subclass 80
below.
SEE OR SEARCH THIS CLASS, SUBCLASS:
44 for tuned circuits having distributed parameter type
inductance and/or capacitance which is adapted to be deformed
to vary the tuning of the circuit.
80 for capacitors which have plates which are movable so as
to vary the spacing between the plates as for example, by
compressing the plates together. See (1) Note above.
SEE OR SEARCH CLASS:
336, Inductor Devices, subclass 20 for tuners with
deformable or distortable coil and/or core. See also the
Search Notes for a detailed field of search as to deformable
inductor type devices.
338, Electrical Resistors, subclass 114 for resistor
elements which are of the deformable type.
Subclass:
47
This subclass is indented under the class definition. Subject
matter wherein an element or elements of at least one tuned
circuit is modified or substituted by a switching operation
to thereby effectively change the resonant frequency to which
the circuit is tuned.
(1) Note. The switching operation may be performed by a
make and break mechanical switch or by an electrical switch
such as a tube or semiconductor device. Plug in type tuned
circuits are also properly classified in the subclass.
(2) Note. The modifying or substituting of the tuning
circuit may be accomplished by shorting a portion of one or
more of the tuned circuit elements, thus varying the
frequency of the circuit, or by substituting elements in the
tuned circuit or by switching one complete tuned circuit for
another such as generally found in television tuners. Fine
tuning of the tuned circuit may be accomplished by using an
adjustable inductor and/or capacitor in addition to the
switching means.
(3) Note. The mere operation of a switch which does not
effect the tuning of the tuned circuit is not classified in
this subclass but in subclass 39 above.
SEE OR SEARCH THIS CLASS, SUBCLASS:
7 for push button and/or lever mechanically operated tuners
which may be of the switch type.
subclasses 86+ for tuners having an indicator to show the
position or frequency to which the variable tuning element or
elements are adjusted or switched.
SEE OR SEARCH CLASS:
74, Machine Element or Mechanism, subclasses 10+ for
mechanical mechanism for rotating a shaft including such
mechanism designed for use with a switching means. See also
the Search Notes to subclass 10 for additional fields of
search for moving mechanism.
200, Electricity: Circuit Makers and Breakers, appropriate
subclasses for the construction of make and break type
switching elements, per se.
323, Electricity: Power Supply or Regulation Systems,
subclass 255 and 340 for tap changers.
336, Inductor Devices, subclasses 137+ for the structure of
inductors having means to change the length or connection of
the inductor.
343, Communications: Radio Wave Antennas, subclass 748 for
loop type antennae with a variable reactance for tuning the
antenna, and subclass 868 for loop type antennae having means
for adjusting the coil length.
Subclass:
48
This subclass is indented under subclass 47. Subject matter
wherein the switch type tuner is constructed so as to have a
contact terminal or plate which is adapted to contact or
approach a second terminal or plate held on a stationary
portion of the tuner unit, the contact terminals or plates of
the tuner being constructed so as to allow a rocking movement
between the movable and stationary contacts, thus varying the
resonant frequency of the tuned circuit without breaking
electrical contact between the stationary and movable
contacts.
Subclass:
49
This subclass is indented under subclass 47. Subject matter
wherein the element or elements of the tuner are carried upon
a flat circular plate or disk type support with the plate or
disk support revolving about its center axis and thereby
switching the element or elements into or out of a circuit in
a predetermined order.
(1) Note. A turret tuner of the disk type, such as found in
this subclass, or of the drum type, such as found in
subclasses 51+ below, are basically of the switching type in
which the movable turret portion carries tuning elements and
contact members which are moved with respect to a group of
stationary contacts. A switch type unit having stationary
tuning elements connected to stationary contact elements with
the stationary contacts being swept or switched into or out
of circuit by a rotating contact are not classified in this
subclass nor in subclasses 51+ below but are found in the
appropriate subclasses under subclasses 47+.
SEE OR SEARCH CLASS:
74, Machine Element or Mechanism, subclasses 10+ for
mechanical mechanism for rotating a shaft including such
mechanism designed for use in a disk type turret tuner. See
also the Search Notes to subclass 10 for additional fields of
search for moving mechanism.
200, Electricity: Circuit Makers and Breakers, subclasses 1+
for multiple control circuit switches, and subclasses
19.06+ for circuit makers and breakers which operate
periodically to control multiple circuits.
Subclass:
50
This subclass is indented under subclass 47. Subject matter
wherein the switching unit consists of a rotatable drum or
cylinder having a plurality of individual components or
tuning elements secured in position about the periphery of
the drum or cylinder, the components or tuning elements being
connected to contact elements which are also carried on the
periphery of the drum or cylinder, and rotating means to move
the drum or cylinder about its longitudinal axis to thereby
bring the contacts located on the drum or cylinder into
contact with stationary contacts located on a support member
adjacent a portion of the surface of the drum or cylinder.
(1) Note. For the difference between subject matter found
in this subclass and the other subclasses under 47+, see (1)
Note under subclass 49 above.
SEE OR SEARCH THIS CLASS, SUBCLASS:
2 for a plurality of diverse disk or diverse turret tuners
combined together either mechanically or electrically.
SEE OR SEARCH CLASS:
74, Machine Element or Mechanism, subclasses 10+ and the
subclasses specified in the notes thereto for mechanical
mechanism for rotating a shaft including such mechanism
designed for use with a switching means. See also the Search
Notes to subclass 10 for additional fields of search for
moving mechanism.
200, Electricity: Circuit Makers and Breakers, subclasses 1+
for multiple control circuit switches, and subclasses
19.06+ for circuit makers and breakers which operate
periodically to control multiple circuits.
Subclass:
51
This subclass is indented under subclass 50. Subject matter
in which the tuner has means associated therewith to give
fine tuning or adjustment to the tuned circuit.
SEE OR SEARCH THIS CLASS, SUBCLASS:
48 for tuners wherein fine tuning is achieved by rocking the
tuner switch.
subclasses 57+ for vernier tuning means combined with a
tuner which is adjusted by modifying or substituting the
inductor element by switching.
subclasses 71+ for tuned circuits in which the resonant
frequency is varied by a continuously variable inductor.
subclasses 78+ for tuned circuits in which the resonant
frequency is varied by a continuously variable capacitor.
subclasses 86+ for tuners having an indicator to show the
position or frequency to which the variable tuning element or
elements are adjusted.
Subclass:
52
This subclass is indented under subclass 47. Subject matter
in which the switching means used to vary or change the
frequency setting or band of frequencies to which the tuner
is resonant is operated by the adjustment or movement of a
variable tuning means such as a variable capacitor.
(1) Note. An example of the type of tuner found in this
subclass is one in which a variable capacitor, adapted to
rotate through 360 deg., is used to fine tune or spread a
given frequency to which the tuner is resonant with special
switching means being associated with the capacitor to
thereby switch into the tuned circuit various other tuning
elements each time the capacitor is rotated through one
complete revolution and thus change the band of frequencies
to which the tuner is resonant.
SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 65+ for tuners in general wherein both inductor
and capacitor are variable.
Subclass:
53
This subclass is indented under subclass 52. Subject matter
in which the switch is of the rectilinearly movable or
reciprocating contact type.
SEE OR SEARCH THIS CLASS, SUBCLASS:
54 for tuners which are varied by switching various elements
into or out of the tune circuit where the switch is
rectilinearly operated.
SEE OR SEARCH CLASS:
200, Electricity: Circuit Makers and Breakers, subclass 16
for reciprocating type switches used to control multiple
circuits; subclasses 449+ for reciprocating switches having a
snap action, and subclasses 554+ for mechanically operated
switches having a knife blade or plug which moves in a
reciprocating manner.
Subclass:
54
This subclass is indented under subclass 47. Subject matter
in which the switch is of the rectilinearly movable or
reciprocating contact type.
SEE OR SEARCH THIS CLASS, SUBCLASS:
53 for tuners having a rectilinearly operated switch which
is operated by a variable tuning means.
SEE OR SEARCH CLASS:
200, Electricity: Circuit Makers and Breakers, subclass 16
for reciprocating type switches used to control multiple
circuits; subclasses 449+ for reciprocating switches having a
snap action, and subclasses 554+ for mechanically operated
switches having a knife blade or plug which moves in a
reciprocating manner.
Subclass:
55
This subclass is indented under subclass 47. Subject matter
in which the element or elements substituted by the switching
operation consists of a plurality of capacitors.
(1) Note. Subject matter usually found in this subclass
consists of an inductor element which is mechanically fixed
in the tuned circuit and is connected to a switch which
substitutes various capacitors into or out of the circuit to
thus vary the resonant frequency of the tuner.
SEE OR SEARCH THIS CLASS, SUBCLASS:
7 for push button and/or lever operated tuners which may be
of the type which substitutes one capacitor for another
within the tuned circuit.
subclasses 78+ for tuner units which are tuned by a
continuous variable capacitor.
SEE OR SEARCH CLASS:
320, Electricity: Battery or Capacitor Charging or
Discharging, subclasses 166+ for charging or discharging a
capacitor, per se.
Subclass:
56
This subclass is indented under subclass 47. Subject matter
in which the element or elements substituted by the switching
operation consists of a plurality of inductors.
(1) Note. Subject matter usually found in this subclass
consists of a capacitor element which is mechanically fixed
in the tuned circuit and is connected to a switch which
substitutes various inductors into or out of the circuit to
thus vary the resonant frequency of the tuner.
SEE OR SEARCH THIS CLASS, SUBCLASS:
7 for push button and/or lever operated tuners which may be
of the type which substitutes one inductor for another within
the tuned circuit.
subclasses 71+ for tuner units which are tuned by a
continuous variable inductor.
SEE OR SEARCH CLASS:
336, Inductor Devices, subclasses 137+ for inductors having
means to change the length or connections of the inductor.
See Search Notes under subclass 137 for additional fields of
search as to variable inductance devices.
Subclass:
57
This subclass is indented under subclass 56. Subject matter
in which the tuner has means associated therewith to give
fine tuning or adjustment to the tuned circuit.
SEE OR SEARCH THIS CLASS, SUBCLASS:
51 for vernier tuning means combined with a drum or cylinder
type turret tuner.
subclasses 71+ for tuned circuits in which the resonant
frequency is varied by a continuously variable inductor.
Subclass:
58
This subclass is indented under subclass 57. Subject matter
wherein the vernier tuning means is a variable capacitor.
SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 78+ for tuned circuits in which the resonant
frequency is varied by a continuously varied capacitor.
SEE OR SEARCH CLASS:
361, Electricity: Electrical Systems and Devices, subclasses
271+ for capacitors, per se. See also the Search Notes
under this subclass for a complete field of search as to
capacitors.
Subclass:
59
This subclass is indented under subclass 47. Subject matter
in which a selector switch is operated in such a manner as to
introduce into a selector circuit an independent set of
frequency determining parameters consisting of a tuned
transformer circuit.
SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 61+ for tuners having mutual inductance variable
means which may be a tuned transformer circuit.
SEE OR SEARCH CLASS:
307, Electrical Transmission or Interconnection Systems,
appropriate subclasses, especially subclass 83 for plural
transformer systems in general.
323, Electricity: Power Supply or Regulation Systems,
subclass 247, 301, 305, and 328 for transformer systems in
voltage magnitude control systems.
330, Amplifiers, subclass 154 for cascaded amplifiers with
different coupling between the stages, one of which is a
transformer, and subclasses 165+ for transformers used as
interstage coupling between amplifier stages.
333, Wave Transmission Lines and Networks, subclasses 177+
for wave transmission transformer coupled circuits of the
passive type, generally.
336, Inductor Devices, appropriate subclass for transformer
structure.
361, Electricity: Electrical Systems and Devices, subclasses
268+ for transformers with integral switch, condenser or
lock means.
Subclass:
60
This subclass is indented under subclass 59. Subject matter
wherein the tuned circuit or a portion thereof is short
circuited by a switching device to thus vary the frequency or
band of frequencies at which the circuit will resonate.
Subclass:
61
This subclass is indented under the class definition. Subject
matter wherein a variable tuned circuit or circuits consists
of at least two or more windings which are so constructed or
located that the windings are mutually coupled together by
the magnetic field or the electric and magnetic fields
created by and existing between the windings, with means
being present in the circuit or circuits to vary the
electrical and/or magnetic coupling existing between the
windings so as to cause or effect a change in the mean
resonant frequency and thus vary the tuning of the circuit or
circuits.
(1) Note. The two or more mutual inductance coupled
windings may be in effect two coils connected in series or a
single winding folded upon itself as, for example, a
variometer.
SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 59+ for tuned transformer substitution
circuits.
subclasses 65+ for tuners in which both the inductor and
capacitor are variable.
subclasses 71+ for tuners which are tuned by a variable
inductor.
SEE OR SEARCH CLASS:
323, Electricity: Power Supply or Regulation Systems,
subclass 247, 301, 305, 328, and 355 for transformer
systems.
330, Amplifiers, subclass 154, 165+, 188+, and 195+ for
amplifiers having transformer coupling.
333, Wave Transmission Lines and Networks, subclasses 167+
for coupling networks of the wave filter type which are
adapted to pass or reject only a single frequency or band of
frequencies particularly indented subclasses 177+ for
transformer coupled filters.
336, Inductor Devices, appropriate subclass for transformers
which are not designed to be frequency responsive.
343, Communications: Radio Wave Antennas, subclasses 850+
for antennae with coupling network or impedance in the
lead-in.
361, Electricity: Electrical Systems and Devices subclasses
268+ for transformers or inductors combined with a switch,
condenser or lock.
379, Telephonic Communications, subclass 443 for induction
coils combined with the structure of telephone instruments.
Subclass:
62
This subclass is indented under subclass 61. Subject matter
wherein the variable mutual inductance device consists of two
coils connected in series and so mounted that one coil can be
rotated within the magnetic field or the electric and
magnetic field of the other.
SEE OR SEARCH CLASS:
323, Electricity: Power Supply or Regulation Systems,
subclass 216, 264, and 347 for transformer systems with
movable structure or windings.
333, Wave Transmission Lines and Networks, subclasses 24+
for coupling networks, including filters, equalizers and
delay networks having relatively movable coils, and
especially subclasses 177+ for transformer coupled wave
filters.
336, Inductor Devices, subclasses 115+ for inductor
structures having relatively movable coils.
Subclass:
63
This subclass is indented under subclass 61. Subject matter
in which a plurality of coils or windings are so arranged as
to have a core common to all the coils or winding with the
core, when moved, causing the inductance of each of the
plural coils or windings to vary simultaneously.
(1) Note. A single winding of wire having a plurality of
tap connections, each of which is adapted to be connected to
different circuits, is considered formed by a plurality of
coils connected together to form a single winding or coil and
is properly classified in this subclass if the coils have a
common core for adjusting the inductance value of the coils.
SEE OR SEARCH CLASS:
336, Inductor Devices, subclass 118 and 130+ for inductor
device structures having relatively movable core and coils.
343, Communications: Radio Wave Antennas, subclass 748 for
loop type antennae with a variable reactance for tuning the
antenna.
Subclass:
64
This subclass is indented under the class definition. Subject
matter wherein the inductor and capacitor are electrically
connected in series so as to form a tuner of the series
resonant type, the impedance of the resulting two terminal
series network being a minimum at resonance.
Subclass:
65
This subclass is indented under the class definition. Subject
matter in which at least an inductor and capacitor are
electrically connected together to form a parallel tuned
circuit, both the inductor and capacitor being of the
continuously variable type.
(1) Note. A variable capacitor connected to an inductor
which is varied by switching the inductor or a portion
thereof, into or out of a circuit is not classified in this
subclass but is found in subclasses 47+ above. Also, a
variable inductor connected to fixed capacitors which are
switched into or out of a circuit is found in subclasses 47+
above. Note particularly subclasses 55 and 56+.
SEE OR SEARCH THIS CLASS, SUBCLASS:
64 for series tuned circuits which may have both a variable
inductor and capacitor.
SEE OR SEARCH CLASS:
74, Machine Element or Mechanism, subclasses 10+ for drive
means for a tuner which may be operating a variable inductor
and/or capacitor.
336, Inductor Devices, appropriate subclasses for inductor
structure, per se.
361, Electricity: Electrical Systems and Devices, subclasses
271+ for capacitor structure, per se. See also the Search
Notes to this subclass for a complete field of search as to
capacitors.
Subclass:
66
This subclass is indented under subclass 65. Subject matter
wherein the inductor and capacitor of the tuned circuit have
a common mutually variable inductance and capacitance
structure, the adjustment of which effects both the
inductance and capacitance value of the tuned circuit
simultaneously.
(1) Note. A mutually variable adjustment element is limited
to an element in common with both the inductor and capacitor
that causes simultaneous variations in the respective
reactance characteristics of both the inductor and
capacitor.
SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 69+ for tuners in which the inductor and
capacitor are simultaneously varied, but wherein the inductor
and capacitor have no reactance structure in common.
Subclass:
67
This subclass is indented under subclass 66. Subject matter
wherein the tuner includes a tuning unit having a variable
capacitor type configuration with the self inductance of the
mechanical structure of the capacitor and the capacitance of
the capacitor forming a tuned circuit, the rotational
displacement of the rotor of the variable capacitor
simultaneously varying both the capacitance and the
inductance of the unit.
(1) Note. Butterfly tuners generally consists of a pair of
capacitor stators of generally quadrantal shape, a complete
annular band surrounding and supporting the stators and
forming parallel inductive paths between the capacitor
stators, and a rotor having elements in capacitative relation
to the stator and in inductive relation to the band and
movable to vary both the capacitance and the inductance of
the unit.
(2) Note. Semibutterfly and coaxial butterfly tuners are
properly classified in this subclass.
SEE OR SEARCH CLASS:
331, Oscillators, subclass 95 for oscillators having a
butterfly resonator circuit.
Subclass:
68
This subclass is indented under subclass 66. Subject matter
wherein the tuning element which is mutually common to both
the inductor and capacitor portion of the parallel tuned
circuit is movable rectilinearly in respect to the inductor
and capacitor.
Subclass:
69
This subclass is indented under subclass 65. Subject matter
wherein the inductor and capacitor are so constructed or
mechanically connected together that simultaneous variation
of the inductance and capacitance values occurs when the
tuner is adjusted or tuned.
SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 41+ for tuners in which the inductance and
capacitance is of the distributed parameter type and in which
the inductance and capacitance may be varied simultaneously
in discrete increments.
subclasses 66+ for tuners with variable inductor and
capacitor structure in common.
Subclass:
70
This subclass is indented under subclass 69. Subject matter
wherein the variable inductor element is of the adjustable
core type.
SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 74+ for tuners in which the capacitor is fixed
and the inductor is of the adjustable core type.
SEE OR SEARCH CLASS:
336, Inductor Devices, subclasses 117+ and 130+ for the
structure of inductors having a relatively movable core.
Subclass:
71
This subclass is indented under the class definition. Subject
matter wherein a parallel tuned circuit consists of a
capacitor of fixed capacitance value and a variable inductor,
the inductance value of which may be varied over a given
range in order to tune the the circuit over a range or band
of frequencies.
(1) Note. To be properly classified in this subclass, the
inductor must be of a variable type. If fixed inductors are
switched into or out of a tuned circuit to thereby vary the
frequency, classification is not in this subclass but in
subclasses 56+ above.
SEE OR SEARCH THIS CLASS, SUBCLASS:
4 for tuners having an inductor which may be varied by an
external magnetic field.
subclasses 12+ for tuning units having a saturable core
type inductor which are directly responsive to voltage and/or
current variation.
38 for tuners having an inductance which is varied by
winding or unwinding the inductor coil.
subclasses 56+ for tuned circuits using fixed inductors
which are switched into or out of circuit to thus vary the
resonance frequency of the circuit.
subclasses 61+ for tuners having mutual inductance variable
means.
subclasses 65+ for tuners where both the inductor and
capacitor are variable.
SEE OR SEARCH CLASS:
29, Metal Working, subclass 602.1 for methods of making
helical or wound inductance devices involving metal working
and assembly.
72, Metal Deforming, subclass 66 and 135+ for a method of or
apparatus for coiling metal.
74, Machine Element or Mechanism, subclasses 10+ for drive
means for a shaft operated radio tuner which may be operating
a variable inductor.
174, Electricity: Conductors and Insulators, subclass 138
for insulators, per se, upon which an inductor may be wound.
219, Electric Heating, subclasses 600+ for induction
heating devices.
242, Winding, Tensioning, or Guiding, subclasses 430+ for a
process or apparatus for forming an article (e.g., an
inductor, capacitor, or resistor) by winding material onto a
core and subclasses 118+,159+, and 600+ for a spool for
receiving wound material.
323, Electricity: Power Supply or Regulation Systems,
subclass 255 and 340 for adjustable or variable inductor
device systems.
331, Oscillators, subclasses 167+ for L-C type oscillators
generally and subclass 181 for variable inductance tuned
oscillators. See also the Search Notes under these
subclasses.
336, Inductor Devices, appropriate subclass for the structure
of inductor devices, per se.
338, Electrical Resistors, subclasses 283+ for zigzag or
sinuous resistance elements and subclasses 296+ for helical
or wound resistance elements.
Subclass:
72
This subclass is indented under subclass 71. Subject matter
wherein a movable contact is adjustable along the length of
the inductor element to thereby vary the effective inductance
of the inductor and thus tune the circuit over a range or
band of frequency.
(1) Note. The contact does not necessarily have to make
physical contact with the inductance winding but may be
capacitively coupled thereto. If capacitor type contacts are
present classification is indented subclass 73 below.
(2) Note. When the contact is stationary and the inductor
element movable, classification is not in this subclass but
in subclass 71 above.
SEE OR SEARCH CLASS:
336, Inductor Devices, subclasses 139+ for variable
inductor devices having a contact which follows a helical
conductor, and subclass 149 for inductors having a contact
slidable on the coil winding.
338, Electrical Resistors, subclasses 118+ for a variable
resistor having a contact which moves along the length of a
resistance element.
Subclass:
73
This subclass is indented under subclass 72. Subject matter
in which the movable contact element does not come into
direct electrical contact with the inductor coil but is
capacitively coupled thereto.
(1) Note. Usually there is an insulative coating between
the movable contact and the coil windings thus preventing the
contact from making direct electrical contact with the coil.
The contact surface usually serves as one plate of a
capacitor with the coil of the inductor serving as the second
capacitor plate. Electrical energy is transferred between
these capacitor plates.
Subclass:
74
This subclass is indented under subclass 71. Subject matter
wherein the frequency of the tuned circuit is varied by
moving a core of material in the magnetic or the electric and
magnetic field of an inductor element.
(1) Note. The core of material used to tune the tuned
circuit is not restricted to any particular shape but may be
of any desired configuration.
SEE OR SEARCH THIS CLASS, SUBCLASS:
70 for core tuned inductors in which both the capacitance
and inductance of the tuned circuit are simultaneously
varied.
SEE OR SEARCH CLASS:
330, Amplifiers, subclass 169 for amplifiers having
transformer coupling including means for adjusting inductive
coupling of transformer.
336, Inductor Devices, subclasses 117+ and 130+ for
inductors having a relatively movable core and coil.
343, Communications: Radio Wave Antennas, subclass 748 for
loop type antennae with a variable reactance (e.g.,
adjustable core) for tuning the antenna.
Subclass:
75
This subclass is indented under subclass 74. Subject matter
wherein the inductor is formed and/or wound in an irregular
or varying configuration as, for example, a tapered winding.
(1) Note. Inductors formed by coating a strip of conductive
material upon a coil form in an irregular or varying
configuration are properly classified in this subclass.
SEE OR SEARCH CLASS:
29, Metal Working, subclass 602.1 for methods of making
helical or wound inductance devices involving metal working
and assembly.
174, Electricity: Conductors and Insulators, subclass 138
for insulators, per se, upon which an inductor may be wound.
242, Winding, Tensioning, or Guiding, subclasses 430+ for a
process or apparatus for forming an article (e.g., an
inductor, capacitor, or resistor) by winding material onto a
core and subclasses 118+, 159+, and 600+ for a spool for
receiving wound material.
336, Inductor Devices, subclass 200 for printed circuit type
coils and subclasses 225+ for the structure of inductor coils
of special configuration.
338, Electrical Resistors, subclasses 283+ for zigzag or
sinuous resistance elements and subclasses 296+ for helical
or wound resistance elements.
Subclass:
76
This subclass is indented under subclass 74. Subject matter
wherein the core is of a particular shape and/or constructed
out of a particular type material or materials.
(1) Note. Cores having particular physical dimensions are
properly classified in this subclass.
SEE OR SEARCH CLASS:
336, Inductor Devices, subclasses 233+ for cores used in
inductance devices. Also see Search Notes under this
subclass for a complete field of search on core structure and
materials.
Subclass:
77
This subclass is indented under subclass 74. Subject matter
wherein a plurality of variable inductor tuners of the
adjustable core type are so constructed and/or mechanically
interlinked as to move in unison thereby adjusting together
the respective tuning cores of each tuned circuit.
SEE OR SEARCH CLASS:
333, Wave Transmission Lines and Networks, subclasses 24+
for coupling networks including plural coils and plural
cores, and particularly indented subclasses 177+ for
transformer coupling wave filters with magnetic core
inductance.
336, Inductor Devices, subclasses 131+ for plural coils
having plural movable cores which may be adjusted in unison.
338, Electrical Resistors, subclasses 130+ for ganged
resistor elements.
Subclass:
78
This subclass is indented under the class definition. Subject
matter wherein a parallel tuned circuit consists of an
inductor of fixed inductance value and a tuning capacitor,
the capacitance value of which may be varied over a given
range in order to tune the circuit over a range or band of
frequencies.
(1) Note. To be properly classified in this subclass, the
capacitor must be of a variable type. If fixed capacitors
are switched into and out of a tuned circuit to thereby vary
the frequency, classification is not in this subclass but in
subclass 55 above.
SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 11+ for voltage and/or current responsive tuning
elements which may be capacitors.
45 for distributed parameter type tuners which use a lumped
capacitor which may be variable.
51 for turret tuners of the switching drum type having
vernier tuning means which may be a variable capacitor.
55 for tuned circuits using fixed capacitors switched in or
out of the circuit.
58 for switched inductor structures provided with vernier
variable capacitor means.
64 for series tuned circuits which may use a variable
capacitor.
subclasses 65+ for tuners where both the inductor and
capacitor are variable.
SEE OR SEARCH CLASS:
74, Machine Element or Mechanism, subclasses 10+ for drive
means for a shaft operated radio tuner which may be operating
a variable capacitor.
331, Oscillators, subclasses 167+ for L-C type oscillators
generally. See also the Search Notes under this subclass for
L-C type oscillator circuits generally.
361, Electricity: Electrical Systems and Devices, subclasses
268+ for a transformer or inductor combined with a
capacitor, and subclasses 271+ for capacitors, per se,
particularly indented subclasses 277+ for variable
capacitors. See also the Search Notes under this subclass
for a complete field of search as to capacitors.
Subclass:
79
This subclass is indented under subclass 78. Subject matter
comprising a tuner having a variable capacitor which is so
constructed and/or driven by an adjusting means that if the
frequency variation or change produced in the tuner by the
adjustment of the variable capacitor is plotted along the
abscissa and the movement or variation of the variable
capacitor is plotted along the ordinate of a graph, the line
produced would be linear.
(1) Note. Straight line frequency variation as found in
this subclass may be obtained by proper design of the profile
or cross section of the plates of the condenser, or of the
cam or other equivalent driving devices, or by proper
combinations of variable and fixed capacitors.
SEE OR SEARCH THIS CLASS, SUBCLASS:
82 for tuners wherein the capacitor plates are arranged in a
particular manner or have a particular shape.
Subclass:
80
This subclass is indented under subclass 78. Subject matter
in which the variable capacitor is so constructed that the
spacing between the plates of the capacitor may be varied to
thus change the capacitance of the capacitor as, for example,
by placing a series of resiliently biased stacked plates
under a variable pressure.
Subclass:
81
This subclass is indented under subclass 78. Subject matter
wherein the variable capacitor is of the sliding plate type
which variably interleaves in a rectilinear manner.
SEE OR SEARCH THIS CLASS, SUBCLASS:
73 for variable inductor tuners which have a capacitor type
contact which usually moves rectilinearly along a coil
winding.
SEE OR SEARCH CLASS:
361, Electricity: Electrical Systems and Devices, subclass
296 for capacitors of the rectilinearly slidable plate
type.
Subclass:
82
This subclass is indented under subclass 78. Subject matter
in which the variable capacitor plates are shaped and/or
arranged in a particular or special manner to give a special
tuning operation.
SEE OR SEARCH THIS CLASS, SUBCLASS:
79 for variable capacitors which are designed to give a
linear frequency versus capacitor setting tuning curve and
which may be of a special shape and/or arrangement.
Subclass:
83
This subclass is indented under subclass 78. Subject matter
wherein two or more variable capacitors are mechanically
interlinked to move in unison.
SEE OR SEARCH CLASS:
338, Electrical Resistors, subclass 130 for plural
mechanically variable resistors which are gang operated, the
means of interlinking variable resistors being analogous to
that used in connecting together plural capacitors.
361, Electricity: Electrical Systems and Devices, subclass
299.1 for plural variable capacitors of the rotary plate
type which may be ganged together.
Subclass:
84
This subclass is indented under subclass 78. Subject matter
wherein the variable capacitor has a significant operating or
driving means such as, for example, a gear train or cam
operator.
SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 17+ for tuning units which may use a variable
capacitor which is driven or adjusted by an electromagnetic
operator.
SEE OR SEARCH CLASS:
74, Machine Element or Mechanism, subclasses 10+ for
assemblies particularly adapted for mechanically rotating one
or more shafts of electronic tuning devices into desired
angular positions. See also the Search Notes under this
subclass for a complete field of search on driving
assemblies.
Subclass:
85
This subclass is indented under the class definition. Subject
matter wherein the tuner device is substantially completely
covered or surrounded by an enclosure and/or a barrier or
screen is present for shielding at least a part of the tuner
device from external electrical, magnetic or electromagnetic
fields, or for protecting part of the tuner device from such
fields originating in another part of the circuit, or for
preventing the tuner device from emanating such fields or
waves containing such fields.
SEE OR SEARCH CLASS:
174, Electricity: Conductors and Insulators, subclasses 35+
for electrically shielded electrical conductors and
insulators; or electrical shields or screens not classifiable
in other subclasses of this class, and subclasses 50+ for
electrical boxes and houses, per se. Also see the Search
Notes under these subclasses for an additional field of
search.
336, Inductor Devices, subclasses 84+ for inductor devices
with electric and/or magnetic shielding means, and subclasses
90+ for housings for inductors.
338, Electrical Resistors, subclasses 64+ for resistors
having electrical shield, and subclasses 226+ for incased,
embedded or housed resistor devices. See also the Search
Notes under subclass 226 for a complete field of search on
housings.
455, Telecommunications, appropriate subclasses.
Subclass:
86
This subclass is indented under the class definition.
Mechanisms which include a device for conveying information
as the particular band or position within a band of
frequencies to which a tuned circuit is adjusted. Usually
the indicator is pointer and scale type which is attached to
the movable shaft of an adjustable tuner unit.
SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 30+ for circuits which indicate when a tuner is
properly adjusted to resonance as, for example, the tuning in
of a particular radio signal.
SEE OR SEARCH CLASS:
40, Card, Picture, or Sign Exhibiting, appropriate
subclasses, for card, picture or sign exhibits, either
stationary or which may be made to appear at windows or
apertures. This class provides for means used for displaying
information. The information that is displayed may be the
position or band of frequencies to which a tuner is
adjusted.
74, Machine Element or Mechanism, subclasses 10+ for
assemblies particularly adapted to rotate one or more shafts
of an electronic tuning device and which may also include
mechanical dial operators.
116, Signals and Indicators, subclasses 241+ for position
indicating means of the visual type.
250, Radiant Energy, subclass 250 for wave meters.
336, Inductor Devices, subclass 45 for transformers and
inductive reactors having a movable element and a position or
extent of motion indicator.
340, Communications: Electrical, appropriate subclasses, for
electrically actuated or controlled signals and indicators,
especially subclass 870.01 for telemetric systems.
361, Electricity: Electrical Systems and Devices, subclass
300 for a capacitor having an indicating means.
362, Illumination, appropriate subclasses for light combined
with other structure, and especially subclasses 23+ for
dial illumination.
Subclass:
87
This subclass is indented under subclass 86. Subject matter
in which the indicator is adapted to indicate in which band
of frequencies a tuner is operating where the tuner is of the
type which is adapted to cover a plurality of such bands.
(1) Note. An example of the type of indicator found in this
class is a television channel indicator.
Subclass:
88
This subclass is indented under the class definition. Subject
matter in which means, such as a detent or electrical braking
circuit, is provided to check or arrest the motion of the
tuner adjusting shaft or device at a preset position or at a
given time.
SEE OR SEARCH THIS CLASS, SUBCLASS:
subclasses 17+ for tuners driven by an electromagnetic
operator and so constructed as to scan a band of frequencies
and stop on a given signal within that band of frequencies.
A signal seeking tuner is an example of the type of unit
found in this group of subclasses.
subclasses 30+ for circuits which indicate when a tuner is
properly adjusted to resonance as, for example, the tuning in
of a particular radio signal.
subclasses 86+ for tuners having an indicator or dial to
show the position or degree of movement of the tuner drive
means.
SEE OR SEARCH CLASS:
74, Machine Element or Mechanism, subclass 10.41 for shaft
operated preselected position devices having detent or
clicker means, and subclasses 527+ for detents, per se.
192, Clutches and Power-Stop Control, subclass 116.5 for
mechanisms for stopping a machine when a preset condition
occurs.
Subclass:
89
This subclass is indented under the class definition. Subject
matter which is not provided for in any of the preceding
subclasses in this class and which is not otherwise
classified.
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
Last Modified: 6 October 2000