U.S. PATENT AND TRADEMARK OFFICE
Information Products Division |
U.S. Patent Classification System - Classification Definitions
as of June 30, 2000
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Electronic Products Branch)
Class 365
STATIC INFORMATION STORAGE AND RETRIEVAL
Class Definition:
This is the generic class for apparatus or corresponding
processes for the static storage and retrieval of
information. For classification herein, the storage system
must be (1) static, (2) a singular storage element or plural
elements of the same type, (3) addressable.
(1) Note. Static storage and retrieval of information
within this class means that relative motion is not required
between the storage element and the source, receiver, or
transducer. For dynamic storage and retrieval or magnetic
information, see References to Other Classes, below.
(2) Note. The storage elements within this class are plural
elements of the same type which may store one or more bits of
information per element.
(3) Note. The storage system must be addressable, that is,
there must be an inherent means for writing information into
a memory and a means for reading the same information from
the memory. For switching systems, selective systems, card
readers, and recorders, see References to Other Classes,
below. Static memory systems involving data processing
techniques are classified elsewhere.
LINES WITH OTHER CLASSES AND WITHIN THIS CLASS
A. This class includes static memory systems wherein the
information stored in the memory element has electrical,
magnetic, or optical properties. This class excludes
mechanical or fluidic type storage of information, e.g., card
files, cams, levels, or fluids, etc. This class also excludes
the storage of noninformation, e.g., energy, basic signal
control means, etc.
B. Processes for the manufacturing of storage elements are
not classified within this class. See appropriate classes in
References To Other Classes, below.
C. Storage Signals, per se, are not classified herein. (See
appropriate classes in the References To Other Classes,
below.)
D. Circuits not specific to storage and retrieval which may
constitute subcombinations of such apparatus are classified
in the appropriate class for such circuits, e.g.,
photosensitive devices. See References to Other Classes,
below.
E. The combination of the subject matter of this class and
an art environment is classified with the art environment.
F. For static storage and retrieval systems, devices, and
arrangements found in other classes: see appropriate classes
in Reference To Other Classes, below.
G. The organization of this class can be found in Subclass
References to the Current Class, below.
SEE OR SEARCH THIS CLASS, SUBCLASS:
1 through 44, for magnetic bubble devices.
45 48, analog storage systems, for devices where the
information stored is not digital in nature.
49 through 243.5, digital storage systems, for devices where
the information is discrete.
244 for subject matter not found above.
REFERENCES TO OTHER CLASSES
SEE OR SEARCH CLASS:
29, Metal Working, for method of assembling storage elements.
(See Lines With Other Classes, Section B.)
29, Metal Working, subclass 25.35 for method of making
piezoelectric devices, subclass 737 for apparatus to assemble
magnetic memory devices, subclasses 25.01+ for making of
barrier layer device, subclasses 592.1+ for processes of
mechanical manufacturing electrical devices. (See Lines With
Other Classes F.)
74, Machine Element or Mechanism, 568 for mechanical storage
elements. (See Lines Other Classes, F.)
148, Metal Treatment, for metal stock materials usable as
storage elements. (See Lines With Other Classes, B.)
156, Adhesive Bonding and Miscellaneous Chemical Manufacture,
for bonding together storage element materials. (See Lines
With Other Classes, B.)
174, Electricity: Conductors and Insulators, 250 for
printed circuit elements which are storage panels. (See
Lines With Other Classes, F .)
178, Telegraphy, subclass 112 for static information stored
in the form of a perforated tape. (See Lines With Other
Classes, F.)
194, Check-Actuated Control Mechanisms, mechanical storage of
a check. (See Lines With Other Classes, F.)
205, Electrolysis: Processes, Compositions Used Therein, and
Methods of Preparing the Compositions, subclass 68 for
process of record matrix forming. (See Lines With Other
Classes, F.)
209, Classifying, Separating, and Assorting Solids, 212 for
separating components by magnetic repulsion wherein a
magnetic pin position may be indicative of information. (See
Lines With Other Classes, F.)
235, Registers, 435 for card readers.
235, Registers, 435 for coded record sensors, subclass 493
for magnetic records. (See Lines With Other Classes, F.)
250, Radiant Energy, subclass 550 for holos:graphic
interference pattern analysis, subclass 553 for a matrix of
solid-state light sources. (See Lines With Other Classes,
F.)
250, Radiant Energy, for radiant energy. (See Lines With
Other Classes, D, above.)
252, Compositions, 62.51 for magnetic compositions used as a
storage medium. (See Lines With Other Classes, F.)
257, Active Solid-State Devices (e.g., Transistors,
Solid-State Diodes), appropriate subclasses, including
subclass 225, 260, 390, 391, 903, 904, and 910 for
solid-state static memory or memory element structure, per
se. (See Lines With Other Classes, C.)
257, Active Solid-State Devices (e.g., Transistors,
Solid-State Diodes), appropriate subclasses, including
subclass 225, 260, 390, 391, 903, 904, and 910 for
solid-state static memory or memory element structure. (See
Lines With Other Classes, F.)
307, Electrical Transmission or Interconnection Systems, 401
for saturable reactor systems which include thin film
parametrons, logic circuits, electrets, per se, which are
switching type devices, rather than storage of information
devices and subclass 109 for systems having a capacitor.
(See Lines With Other Classes, F.)
307, Electrical Transmission or Interconnection Systems, 112
for switching systems.
310, Electrical Generator or Motor Structure, 311 for
piezoelectric device, F).
313, Electric Lamp and Discharge Devices, for a cathode-ray
tube (CRT) type storage tube. (See Lines With Other
Classes, C.)
313, Electric Lamp and Discharge Devices, 391 for
cathode-ray tube storage devices. (See Lines With Other
Classes, F.)
315, Electric Lamp and Discharge Devices: Systems, for a CRT
type storing system. (See Lines With Other Classes, C.)
315, Electric Lamp and Discharge Devices: Systems, subclass
8.51 for cathode-ray tube storing systems, subclass 84.51
for discharge device systems which store electrical pulse
energy for later retrieval. (See Lines With Other Classes,
F.)
320, Electricity: Battery or Capacitor Charging or
Discharging, 166 for a battery or capacitor charging or
discharging circuit. (See Lines With Other Classes, F.)
324, Electricity: Measuring and Testing, 43 for magnetic
field testing means, subclasses 111+ for storage of voltages
and currents; and subclasses 210+ for testing of magnetic
memory elements, per se. (See Lines With Other Classes, F.)
326, Electronic Digital Logic Circuitry, appropriate
subclasses for digital logic devices. (See Lines With Other
Classes, F.)
326, Electronic Digital Logic Circuitry, for logic circuits.
(See Lines With Other Classes, D, above.)
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, 545 for miscellaneous bias circuits
with signal protection or bias preservation. (See Lines With
Other Classes, C.)
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, particularly 199 for miscellaneous
bistable circuits and subclasses 365+ for miscellaneous
gating circuits. (See Lines With Other Classes, F.)
330, Amplifiers, 4 for laser type amplifiers having utility
in information storage. (See Lines With Other Classes, F.)
330, Amplifiers, for amplifiers. (See Lines With Other
Classes, D, above.)
333, Wave Transmission Lines and Networks, subclass 4 for
plural channel systems with balanced circuits, subclasses
124+ for impedance matching devices, subclass 12 for
transmission lines, subclasses 138+ for delay means, subclass
32 for coupling means which include impedance matching means,
subclasses 170+ for wave filters with bridge means,
subclasses 213+ for negative resistance networks. (See Lines
With Other Classes, F.)
335, Electricity: Magnetically Operated Switches, Magnets,
and Electromagnets, 209 for magnets and electromagnets, per
se. (See Lines With Other Classes, F.)
336, Inductor Devices, for an inductor type storage element.
(See Lines With Other Classes, C.)
336, Inductor Devices, appropriate subclass for storage
element which are inductors. (See Lines With Other Classes,
F.)
338, Electrical Resistors, subclass 32 for superconductors,
per se, having utility as a storage element. (See Lines With
Other Classes, F.)
340, Communications: Electrical, subclass 825 for selective
systems.
340, Communications: Electrical, for code converters. (See
Lines With Other Classes, D, above.)
340, Communications: Electrical, subclass 146.2 for digital
comparator systems, subclass 347 for code converters,
subclasses 825.79+ for selective matrix systems which are
used to control a device. (See Lines With Other Classes,
F.)
345, Computer Graphics Processing, Operator Interface
Processing, and Selective Visual Display Systems, 55 for
display elements arranged in matrix. (See Lines With Other
Classes, F.)
346, Recorders, appropriate subclass for recorders. Static
memory systems involving data processing techniques are
classified elsewhere
346, Recorders, 2 for phenomenal apparatus and processes
recording for processes of producing a record in conjunction
with the reading of a record, subclasses 74.2+ for
magnetically forming a visible image record. (See Lines With
Other Classes, F.)
347, Incremental Printing of Symbolic Information, 1 for
processes and apparatus for conveying information by
selectively creating on a medium a visibly distinguishable
symbol or mark composed of a plurality of portions; subclass
113 for thermoplastic marking. (See Lines With Other
Classes, F.)
348, Television, 714 for details of static storage device
which includes the processing of a video signal.
353, Optics: Image Projectors, 25 for selective data
retrieval of stored information viewed by a projection means.
(See Lines With Other Classes, F.).
358, Facsimile and Static Presentation Processing, subclass
296 for facsimile recording. (See Lines With Other Classes,
F.)
359, Optics: Systems (Including Communication) and Elements,
350 for infrared and ultraviolet optical elements,
subclasses 1+ for holos:graphic records, subclasses 483+ for
polarization devices, subclasses 290+ for light control by
altering an optical medium, surface, or interface. (See
Lines With Other Classes, F.)
359, Optics: Systems (Including Communication) and Elements,
for holos:graphic, polarization, and light control type
storage elements. (See Lines With Other Classes, C.)
359, Optics: Systems (Including Communication) and Elements
for optical elements. (See Lines With Other Classes, D,
above.)
360, Dynamic Magnetic Information Storage or Retrieval,
subclass 112, 313-327.33, 328, and 114 for Hall effect,
magnetoresistive, magnetostrictive, and magneto-optic
devices, respectively.
360, Dynamic Magnetic Information Storage or Retrieval, for
dynamic storage and retrieval or magnetic information.
(Class Definition, General Statement of the Class Subject
Matter)
361, Electricity: Electrical Systems and Devices, for
capacitor type storage element. (See Lines With Other
Classes, C.)
361, Electricity: Electrical Systems and Devices, 160 for
control circuits for relay devices, subclass 271 for
electrostatic capacitors, per se, subclass 600 for housings
or mounting assemblies with plural diverse electrical
components, subclasses 500+ for electrolytic capacitors, per
se. (See Lines With Other Classes, F.)
369, Dynamic Information Storage or Retrieval, for phonograph
with a static storage system. (See Lines With Other Classes,
E.)
369, Dynamic Information Storage or Retrieval, appropriate
subclasses, subclass 100.1 for the dynamic recording of
audio information which may include static storage,
particularly subclasses 100+ for photos:graphic storage of
information. (See Lines With Other Classes, F.)
370, Multiplex Communications, for a multiplex system which
include static storage of information. (See Lines With Other
Classes, E.)
370, Multiplex Communications, 351 for pathfinding or
routing, and subclass 531 for magnetic core for storage in
multiplex communications which may include a static memory
device. (See Lines With Other Classes, F.)
372, Coherent Light Generators, appropriate subclasses for
laser type oscillators having utility in information storage.
(See Lines With Other Classes, Section F.)
377, Electrical Pulse Counters, Pulse Dividers, or Shift
Registers: Circuits and Systems, for electrical counters and
shift registers. (See Lines With Other Classes, F.)
399, Electrophotography, subclass 10 for storage of data on
the operation of an electrophotos:graphic device (i.e., log
report) and subclass 83 for job mode selection with memory.
(See Lines With Other Classes, F.)
420, Alloys or Metallic Compositions. (See Lines With Other
Classes, B.)
427, Coating Processes, for coating of storage element
materials. (See Lines With Other Classes, B.)
427, Coating Processes, subclass 62, 82, and 100 for
superconductor, semiconductor, and piezoelectric products
produced, respectively, subclasses 127+ for magnetic base or
coating processes. (See Lines With Other Classes, F.)
430, Radiation Imagery Chemistry: Process, Composition, or
Product Thereof, appropriate subclasses for radiation imagery
chemistry process, composition, or product used as a storage
medium. (See Lines With Other Classes, F.)
434, Education and Demonstration, educational devices which
may include the storage and retrieval of information. (See
Lines With Other Classes, F.)
438, Semiconductor Device Manufacturing: Process, for
methods of making semiconductor devices. (See Lines With
Other Classes, B.)
438, Semiconductor Device Manufacturing: Process, for
methods of making semiconductor devices. (See Lines With
Other Classes, F.)
505, Superconductor Technology: Apparatus, Material,
Process, 150 for high temperature (T[subscrpt]c[end
subscrpt] 30 K) superconducting devices, particularly
subclasses 170+ for static information storage or retrieval.
(See Lines With Other Classes, F.)
706, Data Processing: Intelligent Processing Systems and
Methods, subclass 44 for simulating operational functions of
living nerve cells.
711, Electrical Computers and Digital Processing Systems:
Memory, 1 for addressing combined with specific memory
configurations (e.g., extended, expanded, dynamic, etc.),
subclasses 100+ for generalized address forming, and
subclasses 200+ for generalized storage accessing and control
in a digital data processing system. (See Lines With Other
Classes, E.)
714, Error Detection/Correction and Fault Detection/Recovery,
718 for diagnostic testing of a memory system and subclasses
763+ for digital data error correction during memory access.
(See Lines With Other Classes, F.)
SUBCLASSES
Subclass:
1
MAGNETIC BUBBLES:
This subclass is indented under the class definition.
Subject matter where the information stored in a magnetic
medium is a domain bubble (a single walled magnetic domain
having an outer boundary which closes on itself and has a
geometry independent of the boundary of the sheet in which it
moves, usually in the form of a cylinder).
SEE OR SEARCH THIS CLASS, SUBCLASS:
29 where the information stored is in the form of a strip.
Subclass:
2
Disposition of elements:
This subclass is indented under subclass 1. Subject matter
directed to the physical or spatial arrangement, packaging,
or chip orientation of the magnetic bubbles.
SEE OR SEARCH CLASS:
29, Metal Working, subclass 737 for the assembly and
disassembly apparatus of a bubble domain device, subclass 604
for the process of mechanical manufacture of a bubble domain
device.
359, Optics: Systems (Including Communication) and Elements,
subclass 228 for ferro fluid magnetic bubble.
360, Dynamic Magnetic Information Storage or Retrieval, 110
for a domain bubble used as a transducer, subclasses 131+ for
a domain bubble stored on a dynamic record.
Subclass:
3
Lattice:
This subclass is indented under subclass 2. Subject matter
where the bubble lattice consists of a plurality of rows and
columns of bubble domains which occupy a spatial arrangement
which is determined to a substantial extent by the
interaction between the bubbles.
Subclass:
4
Decoder:
This subclass is indented under subclass 1. Subject matter
having means to translate one bubble code to another.
SEE OR SEARCH CLASS:
340, Communications: Electrical, subclass 347 for
translating analog to digital, digital to analog, or digital
to digital.
Subclass:
5
Logic:
This subclass is indented under subclass 1. Subject matter
wherein a logic function is performed by the bubble domain
device.
Subclass:
6
Rotating field circuits:
This subclass is indented under subclass 1. Subject matter
wherein drive circuits provide rotating in-plane magnetic
fields in field accessed bubble domain devices.
(1) Note. This subclass also includes rotating field coil
arrangement and structure.
SEE OR SEARCH CLASS:
331, Oscillators, for oscillating drive circuits, per se.
Subclass:
7
Detectors:
This subclass is indented under subclass 1. Subject matter
where magnetic flux representing the bubble domain
information is detected or sensed.
SEE OR SEARCH CLASS:
324, Electricity: Measuring and Testing, 34 for magnetic
testing.
329, Demodulators, appropriate subclasses for demodulating
elements whose resistance or reactance changes in response to
an applied magnetic field.
Subclass:
8
Magnetoresistive:
This subclass is indented under subclass 7. Subject matter
where the detector includes an element exhibiting a
magnetoresistive effect and that element and its associated
effect is used to detect or sense magnetic flux from a bubble
domain.
SEE OR SEARCH CLASS:
324, Electricity: Measuring and Testing, subclass 46 for
determining the characteristics of a magnetic field by a
field responsive resistance.
329, Demodulators, appropriate subclasses for demodulating
elements whose resistance or reactance changes in response to
an applied magnetic field.
335, Electricity: Magnetically Operated Switches, Magnets,
and Electromagnets, subclass 215 for magnetostrictive type
devices.
Subclass:
9
Hall effect:
This subclass is indented under subclass 7. Subject matter
where the detector includes an element exhibiting Hall effect
and that element and its associated effect is used to detect
or sense magnetic flux from a bubble domain.
SEE OR SEARCH CLASS:
324, Electricity: Measuring and Testing, subclass 45 for
determining the characteristics of a magnetic field utilizing
the Hall effect.
329, Demodulators, appropriate subclasses for demodulating
elements whose resistance or reactance changes in response to
an applied magnetic field.
Subclass:
10
Optical:
This subclass is indented under subclass 7. Subject matter
wherein the intensity of the flux emanating from the bubble
information is determined by directing a beam of polarized
light at the information location and detecting the rotation
of polarization caused by the flux from a bubble domain.
SEE OR SEARCH CLASS:
359, Optics: Systems (Including Communication) and Elements,
281 and 484 where the properties of the polarized light beam
are changed as a result of a magnetic field.
Subclass:
11
Generators:
This subclass is indented under subclass 1. Subject matter
where the bubble domain is generated or nucleated.
(1) Note. This subclass includes the generation or
nucleation of a bubble domain by a beam of polarized light.
Subclass:
12
By splitting:
This subclass is indented under subclass 11. Subject matter
where the bubble domain is generated by splitting
(replication) an already existing bubble domain.
Subclass:
13
Plural interacting paths:
This subclass is indented under subclass 1. Subject matter
where a plurality of paths or channels containing bubble
domains interact with each other by attraction or repulsion.
Subclass:
14
Closed loop:
This subclass is indented under subclass 13. Subject matter
where the path or channel is in the form of a closed loop.
Subclass:
15
Major-minor:
This subclass is indented under subclass 14. Subject matter
where the path or channel is in the form of a major (main)
loop and minor (auxiliary) loop.
Subclass:
16
With switch at interacting point:
This subclass is indented under subclass 13. Subject matter
where there is a switch (conductor, bubble domain, different
coercivity overlay, overlay spacing, etc.) in the path or
channel for propagating the bubble domain into a particular
path or channel.
Subclass:
17
Idler switch:
This subclass is indented under subclass 16. Subject matter
where the switch is of the idler type where a plurality of
bubble domains are continuously recirculated until one bubble
domain is ejected by an additional bubble domain that has
been injected into the idler switch.
Subclass:
18
Boundary:
This subclass is indented under subclass 13. Subject matter
where the bubble domains interact but never cross the
boundary located between the paths or channels, the paths or
channels may be in the same medium or different mediums.
Subclass:
19
Conductor propagation:
This subclass is indented under subclass 1. Subject matter
where the bubble domains are propagated by energizing
conductors associated with the bubble domains.
Subclass:
20
Including A.C. signal:
This subclass is indented under subclass 19. Subject matter
where at least one of the conductors is energized with an
alternating current (A.C.) signal.
Subclass:
21
Three phase signals:
This subclass is indented under subclass 19. Subject matter
where a sequence of three conductors are energized by signals
120 out of phase.
Subclass:
22
One's and zero's:
This subclass is indented under subclass 1. Subject matter
where the bubble domain information is stored in the medium
by its location in relation to a particular element or
elements (conductor, overlay, path, or channel, etc.) within
the bubble domain device.
Subclass:
23
Plural direction propagation:
This subclass is indented under subclass 1. Subject matter
where a single bubble domain may be propagated in more than a
single direction such as forward and reverse, horizontal to
vertical, or vice versa.
Subclass:
24
Nonsequential:
This subclass is indented under subclass 23. Subject matter
where the direction of propagation is altered by a
nonsequential drive field.
Subclass:
25
Velocity:
This subclass is indented under subclass 1. Subject matter
where the velocity or speed of bubble domain propagation is
significant.
Subclass:
26
Turns:
This subclass is indented under subclass 25. Subject matter
where the turns or corners between paths or channels are
significant.
Subclass:
27
Bias:
This subclass is indented under subclass 1. Subject matter
where a magnetic bias field aids in the propagation of bubble
domains.
(1) Note. Excluded are bias fields used for making the size
of the domain bubbles stable.
Subclass:
28
Variable:
This subclass is indented under subclass 27. Subject matter
where the magnetic bias field is variable.
Subclass:
29
Strip domain:
This subclass is indented under subclass 1. Subject matter
where the bubble domain is elongated into the form of a
strip.
Subclass:
30
In-plane field (nonrotating):
This subclass is indented under subclass 1. Subject matter
where a magnetic field is provided in the direction of the
plane of the magnetic bubble storage medium.
(1) Note. The normal rotating field used for propagating
bubbles is not included.
Subclass:
31
Different size bubbles:
This subclass is indented under subclass 1. Subject matter
where there are different size bubbles in the same medium or
in different mediums.
Subclass:
32
Multiple magnetic layer:
This subclass is indented under subclass 1. Subject matter
where there are a plurality of storage layers or the
combination of a storage layer and a second nonstorage
magnetic layer.
Subclass:
33
Magnetic storage material:
This subclass is indented under subclass 1. Subject matter
where the particular material or composition of the storage
medium is disclosed.
(1) Note. This subclass includes mediums of the isotropic
type.
SEE OR SEARCH CLASS:
252, Compositions, 62.51 for magnetic compositions used as a
storage medium.
Subclass:
34
Amorphous:
This subclass is indented under subclass 33. Subject matter
where the storage medium is of the amorphous type.
Subclass:
35
Guide structure:
This subclass is indented under subclass 1. Subject matter
where there is an element or elements for guiding a bubble
domain along a path or channel, or a guide means outside the
path or channel for confining the bubble domain within a
particular path, channel, or area.
SEE OR SEARCH THIS CLASS, SUBCLASS:
3 for confinement (guide structure) means associated with
lattice arrays.
32 where bubbles in another medium are used to guide the
information bubbles.
Subclass:
36
Ion implantation:
This subclass is indented under subclass 35. Subject matter
where the guide structure is formed by ion implantation.
SEE OR SEARCH CLASS:
427, Coating Processes, 523 for the use of ion plating or
ion implantation.
Subclass:
37
Slots or rails:
This subclass is indented under subclass 35. Subject matter
where the guide structure is a groove or slot in the storage
medium or a rail of permalloy on the surface of the storage
medium.
(1) Note. This subclass includes apertures in the storage
medium.
SEE OR SEARCH THIS CLASS, SUBCLASS:
41 where the guide structure is a permalloy overlay in the
shape of a circular dot or disc.
Subclass:
38
Zigzag:
This subclass is indented under subclass 35. Subject matter
where the guide structure is shaped in a zigzag fashion.
Subclass:
39
Overlays:
This subclass is indented under subclass 35. Subject matter
where an overlay of permalloy is used to guide the bubble
domain along a path or channel.
(1) Note. Not included are common permalloy overlays known
as T-I bars and Y-I bars.
Subclass:
40
On opposite sides of storage medium:
This subclass is indented under subclass 39. Subject matter
where the overlays are on both sides of the storage medium.
Subclass:
41
Dots:
This subclass is indented under subclass 39. Subject matter
where the overlay is in the shape of a dot or disc.
Subclass:
42
Wedges:
This subclass is indented under subclass 39. Subject matter
where the overlay is in the shape of a wedge, also known as
an angelfish.
Subclass:
43
Chevrons:
This subclass is indented under subclass 39. Subject matter
where the overlay is in the shape of a chevron; chevrons are
shaped like sergeant strips.
Subclass:
44
Rectangular bars:
This subclass is indented under subclass 39. Subject matter
where the overlay is in the shape of a rectangular bar.
(1) Note. Not included at I bars associated with common T-I
bars and Y-I bars.
Subclass:
45
ANALOG STORAGE SYSTEMS:
This subclass is indented under the class definition.
Subject matter in which the signal is a direct or analogous
function of the information or intelligence stored.
SEE OR SEARCH CLASS:
315, Electric Lamp and Discharge Devices: Systems, subclass
8.51 for cathode-ray tube (CRT) storage.
320, Electricity: Battery or Capacitor Charging or
Discharging, 166 for capacitor charging or discharging, per
se.
359, Optics: Systems (Including Communication) and Elements,
1 for analog storage systems where there is a holos:graphic
storage medium storing an analog information signal absent
any electrical circuitry.
370, Multiplex Communications, appropriate subclasses for
multiplex switching techniques similar to addressing or the
handling of memory information signals.
Subclass:
46
Resistive:
This subclass is indented under subclass 45. Subject matter
where the storage element is resistive.
SEE OR SEARCH THIS CLASS, SUBCLASS:
148 for digital resistive storage elements.
Subclass:
47
Thermoplastic:
This subclass is indented under subclass 45. Subject matter
where the storage element is thermoplastic.
SEE OR SEARCH THIS CLASS, SUBCLASS:
126 for digital thermoplastic storage elements.
SEE OR SEARCH CLASS:
347, Incremental Printing of Symbolic Information, subclass
113 for electrostatic marking devices in which a latent
image is made visible by applying heat to cause plastic
deformation of a charged medium.
386, Television Signal Processing for Dynamic Recording or
Reproducing, subclass 127 for dynamic thermoplastic
recording of television signal.
Subclass:
48
Magnetic:
This subclass is indented under subclass 45. Subject matter
where the storage element is magnetic.
SEE OR SEARCH CLASS:
399, Electrophotography, subclass 10 for storage of data on
the operation of an electrophotos:graphic device (i.e., log
report) and subclass 83 for job mode selection with memory.
Subclass:
49
ASSOCIATIVE MEMORIES:
This subclass is indented under the class definition.
Subject matter where the information is retrieved based on
content rather than location; associative memories are also
referred to as content or tag memories.
SEE OR SEARCH CLASS:
359, Optics: Systems (Including Communication) and Elements,
1 for associative storage systems where there is a
holos:graphic storage medium storing information absent any
electrical circuitry.
711, Electrical Computers and Digital Processing Systems:
Memory, subclass 108 for content addressable memory in a
memory accessing and control system in a digital data
processing system and subclass 128 for associative memory in
a hierarchical caching memory accessing and control system in
a digital data processing system.
Subclass:
50
Magnetic:
This subclass is indented under subclass 49. Subject matter
where the associative memories storage elements are
magnetic.
Subclass:
51
FORMAT OR DISPOSITION OF ELEMENTS:
This subclass is indented under the class definition.
Subject matter with specific details of the physical or
spatial arrangement of the elements.
SEE OR SEARCH THIS CLASS, SUBCLASS:
52 for hardware associated with storage elements.
63 for wiring paths of storage elements.
SEE OR SEARCH CLASS:
29, Metal Working, 592.1 for the processes of mechanical
manufacture of storage elements.
Subclass:
52
HARDWARE FOR STORAGE ELEMENTS:
This subclass is indented under the class definition.
Subject matter having mechanical components or parts which
assist in the operation of the storage element.
SEE OR SEARCH THIS CLASS, SUBCLASS:
51 for physical arrangement of storage elements.
63 for connections between storage elements.
SEE OR SEARCH CLASS:
174, Electricity: Conductors and Insulators, 50 for
electrical boxes and housings.
361, Electricity: Electrical Systems and Devices, 600 for
hardware and mounting assembly with plural diverse electrical
components.
Subclass:
53
Shields:
This subclass is indented under subclass 52. Subject matter
which includes means associated with the storage device for
reducing or preventing electric or magnetic coupling.
SEE OR SEARCH THIS CLASS, SUBCLASS:
206 for noise suppression.
SEE OR SEARCH CLASS:
307, Electrical Transmission or Interconnection Systems,
subclass 91 for magnetic or electrostatic field control
shielding coupled to other systems.
330, Amplifiers, subclass 170 for interstage coupling with
shielding means.
439, Electrical Connectors, 607 for an electrical connector
having or providing inductive or capacitive shielding.
Subclass:
54
Ground plane:
This subclass is indented under subclass 52. Subject matter
which includes a ground plane as one of the components of the
storage device.
Subclass:
55
Magnetic:
This subclass is indented under subclass 52. Subject matter
wherein the storage device is magnetic.
Subclass:
56
Spacers:
This subclass is indented under subclass 55. Subject matter
which includes means associated with a storage device for
separating storage elements or components of the storage
device.
Subclass:
57
Keeper:
This subclass is indented under subclass 55. Subject matter
which includes a component of the storage device which is
made of highly permeable material and is used to focus or
concentrate the magnetic flux emanating from the storage
device.
Subclass:
58
Slot:
This subclass is indented under subclass 55. Subject matter
where a groove or slot is located within one of the
components of the storage device or the storage element
itself.
Subclass:
59
Embedded conductor:
This subclass is indented under subclass 55. Subject matter
wherein a conductor is embedded within one of the components
of the magnetic device or the magnetic element itself.
Subclass:
60
Air gap:
This subclass is indented under subclass 55. Subject matter
where an air gap or an air gap space filled with a material
which has a permeability of about one is located within the
storage element, within components associated with the device
or between the element and components.
Subclass:
61
Hairpin conductor:
This subclass is indented under subclass 55. Subject matter
where a conductor associated with the storage device has the
general shape of a hairpin.
Subclass:
62
Permanent magnet:
This subclass is indented under subclass 55. Subject matter
where a permanent magnet is used as a component in the
magnetic storage device.
SEE OR SEARCH CLASS:
335, Electricity: Magnetically Operated Switches, Magnets,
and Electromagnets, subclass 209 for magnets, per se.
Subclass:
63
INTERCONNECTION ARRANGEMENTS:
This subclass is indented under the class definition.
Subject matter having physical paths by which information is
transferred to, from, or between storage elements.
SEE OR SEARCH THIS CLASS, SUBCLASS:
189.01 for reading or writing information from or into a
static memory device.
Subclass:
64
Optical:
This subclass is indented under subclass 63. Subject matter
in which optical elements or paths are used to contact
storage elements.
SEE OR SEARCH THIS CLASS, SUBCLASS:
215 for reading and writing a memory location with an
optical beam.
234 for locating a memory location with an optical beam.
SEE OR SEARCH CLASS:
250, Radiant Energy, subclass 227 for prephotocell system
which includes light conducting rods, subclass 551 for
optical/electrical signal isolators, subclass 553 for
solid-state light source with an array or matrix of
photocells.
359, Optics: Systems (Including Communication) and Elements,
1 for storage systems where there is a holos:graphic storage
medium storing information signals absent any electrical
circuitry.
385, Optical Waveguides, appropriate subclasses for light
transmitting fibers, rods, or pipes.
Subclass:
65
Ferroelectric:
This subclass is indented under subclass 63. Subject matter
where the interconnected storage elements are ferroelectric
devices.
SEE OR SEARCH THIS CLASS, SUBCLASS:
109 and 117, for ferroelectric memories involving radiant
energy.
145 for other ferroelectric memories.
SEE OR SEARCH CLASS:
349, Liquid Crystal Cells, Elements and Systems, subclass 37,
49, and 172+ for light control in ferroelectric liquid
crystal devices.
359, Optics: Systems (Including Communication) and Elements,
245 for light control with ferroelectric devices and
subclass 484 for polarization using ferroelectric devices.
Subclass:
66
Magnetic:
This subclass is indented under subclass 63. Subject matter
where the storage elements are magnetic devices.
Subclass:
67
Plural diagonal:
This subclass is indented under subclass 66. Subject matter
in which single or plural windings are threaded or coupled to
the magnetic elements at an angle of approximately 45 to the
row or columns. For example: [figure]
Subclass:
68
Tree:
This subclass is indented under subclass 66. Subject matter
where the interconnections of the cells are shaped as a
divergent branching arrangement with each preceding cell
output connected to a plurality of succeeding cells or vice
versa. For example: [figure]
Subclass:
69
Crossover:
This subclass is indented under subclass 66. Subject matter
where a row (column) of cells are interconnected to an
adjacent row (column) by mutually crossing over prior to the
end of the row (column). For example: [figure]
Subclass:
70
Woven:
This subclass is indented under subclass 66. Subject matter
where the magnetic storage cells are interconnected by
windings which are woven as a weft and warp. For example:
[figure]
Subclass:
71
Negative resistance:
This subclass is indented under subclass 63. Subject matter
where the interconnected storage elements exhibit negative
resistance.
SEE OR SEARCH THIS CLASS, SUBCLASS:
159 for negative resistance storage elements.
SEE OR SEARCH CLASS:
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, 568 for miscellaneous circuits
utilizing a negative resistance device.
Subclass:
72
Transistors or diodes:
This subclass is indented under subclass 63. Subject matter
where the interconnected storage elements are transistors or
diodes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
104 105 and 174+, for particular transistor or diode storage
elements.
SEE OR SEARCH CLASS:
257, Active Solid-State Devices (e.g., Transistors,
Solid-State Diodes), appropriate subclasses for transistors
and diodes, per se.
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, appropriate subclasses for
miscellaneous circuits using transistors or diodes.
Subclass:
73
RECIRCULATION STORES:
This subclass is indented under the class definition.
Subject matter in which the output of a storage element is
connected back to its input, i.e., to form a storage loop.
(1) Note. This subclass does not accept shift registers,
per se.
SEE OR SEARCH THIS CLASS, SUBCLASS:
78 for stepwise movement which does not loop the output of a
storage element back to its input.
80 for magnetic shift registers which do not have a feedback
means.
SEE OR SEARCH CLASS:
370, Multiplex Communications, appropriate subclasses for
multiplex switching techniques similar to addressing or the
handling of memory information signals.
377, Electrical Pulse Counters, Pulse Dividers, or Shift
Registers: Circuits and Systems, subclass 122, 124 and 126
for ring counters and subclass 129 for pulse counters where
the pulse are continuously circulated in a closed loop.
Subclass:
74
Magnetic:
This subclass is indented under subclass 73. Subject matter
where the recirculation storage device uses magnetic storage
elements.
SEE OR SEARCH THIS CLASS, SUBCLASS:
80 for magnetic shift registers.
Subclass:
75
Stepwise:
This subclass is indented under subclass 73. Subject matter
wherein the information is moved through the memory in a
stepwise manner.
Subclass:
76
Delay lines:
This subclass is indented under subclass 73. Subject matter
wherein the information is moved through a delay line.
SEE OR SEARCH THIS CLASS, SUBCLASS:
93 for magnetic shift registers which include a delay
means.
194 for read/write circuits which include a delay signal.
SEE OR SEARCH CLASS:
333, Wave Transmission Lines and Networks, 138 for delay
lines, per se.
Subclass:
77
Plural paths:
This subclass is indented under subclass 73. Subject matter
wherein the information is recirculated through plural
paths.
SEE OR SEARCH CLASS:
370, Multiplex Communications, 351 for pathfinding or
routing in multiplex communications which may include a
static memory device.
Subclass:
78
PLURAL SHIFT REGISTER MEMORY DEVICES:
This subclass is indented under the class definition.
Subject matter in which information flows through two or more
shift registers which are used in a static memory system.
SEE OR SEARCH CLASS:
711, Electrical Computers and Digital Processing Systems:
Memory, 109 for more than nominal recitation of a shift
register in combination with accessing and control in a
digital data processing environment and subclasses 117+ for
hierarchical memory accessing and control.
Subclass:
80
MAGNETIC SHIFT REGISTERS:
This subclass is indented under the class definition.
Subject matter where information is transferred (shifted)
from one magnetic element to another along an array.
SEE OR SEARCH CLASS:
377, Electrical Pulse Counters, Pulse Dividers, or Shift
Registers: Circuits and Systems, subclass 57 and 64.
Subclass:
81
Bidirectional:
This subclass is indented under subclass 80. Subject matter
in which information can be shifted forward or backward.
Subclass:
82
Two cells per bit:
This subclass is indented under subclass 80. Subject matter
in which two magnetic elements are required to store a single
bit of information.
SEE OR SEARCH THIS CLASS, SUBCLASS:
131 for nonshifting systems which require two elements to
store a single bit of information.
Subclass:
83
SiPo/PiSo:
This subclass is indented under subclass 80. Subject matter
where the magnetic shift register has a serial input with
parallel out or vice versa.
SEE OR SEARCH THIS CLASS, SUBCLASS:
219 for read/write circuits which have serial input with
parallel out or vice versa.
Subclass:
84
Core in transfer loop:
This subclass is indented under subclass 80. Subject matter
where a magnetic core is located in the transfer loop between
the storage elements of the shift register.
Subclass:
85
Continuous:
This subclass is indented under subclass 80. Subject matter
having a magnetic shift register where the magnetic element
is composed of a continuous material with a plurality of
storage positions along its length.
SEE OR SEARCH THIS CLASS, SUBCLASS:
134 for nonshifting systems which use continuous type
storage elements.
Subclass:
86
Plated wire:
This subclass is indented under subclass 85. Subject matter
having a continuous magnetic element which is a nonmagnetic
wire, ribbon, or tube that is coated with a thin magnetic
film.
Subclass:
87
Thin film:
This subclass is indented under subclass 80. Subject matter
having a magnetic shift register where the device is a thin
film cell which has a thickness of approximately 1 to 12,000
angstroms.
SEE OR SEARCH THIS CLASS, SUBCLASS:
86 for magnetic shift register where the element is composed
of a continuous thin film material.
171 for a nonshifting system where the element is a thin
film material.
Subclass:
88
Domain tip:
This subclass is indented under subclass 87. Subject matter
where the magnetic element has a domain in the shape of a
tear, "lenicular".
Subclass:
89
Logic:
This subclass is indented under subclass 80. Subject matter
where a magnetic shift register is used as a logic device.
(1) Note. This subclass is limited to logic circuits
wherein the magnetic element is used as a storage device.
SEE OR SEARCH CLASS:
307, Electrical Transmission or Interconnection Systems,
subclass 406, 407, and 408 for logic circuits which are
saturable reactor devices.
326, Electronic Digital Logic Circuitry, appropriate
subclasses for electronic digital logic circuits.
708, Electrical Computers: Arithmetic Processing and
Calculating, 100 for logic devices which perform
mathematical computations.
Subclass:
90
Multiaperture cell:
This subclass is indented under subclass 80. Subject matter
having magnetic shift registers where the cell contains two
or more apertures for storing information.
SEE OR SEARCH THIS CLASS, SUBCLASS:
140 for a multiaperture cell used in a nonshifting magnetic
system.
SEE OR SEARCH CLASS:
307, Electrical Transmission or Interconnection Systems,
subclass 408 and 422 for multiaperture cells in nonlinear
reactor systems.
Subclass:
91
Ladder:
This subclass is indented under subclass 90. Subject matter
wherein the cell has an array of apertures in the shape of
squares or rectangles.
Subclass:
92
With other type core:
This subclass is indented under subclass 90. Subject matter
where the magnetic shift register includes multiaperture
cells plus other types of storage cells.
SEE OR SEARCH CLASS:
711, Electrical Computers and Digital Processing Systems:
Memory, 1 for addressing combined with specific memory
configurations (e.g., extended, expanded, dynamic, etc.) and
subclasses 101+ for storage accessing and control of specific
memory compositions in a digital data processing system.
Subclass:
93
Including delay means:
This subclass is indented under subclass 80. Subject matter
where a magnetic shift register includes a delay network or
delay means.
(1) Note. The mere delay of a signal is not appropriate
subject matter for this subclass since all shift registers
inherently delay a signal.
SEE OR SEARCH THIS CLASS, SUBCLASS:
76 for recirculation storage device which includes delay
lines.
194 for read/write circuits which use a delay signal.
SEE OR SEARCH CLASS:
326, Electronic Digital Logic Circuitry, 93 for clocking or
synchronizing of logic gates or stages.
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, particularly 261 and 392+ for
miscellaneous circuits utilizing delay.
333, Wave Transmission Lines and Networks, 138 for passive
delay networks.
Subclass:
94
READ ONLY SYSTEMS (I.E., SEMI-PERMANENT):
This subclass is indented under the class definition.
Subject matter in which information stored is not usually
erased, e.g., destructively stored, as for repetitive
readout.
(1) Note. Read only systems are normally read by an
addressing means where coded record sensors are usually
scanned spatially.
SEE OR SEARCH THIS CLASS, SUBCLASS:
120 for information masking.
SEE OR SEARCH CLASS:
235, Registers, 435 for coded record sensors.
337, Electricity: Electrothermally or Thermally Actuated
Switches, appropriate subclass for a switch, per se.
340, Communications: Electrical, 825.79 for selective
matrix.
Subclass:
95
With override (i.e., latent image):
This subclass is indented under subclass 94. Subject matter
wherein the original information may be temporarily
overridden, i.e., memory may be operated as read/write with
read only information recoverable.
Subclass:
96
Fusible:
This subclass is indented under subclass 94. Subject matter
wherein the storage element is a fusible link.
SEE OR SEARCH CLASS:
257, Active Solid-State Devices (e.g., Transistors,
Solid-State Diodes), subclass 50, 530 and 928 for shorted,
(e.g., anti-fuse, element's).
Subclass:
97
Magnetic:
This subclass is indented under subclass 94. Subject matter
where the rod only memory uses magnetic storage elements.
Subclass:
98
Random core:
This subclass is indented under subclass 97. Subject matter
in which the storage system is composed of a magnetic matrix
where some of the intersections have storage elements and
other interconnections do not.
Subclass:
99
Random writing:
This subclass is indented under subclass 97. Subject matter
in which the storage system is composed of a magnetic matrix
with storage elements at its intersections of which only some
are wired.
Subclass:
100
Resistive:
This subclass is indented under subclass 94. Subject matter
wherein the storage element is resistive.
SEE OR SEARCH THIS CLASS, SUBCLASS:
148 for other resistive storage elements.
Subclass:
101
Inductive:
This subclass is indented under subclass 94. Subject matter
wherein the storage element in inductive.
SEE OR SEARCH THIS CLASS, SUBCLASS:
129 for other inductive storage elements.
SEE OR SEARCH CLASS:
336, Inductor Devices, for inductors, per se.
Subclass:
102
Capacitative:
This subclass is indented under subclass 94. Subject matter
wherein the storage element is capacitative.
SEE OR SEARCH THIS CLASS, SUBCLASS:
149 for other capacitative storage elements.
Subclass:
103
Semiconductive:
This subclass is indented under subclass 94. Subject matter
wherein the storage element is a semiconductor.
SEE OR SEARCH THIS CLASS, SUBCLASS:
174 for other semiconductor storage elements.
SEE OR SEARCH CLASS:
438, Semiconductor Device Manufacturing: Process, for
methods of making semiconductor memory devices.
Subclass:
104
Transistors:
This subclass is indented under subclass 103. Subject matter
wherein the semiconductor storage element includes one or
more transistors.
Subclass:
105
Diodes:
This subclass is indented under subclass 103. Subject matter
wherein the semiconductor storage element includes one or
more diodes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
115 for radiant energy memory systems which use diodes.
175 for other diode storage elements.
Subclass:
106
RADIANT ENERGY:
This subclass is indented under the class definition.
Subject matter wherein the condition or state of a memory
material or element is altered in accordance with the
information stored.
(1) Note. The material is altered by a radiation beam
and/or changes its own state of generating radiation.
Information is usually read out electrically, e.g., a
semiconductive material is irradiated to cause it to
conduct.
SEE OR SEARCH THIS CLASS, SUBCLASS:
64 for optical interconnection arrangements.
120 for radiant energy storage using informational masking.
215 and 234, for optical read/write circuits and addressing
circuits, respectively.
237 for electron beam addressing.
SEE OR SEARCH CLASS:
250, Radiant Energy, for radiant energy devices, per se.
257, Active Solid-State Devices (e.g., Transistors,
Solid-State Diodes), subclass 10, 11, 21, 53-56, 113-118,
184-189, 225-234, 257, 258, 290-294, and 414-470 for
radiation-sensitive active semiconductor devices.
313, Electric Lamp and Discharge Devices, for lamp and
discharge devices, per se.
315, Electric Lamp and Discharge Devices: Systems, for lamp
and discharge systems.
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, 514 for miscellaneous circuits
effected by light.
346, Recorders, 107.1 for optical recorders for recording
phenomenal information.
347, Incremental Printing of Symbolic Information, 224 for
radiation marking, particularly subclass 264 for record
receiver or handling means therefor, subclasses 225+ for
scanning apparatus or method for marking information,
particularly subclass 262 for record receiver or handling
means therefor, and subclasses 129+ for electrostatic
recorders including photoscanning device.
358, Facsimile and Static Presentation Processing, subclass
296 for facsimile recording.
359, Optics: Systems (Including Communication) and Elements,
for optical devices, per se, and systems.
369, Dynamic Information Storage or Retrieval, 100 for
optical sound recorders.
386, Television Signal Processing for Dynamic Recording or
Reproducing, 42 and 128+ for recording or reproducing of
television signal using light or beam, subclass 126 for
television recording having optical disc, and subclass 127
for dynamic thermoplastic recording of television signal.
Subclass:
107
Chemical fluids:
This subclass is indented under subclass 106. Subject matter
wherein the memory material is a chemical fluid.
SEE OR SEARCH THIS CLASS, SUBCLASS:
45 for analog chemical fluid storage devices.
153 for electrochemical storage elements not using radiant
energy.
SEE OR SEARCH CLASS:
205, Electrolysis: Processes, Compositions Used Therein, and
Methods of Preparing the Compositions, subclass 68 for
recording devices.
252, Compositions, subclass 62.2 for chemical fluids, per
se, used in electrical devices.
324, Electricity: Measuring and Testing, subclass 94 for
measuring electricity with a chemical fluid.
430, Radiation Imagery Chemistry: Process, Composition, or
Product Thereof, appropriate subclasses for radiation
sensitive compositions and elements.
Subclass:
108
Liquid crystal:
This subclass is indented under subclass 106. Subject matter
wherein the memory material is a liquid crystal, i.e.,
pneumatic liquid crystal.
SEE OR SEARCH CLASS:
345, Computer Graphics Processing, Operator Interface
Processing, and Selective Visual Display Systems, subclass
38, 50+, and 87+ for liquid crystal display devices with
selective electrical control means for providing a human
sensible image or message to be displayed.
349, Liquid Crystal Cells, Elements and Systems, appropriate
subclasses for light control with liquid crystal materials.
Subclass:
109
Photoconductive and ferroelectric:
This subclass is indented under subclass 106. Subject matter
wherein the memory element has both photoconductive and
ferroelectric properties and/or materials.
SEE OR SEARCH THIS CLASS, SUBCLASS:
112 for photoconductive memory elements.
117 for ferroelectric memory elements using radiant energy.
145 for ferroelectric memory elements not using radiant
energy.
Subclass:
110
Electroluminescent and photoconductive:
This subclass is indented under subclass 106. Subject matter
wherein the memory element has both solid-state
electroluminescent and photoconductive properties and/or
materials.
SEE OR SEARCH THIS CLASS, SUBCLASS:
111 for electroluminescent memory elements.
112 for photoconductive memory elements.
Subclass:
111
Electroluminescent:
This subclass is indented under subclass 106. Subject matter
wherein the storage material is a solid-state
electroluminescent material.
SEE OR SEARCH THIS CLASS, SUBCLASS:
120 for information masking storage where the
electroluminescent element is used as a radiation source and
not to store information.
SEE OR SEARCH CLASS:
250, Radiant Energy, 458.1 for luminophor irradiation,
subclasses 483.1+ for luminescent devices.
340, Communications: Electrical, 825.79 for
electroluminescent switching matrices.
345, Computer Graphics Processing, Operator Interface
Processing, and Selective Visual Display Systems, subclass
36, 45, and 76+ for electroluminescent display devices
combined with selective electrical control means for
producing a human sensible image or message.
399, Electrophotography, subclass 158 for image reproduction
and display therefore.
Subclass:
112
Photoconductive:
This subclass is indented under subclass 106. Subject matter
wherein the storage material is a photoconductive material.
SEE OR SEARCH CLASS:
250, Radiant Energy, 200 for photosensitive cells and
circuits.
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, 514 for miscellaneous light sensitive
circuits.
Subclass:
113
Amorphous:
This subclass is indented under subclass 106. Subject matter
wherein the storage material can be changed from a
crystalline (ordered) structure to an amorphous (disordered)
structure by means of radiant energy.
SEE OR SEARCH THIS CLASS, SUBCLASS:
163 for amorphous storage elements using electrical
properties.
SEE OR SEARCH CLASS:
257, Active Solid-State Devices (e.g., Transistors,
Solid-State Diodes), appropriate subclasses, especially
subclasses 2-5, 16, 52 through 63, 646, and 650 for amorphous
material devices.
Subclass:
114
Semiconductive:
This subclass is indented under subclass 106. Subject matter
wherein the storage material is a semiconductor.
SEE OR SEARCH THIS CLASS, SUBCLASS:
174 for semiconductive storage elements not involving
radiant energy.
Subclass:
115
Diodes:
This subclass is indented under subclass 114. Subject matter
wherein the semiconductive storage device includes one or
more diodes.
SEE OR SEARCH CLASS:
250, Radiant Energy, subclass 533 for photocells with
solid-state light-emitting diodes in the configuration of an
array or matrix.
Subclass:
116
Plasma:
This subclass is indented under subclass 106. Subject matter
wherein the storage element is a gaseous discharge device.
SEE OR SEARCH CLASS:
313, Electric Lamp and Discharge Devices, for appropriate
discharge device, per se.
315, Electric Lamp and Discharge Devices: Systems, subclass
169.4 for gas display panel device with energizing means.
345, Computer Graphics Processing, Operator Interface
Processing, and Selective Visual Display Systems, subclass
37, 41+, and 60+ for gaseous discharge display devices
combined with selective electrical control means for
providing a human sensible image or message to be displayed.
Subclass:
117
Ferroelectric:
This subclass is indented under subclass 106. Subject matter
wherein the storage element is a ferroelectric material.
SEE OR SEARCH THIS CLASS, SUBCLASS:
109 for ferroelectric plus photoconductive radiant energy
storage elements.
121 for storage of information using informational masking
with polarization wherein the polarizer may be a
ferroelectric device.
145 for ferroelectric memory elements not involving
radiation.
SEE OR SEARCH CLASS:
359, Optics: Systems (Including Communication) and Elements,
245 for light control with ferroelectric devices and
subclasses 484 for polarization using ferroelectric devices.
Subclass:
118
Electron beam:
This subclass is indented under subclass 106. Subject matter
wherein the memory material has its state changed by radiant
energy which is an electron beam.
(1) Note. This subclass will accept cathode-ray tube (CRT)
storage with random access means.
SEE OR SEARCH THIS CLASS, SUBCLASS:
128 for memories using electron beams for information
masking, e.g., CRT with masking means.
217 for read/write circuits for an electron beam storage
system.
237 for addressing a memory with an electron beam.
SEE OR SEARCH CLASS:
250, Radiant Energy, appropriate subclass for electron beam
devices, particularly 492.1 for irradiating of objects or
materials.
313, Electric Lamp and Discharge Devices, subclass 391 for
CRT storage device, per se.
315, Electric Lamp and Discharge Devices: Systems, 8.5 for
electron beam storage systems and subclasses 84.5+ for
gaseous discharge tube storage systems.
377, Electrical Pulse Counters, Pulse Dividers, or Shift
Registers: Circuits and Systems, subclass 99 for counters
using beam type tubes.
386, Television Signal Processing for Dynamic Recording or
Reproducing, appropriate subclass for video signal which
includes electron beam devices.
Subclass:
119
Color centers:
This subclass is indented under subclass 106. Subject matter
wherein the memory material is a crystal containing local
imperfections, which will absorb (or generate) light of a
particular frequency (color) depending on the energy level of
the electron at the imperfection.
SEE OR SEARCH CLASS:
349, Liquid Crystal Cells, Elements and Systems, subclasses
69-71 for color liquid crystal material used in light
control.
430, Radiation Imagery Chemistry: Process, Composition, or
Product Thereof, 541 for radiation sensitive color changing
composition.
Subclass:
120
INFORMATION MASKING:
This subclass is indented under the class definition.
Subject matter wherein a radiant beam is altered as a
function of the information stored, e.g., light beam used to
read information stored as transparent and opaque areas in a
memory element.
SEE OR SEARCH THIS CLASS, SUBCLASS:
106 for memories using radiant energy without information
masking.
SEE OR SEARCH CLASS:
235, Registers, 454 for sensing records with light beams.
346, Recorders, 107.1 for optical recorders for recording
phenomenal information, subclass 74.1 for magnetic visible
image recording.
347, Incremental Printing of Symbolic Information, 224 for
radiation marking, particularly subclass 264 for record
receiver or handling means therefor, subclasses 225+ for
scanning apparatus or method for marking information,
particularly subclass 262 for record receiver or handling
means therefor, and subclasses 129+ for electrostatic
recorders including photoscanning device.
358, Facsimile and Static Presentation Processing, 296 for
facsimile recording.
369, Dynamic Information Storage or Retrieval, 100 for
optical sound recorders.
386, Television Signal Processing for Dynamic Recording or
Reproducing, subclass 30, 38, 108, 117+, 128+ for
photos:graphic television recording, subclass 126 for
television recording having optical disc, and subclass 127
for dynamic thermoplastic recording or television signal.
Subclass:
121
Polarization:
This subclass is indented under subclass 120. Subject matter
wherein the polarization of the radiation beam is altered as
a function of the information stored.
SEE OR SEARCH THIS CLASS, SUBCLASS:
117 for polarization with ferroelectric memory materials.
SEE OR SEARCH CLASS:
359, Optics: Systems (Including Communication) and Elements,
240 and 484 for changing the properties of polarized light
by an applied field.
Subclass:
122
Magneto-optical:
This subclass is indented under subclass 121. Subject matter
wherein the polarization is altered by a memory material
which has magneto-optic properties.
SEE OR SEARCH CLASS:
360, Dynamic Magnetic Information Storage or Retrieval,
subclass 114 for magneto-optic recording heads.
Subclass:
123
Bragg cells:
This subclass is indented under subclass 120. Subject matter
wherein a Bragg cell is used to diffract a light beam into
plural light beams.
Subclass:
124
Diffraction:
This subclass is indented under subclass 120. Subject matter
wherein the radiation beam is diffracted as a function of the
information stored.
SEE OR SEARCH CLASS:
356, Optics: Measuring and Testing, subclass 450 for
measuring systems using diffracted light.
359, Optics: Systems (Including Communication) and Elements,
566 for diffraction gratings.
Subclass:
125
Holograms:
This subclass is indented under subclass 124. Subject matter
wherein object and reference beams are required to store
information.
SEE OR SEARCH THIS CLASS, SUBCLASS:
216 for circuits used to read/write holos:graphic memories.
SEE OR SEARCH CLASS:
235, Registers, subclass 457 for holos:graphic card
readers.
359, Optics: Systems (Including Communication) and Elements,
1 for storage systems where there is a holos:graphic storage
medium storing information signal absent any electrical
circuitry.
Subclass:
126
Thermoplastic:
This subclass is indented under subclass 120. Subject matter
wherein the radiation beam is altered by different
thicknesses of a thermoplastic memory material.
SEE OR SEARCH CLASS:
347, Incremental Printing of Symbolic Information, subclass
113 for electrostatic marking apparatus and processes in
which a latent image is made visible by applying heat to
cause plastic deformation of a charged medium.
386, Television Signal Processing for Dynamic Recording or
Reproducing, subclass 127 for dynamic thermoplastic
recording of television signal.
Subclass:
127
Transparency:
This subclass is indented under subclass 120. Subject matter
wherein the radiation beam is altered by the transparent and
opaque areas of the memory material.
SEE OR SEARCH THIS CLASS, SUBCLASS:
113 for amorphous memories exhibiting transparency
properties.
SEE OR SEARCH CLASS:
235, Registers, 454 for optical card readers.
386, Television Signal Processing for Dynamic Recording or
Reproducing, subclass 30, 38, 42+, 108, 117+, and 128+ for
photos:graphic television recording, and subclass 126 for
television recording having optical disc.
Subclass:
128
Electron beams:
This subclass is indented under subclass 120. Subject matter
wherein the radiation beam being altered is an electron
beam.
SEE OR SEARCH THIS CLASS, SUBCLASS:
118 for other electron beam memories.
237 for circuits to direct an electron beam to a memory
location.
SEE OR SEARCH CLASS:
250, Radiant Energy, appropriate subclass for electron beam
devices.
313, Electric Lamp and Discharge Devices, 391 for
cathode-ray tube (CRT) storage device, per se.
315, Electric Lamp and Discharge Devices: Systems, 8.5 for
electron beam storage systems and subclasses 84.5+ for
gaseous discharge tube storage systems.
377, Electrical Pulse Counters, Pulse Dividers, or Shift
Registers: Circuits and Systems, subclass 99 for counters
using beam type tubes.
Subclass:
129
SYSTEMS USING PARTICULAR ELEMENTS:
This subclass is indented under the class definition.
Subject matter where the type of storage element used is
significant.
SEE OR SEARCH THIS CLASS, SUBCLASS:
94 for storage elements used as read only memories.
106 for storage elements involving radiant energy.
120 for storage elements involving informational masking.
SEE OR SEARCH CLASS:
257, Active Solid-State Devices (e.g., Transistors,
Solid-State Diodes), appropriate subclasses for particular
active solid-state devices which may be found in a static
memory device, including subclass 225, 260, 390, 391, 903,
904, and 910 for solid-state static memory or memory element
structure.
313, Electric Lamp and Discharge Devices, for appropriate
lamp and discharge devices, per se.
315, Electric Lamp and Discharge Devices: Systems, for
particular circuits using appropriate lamp and discharge
devices.
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, appropriate subclasses and
particularly 199 for bistable devices which may be used in
memory cells or arrays.
359, Optics: Systems (Including Communication) and Elements,
for particular optical elements.
Subclass:
130
Three-dimensional magnetic array:
This subclass is indented under subclass 129. Subject matter
where the magnetic storage elements are arrayed in three
dimensions.
Subclass:
131
Two magnetic cells per bit:
This subclass is indented under subclass 129. Subject matter
where two magnetic elements are used to store a single bit of
information.
SEE OR SEARCH THIS CLASS, SUBCLASS:
82 for two cells per bit magnetic shift registers.
Subclass:
132
Different size cores:
This subclass is indented under subclass 129. Subject matter
where at least two of the magnetic elements in the system
have different dimensions or a different number of winding
turns.
Subclass:
133
Cells of diverse coercivity:
This subclass is indented under subclass 129. Subject matter
in which the material of different magnetic elements or the
same magnetic element exhibits diverse magnetic properties.
Subclass:
134
Continuous cell:
This subclass is indented under subclass 129. Subject matter
where the magnetic element is composed of a continuous
material with a plurality of storage positions along its
length.
SEE OR SEARCH THIS CLASS, SUBCLASS:
85 for magnetic shift registers which use continuous cells
as its storage elements.
Subclass:
135
Elongated or bar-shaped cell:
This subclass is indented under subclass 134. Subject matter
where the cross section of the magnetic storage element is
small compared to its length.
SEE OR SEARCH THIS CLASS, SUBCLASS:
86 for magnetic shift registers which use plated wire as the
storage element.
Subclass:
136
Twisters:
This subclass is indented under subclass 135. Subject matter
where the magnetic storage element has an easy axis in the
helical direction (approximately 45) or is a wire and is
formed in the shape of a helix.
Subclass:
137
Tubular:
This subclass is indented under subclass 135. Subject matter
where the magnetic storage element is in the shape of a
hollow tube.
Subclass:
138
Chain:
This subclass is indented under subclass 135. Subject matter
where the magnetic storage device is an elongated element
with circular aperture storage positions along its length.
SEE OR SEARCH THIS CLASS, SUBCLASS:
91 for magnetic shift registers wherein the storage device
is an elongated element with square or rectangular storage
apertures.
Subclass:
139
Plated wire:
This subclass is indented under subclass 135. Subject matter
having a continuous element which is a nonmagnetic wire or
ribbon that is coated with a thin magnetic film.
(1) Note. A wire is considered to be an elongated material
of indeterminate length.
SEE OR SEARCH THIS CLASS, SUBCLASS:
86 for magnetic shift registers which use continuous plated
wire as its storage elements.
171 for magnetic thin film storage elements which are not of
the continuous type.
Subclass:
140
Multiaperture cell:
This subclass is indented under subclass 129. Subject matter
having a magnetic cell which contains two or more apertures
for storing information.
SEE OR SEARCH THIS CLASS, SUBCLASS:
90 for magnetic shift registers which use multiaperture
storage cells.
SEE OR SEARCH CLASS:
307, Electrical Transmission or Interconnection Systems,
subclass 408 and 422 for multiaperture cells in nonlinear
reactor systems.
Subclass:
141
Apertured plate:
This subclass is indented under subclass 140. Subject matter
where a plurality of apertures in a magnetic plate are in a
common plane which formulates rows and columns.
SEE OR SEARCH THIS CLASS, SUBCLASS:
90 for magnetic shift registers which use multiaperture
storage cells.
Subclass:
142
Aperture with transverse axis:
This subclass is indented under subclass 140. Subject matter
where the axes of the apertures of the multiaperture element
are not parallel.
Subclass:
143
Biax:
This subclass is indented under subclass 142. Subject matter
where the axes of the aperture are perpendicular.
Subclass:
144
Same size apertures:
This subclass is indented under subclass 140. Subject matter
where all of the apertures of the multiaperture element are
the same size.
Subclass:
145
Ferroelectric:
This subclass is indented under subclass 129. Subject matter
where the storage element is ferroelectric.
SEE OR SEARCH THIS CLASS, SUBCLASS:
65 for interconnection arrangements which use ferroelectric
storage elements.
109 and 117, for ferroelectrics involving radiant energy.
157 for piezoelectric storage devices.
SEE OR SEARCH CLASS:
252, Compositions, subclass 62.9 for a composition designed
for use as piezoelectric material.
310, Electrical Generator or Motor Structure, 311 for
piezoelectric devices.
349, Liquid Crystal Cells, Elements and Systems, subclass 37,
49, and 172+ for light control in ferroelectric liquid
crystal devices.
359, Optics: Systems (Including Communication) and Elements,
245 for light control with ferroelectric devices and
subclass 484 for polarization using ferroelectric devices.
361, Electricity: Electrical Systems and Devices, 321.1 for
ferroelectric capacitors, per se.
Subclass:
146
Electrets:
This subclass is indented under subclass 129. Subject matter
in which the storage medium is an electret, that is, an
element which exhibits a permanent external electrostatic
field due to internal polarization.
SEE OR SEARCH THIS CLASS, SUBCLASS:
145 for ferroelectric storage systems.
147 for persistent internal polarization devices.
SEE OR SEARCH CLASS:
307, Electrical Transmission or Interconnection Systems,
subclass 400 for electrets used in saturable reactor
systems.
Subclass:
147
Persistent internal polarization (PIP):
This subclass is indented under subclass 129. Subject matter
in which storage is effected and information is represented
by the persistent internal polarization by an established
electric field in a photoconductive dielectric medium, i.e.,
photoelectret.
SEE OR SEARCH CLASS:
355, Photocopying, 3 for electric photography.
430, Radiation Imagery Chemistry: Process, Composition, or
Product Thereof, 31 for elements of electrical photography
and radiation sensitive conductive compositions.
Subclass:
148
Resistive:
This subclass is indented under subclass 129. Subject matter
in which the storage element is an electrically resistive
member.
SEE OR SEARCH THIS CLASS, SUBCLASS:
100 for semipermanent resistor memories.
112 for optically controlled resistive devices, i.e.,
photoconductors.
160 for magnetically controlled resistive devices, i.e.,
superconductors.
SEE OR SEARCH CLASS:
250, Radiant Energy, 200 for photocell devices.
338, Electrical Resistors, 13 for resistance value
responsive to a condition, subclass 32 for superconductors.
Subclass:
149
Capacitors:
This subclass is indented under subclass 129. Subject matter
in which the storage element is a capacitative device.
SEE OR SEARCH THIS CLASS, SUBCLASS:
102 for semipermanent capacitor memories.
SEE OR SEARCH CLASS:
307, Electrical Transmission or Interconnection Systems,
subclass 108 for pulse generators using a capacitor and
subclasses 109 and 110 for other capacitor circuits storing
energy.
320, Electricity: Battery or Capacitor Charging or
Discharging, 166 for capacitor charging or discharging, per
se.
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, appropriate subclasses for
miscellaneous circuits utilizing a capacitive storage
element.
361, Electricity: Electrical Systems and Devices, 271 for
capacitors, per se, subclasses 500+ for electrolytic
capacitors, systems and devices.
Subclass:
150
Inherent:
This subclass is indented under subclass 149. Subject matter
wherein the capacitor is the inherent capacitance of a
circuit element.
Subclass:
151
Molecular or atomic:
This subclass is indented under subclass 129. Subject matter
in which information is stored at a molecular, atomic, a
subatomic level, or arrangement.
SEE OR SEARCH THIS CLASS, SUBCLASS:
119 for color centers (photochromatic material).
Subclass:
152
Nuclear induction or spin echo:
This subclass is indented under subclass 151. Subject matter
which exploits nuclear induction spin echo capability for
information storage and retrieval.
Subclass:
153
Electrochemical:
This subclass is indented under subclass 129. Subject matter
where an electrochemical material is used for the storage and
retrieval of information.
SEE OR SEARCH THIS CLASS, SUBCLASS:
45 for analog electrochemical storage devices.
SEE OR SEARCH CLASS:
29, Metal Working, subclass 25.03 for the manufacture of
electrolytic type devices.
136, Batteries: Thermoelectric and Photoelectric,
appropriate subclasses for producing electricity by
electrochemical action.
204, Chemistry: Electrical and Wave Energy, appropriate
subclasses for electrolytic devices utilized to produce
chemical change, as for example, electroplating cells, and
for analytical and control electrolytic devices, such as pH
cells.
252, Compositions, subclass 62.2 for electrolytes for
electrical devices, and subclass 62.3 for barrier layer
device compositions.
314, Electric Lamp and Discharge Devices, Consumable
Electrodes, subclass 132 for arc lamps having electrolytic
resistances.
320, Electricity: Battery or Capacitor Charging or
Discharging, appropriate subclass for charging or discharging
an electrolytic capacitor or an electrolytic cell.
322, Electricity: Single Generator Systems, subclass 79 for
the control of the generator circuit by the use of
electrolytic impedances.
324, Electricity: Measuring and Testing, 425 for
electrolytic testing systems, such as pH measuring systems.
329, Demodulators, appropriate subclasses for electrolytic
type demodulators.
338, Electrical Resistors, 80 for mechanically variable
liquid resistors, and subclass 222 for fixed value liquid
resistors.
361, Electricity: Electrical Systems and Devices, 500 for
electrolytic systems and devices.
363, Electric Power Conversion Systems, subclass 140 for
rectifying systems utilizing electrolytic rectifiers.
Subclass:
154
Flip-flop (electrical):
This subclass is indented under subclass 129. Subject matter
in which the storage element is an electrical bistable
multivibrator.
SEE OR SEARCH THIS CLASS, SUBCLASS:
72 for flip-flop systems having significant interconnection
arrangements.
190 for read/write circuit which uses a complementary
information storage cell.
204 for flip-flops used for sensing information.
SEE OR SEARCH CLASS:
307, Electrical Transmission or Interconnection Systems,
subclass 406 for magnetic flip-flop devices.
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, 185 for miscellaneous flip-flop
circuits.
Subclass:
155
Plural emitter or collector:
This subclass is indented under subclass 154. Subject matter
in which the flip-flop is made up of solid-state devices
which have plural emitters or plural collectors.
SEE OR SEARCH THIS CLASS, SUBCLASS:
179 for a memory system using plural emitter or collector
device as a semiconductive storage element (nonflip-flop).
SEE OR SEARCH CLASS:
257, Active Solid-State Devices (e.g., Transistors,
Solid-State Diodes), appropriate subclasses for active
solid-state devices having multiple/plural emitters or
collectors, especially subclasses 164-166 and 560-564.
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, subclass 577 and 578 for
miscellaneous transistor circuits having multiple collectors
or emitters.
Subclass:
156
Complementary:
This subclass is indented under subclass 154. Subject matter
employing devices having complementary (pnp and npn)
conductivity components.
SEE OR SEARCH THIS CLASS, SUBCLASS:
181 for a memory system using complementary conductivity
semiconductive device as a storage element (nonflip-flop).
SEE OR SEARCH CLASS:
326, Electronic Digital Logic Circuitry, appropriate
subclasses for logic circuits utilizing complementary FET
devices.
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, subclass 214, 484+, and 576 for
miscellaneous circuits utilizing complementary transistors.
Subclass:
157
Magnetostrictive or piezoelectric:
This subclass is indented under subclass 129. Subject matter
in which the storage element is magnetostrictive or
piezoelectric, that is, the shrinkage or expansion of a
material when placed in a magnetic or electric field,
respectively.
SEE OR SEARCH THIS CLASS, SUBCLASS:
76 for recirculation stores using magnetostrictive or
piezoelectric delay lines.
SEE OR SEARCH CLASS:
310, Electrical Generator or Motor Structure, 311 for
piezoelectric devices.
333, Wave Transmission Lines and Networks, 138 for delay
networks which use a magnetostrictive device.
335, Electricity: Magnetically Operated Switches, Magnets,
and Electromagnets, subclass 215 for magnetostrictive type
devices.
Subclass:
158
Magnetoresistive:
This subclass is indented under subclass 129. Subject matter
in which the storage element changes in electrical
conductivity when a magnetic field is applied.
SEE OR SEARCH CLASS:
338, Electrical Resistors, 32 for magnetoresistive devices,
per se.
Subclass:
159
Negative resistance:
This subclass is indented under subclass 129. Subject matter
in which the storage element exhibits negative resistance.
SEE OR SEARCH THIS CLASS, SUBCLASS:
71 for negative resistance interconnection arrangements.
SEE OR SEARCH CLASS:
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, particularly 568 for miscellaneous
negative resistance device circuits.
Subclass:
160
Superconductive:
This subclass is indented under subclass 129. Subject matter
in which the storage element is superconductive in that it
has a finite electrical resistance at particular (usually
normal) temperatures and magnetic field strength and zero
resistance at (usually) cryogenic temperatures and low field
strengths, the change of resistance or presence or absence of
current in the superconductor being used to signify
information.
SEE OR SEARCH CLASS:
326, Electronic Digital Logic Circuitry, 1 for
superconductive logic circuits.
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, 186 and 527+ for miscellaneous
circuits utilizing superconducting elements.
335, Electricity: Magnetically Operated Switches, Magnets,
and Electromagnets, subclass 216 for superconductive type
magnetic devices.
338, Electrical Resistors, 32 for superconductors, per se.
Subclass:
161
Thin film:
This subclass is indented under subclass 160. Subject matter
in which the superconductor is in addition a thin film
device.
Subclass:
162
Josephson:
This subclass is indented under subclass 160. Subject matter
in which information is stored as a function of tunneling in
a Josephson junction.
SEE OR SEARCH CLASS:
257, Active Solid-State Devices (e.g., Transistors,
Solid-State Diodes), subclasses 31-36 for Josephson
devices, per se.
Subclass:
163
Amorphous (electrical):
This subclass is indented under subclass 129. Subject matter
in which information is stored as a function of the
electrical condition of an amorphous material.
SEE OR SEARCH THIS CLASS, SUBCLASS:
113 for amorphous which are effected by radiant energy.
SEE OR SEARCH CLASS:
257, Active Solid-State Devices (e.g., Transistors,
Solid-State Diodes), subclasses 2-5, 16, 49+, especially
52-63, 646 and 650 for amorphous material devices.
Subclass:
164
Electrical contacts:
This subclass is indented under subclass 129. Subject matter
in which information is stored as a function of the condition
(e.g., presence or absence, opened or closed) of electrical
contacts.
SEE OR SEARCH CLASS:
74, Machine Element or Mechanism, subclass 568 for memory
devices using contacts activated by cams.
Subclass:
165
Coherer:
This subclass is indented under subclass 164. Subject matter
where storage device contacts are embedded in a cohere
material which is responsive to a current or pressure by a
physical change (usually from a solid coherent mass to a
powder) which effects a change in the material resistance.
SEE OR SEARCH CLASS:
338, Electrical Resistors, appropriate subclass for coherer
devices, per se.
Subclass:
166
Relay:
This subclass is indented under subclass 164. Subject matter
in which the storage element is one or more relays.
SEE OR SEARCH CLASS:
335, Electricity: Magnetically Operated Switches, Magnets,
and Electromagnets, appropriate subclass for relay devices,
per se.
361, Electricity: Electrical Systems and Devices, 160 for
electric relay circuits.
Subclass:
167
Simulating biological cells:
This subclass is indented under subclass 129. Subject matter
in which information is stored in a device which simulates
the function of a living nerve cell.
SEE OR SEARCH CLASS:
706, Data Processing: Intelligent Processing Systems and
Methods, subclass 44 for simulating operational functions of
living nerve cells.
Subclass:
168
Ternary:
This subclass is indented under subclass 129. Subject matter
which uses storage cells having three stable states.
Subclass:
169
Gunn effect:
This subclass is indented under subclass 129. Subject matter
in which the storage element is an electrical shock wave
responsive or generative device.
SEE OR SEARCH CLASS:
257, Active Solid-State Devices (e.g., Transistors,
Solid-State Diodes), subclasses 6-8 for Gunn effect
oscillators.
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, appropriate subclasses for
miscellaneous circuitry employing Gunn effect devices.
331, Oscillators, subclass 107 for Gunn effect oscillators.
Subclass:
170
Hall effect:
This subclass is indented under subclass 129. Subject matter
in which the storage element or a component of the storage
element exhibits Hall effect characteristics.
SEE OR SEARCH CLASS:
324, Electricity: Measuring and Testing, subclass 45 for
determining the characteristics of a magnetic field utilizing
the Hall effect.
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, subclass 187 for a stable state
circuit with a Hall element and subclass 511 for a
miscellaneous circuit utilizing a Hall element.
329, Demodulators, appropriate subclasses for demodulating
elements whose resistance or reactance changes in response to
an applied magnetic field.
338, Electrical Resistors, subclass 32 for Hall effect
devices.
Subclass:
171
Magnetic thin film:
This subclass is indented under subclass 129. Subject matter
where the storage element is a thin film cell which has a
thickness of approximately 1 to 12,000 angstroms.
SEE OR SEARCH THIS CLASS, SUBCLASS:
87 for magnetic shift registers which use thin film storage
elements.
SEE OR SEARCH CLASS:
307, Electrical Transmission or Interconnection Systems,
subclass 403 for saturable reactor systems which use thin
film components.
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, subclass 567 for a miscellaneous
circuit utilizing a thin film device.
Subclass:
172
Isotropic:
This subclass is indented under subclass 171. Subject matter
in which the thin film device has a plurality of easy axes of
magnetization.
Subclass:
173
Multiple magnetic storage layers:
This subclass is indented under subclass 171. Subject matter
where information is stored in a plurality of magnetic layers
within the thin film device.
(1) Note. Included within this subclass are thin film
devices containing a storage layer and a read out layer.
SEE OR SEARCH THIS CLASS, SUBCLASS:
130 for three-dimensional magnetic storage devices where the
adjacent layers are separate.
Subclass:
174
Semiconductive:
This subclass is indented under subclass 129. Subject matter
in which information is stored and retrieved from a
semiconductive material.
SEE OR SEARCH THIS CLASS, SUBCLASS:
72 for transistor or diode interconnection arrangement.
SEE OR SEARCH CLASS:
257, Active Solid-State Devices (e.g., Transistors,
Solid-State Diodes), appropriate subclasses for active
semiconductive material devices, per se.
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, appropriate subclasses for
miscellaneous nonlinear circuits utilizing semiconducting
devices.
438, Semiconductor Device Manufacturing: Process, for methods
of making semiconductor memory devices; see the search notes
therein.
Subclass:
175
Diodes:
This subclass is indented under subclass 174. Subject matter
in which the semiconductor storage element is a diode.
SEE OR SEARCH THIS CLASS, SUBCLASS:
72 for transistor or diode interconnection arrangements.
105 for read only memory systems which use semiconductive
diodes.
115 for radiant energy memory systems which use
semiconductive diodes.
243 for current steering diodes in an addressing storage
system.
Subclass:
176
Silicon on sapphire (SoS):
This subclass is indented under subclass 174. Subject matter
in which the storage element is silicon on sapphire
material.
Subclass:
177
Bipolar and FET:
This subclass is indented under subclass 174. Subject matter
in which bipolar and field effect transistors are used
together in a storage system.
SEE OR SEARCH CLASS:
257, Active Solid-State Devices (e.g., Transistors,
Solid-State Diodes), subclass 273, 370 and 378 for combined
bipolar and field effect devices.
Subclass:
178
Ion implantation:
This subclass is indented under subclass 174. Subject matter
in which the semiconductive storage member is subjected to
modification by ion implantation.
SEE OR SEARCH CLASS:
438, Semiconductor Device Manufacturing: Process, for methods
of making semiconductor memory devices; see the search notes
therein.
Subclass:
179
Plural emitter or collector:
This subclass is indented under subclass 174. Subject matter
in which the semiconductive storage element is either a
plural emitter or a plural collector device.
SEE OR SEARCH THIS CLASS, SUBCLASS:
155 for flip-flop storage devices which use plural emitter
or collector semiconductive materials.
SEE OR SEARCH CLASS:
257, Active Solid-State Devices (e.g., Transistors,
Solid-State Diodes), appropriate subclasses for active
solid-state devices having multiple/plural emitters or
collectors, especially subclasses 164-166 and 560 through
564.
Subclass:
180
Four layer devices:
This subclass is indented under subclass 174. Subject matter
in which four layer devices are used (e.g., pnpn
transistors).
SEE OR SEARCH CLASS:
257, Active Solid-State Devices (e.g., Transistors,
Solid-State Diodes), subclasses 107-181 for regenerative
type devices.
326, Electronic Digital Logic Circuitry, appropriate
subclasses for electronic logic circuits utilizing four or
more layer devices.
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, appropriate subclasses for
miscellaneous circuits utilizing four or more layer devices.
Subclass:
181
Complementary conductivity:
This subclass is indented under subclass 174. Subject matter
in which the storage elements are of complementary
conductivity (e.g., pnp plus npn).
SEE OR SEARCH THIS CLASS, SUBCLASS:
156 for flip-flop storage devices which use complementary
elements.
SEE OR SEARCH CLASS:
257, Active Solid-State Devices (e.g., Transistors,
Solid-State Diodes), appropriate subclasses, including
regenerative type devices in subclasses 107-181, bipolar
devices in subclasses 565+, and field effect devices in
subclasses 213+.
326, Electronic Digital Logic Circuitry, appropriate
subclasses for logic circuits which utilize complementary
transistors.
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, particularly subclass 576 for
miscellaneous circuits utilizing complementary transistors.
Subclass:
182
Insulated gate devices:
This subclass is indented under subclass 174. Subject matter
in which the storage element is an insulated gate device
(e.g., FET).
SEE OR SEARCH CLASS:
257, Active Solid-State Devices (e.g., Transistors,
Solid-State Diodes), appropriate subclasses, including
subclasses 288-413 for devices with an insulated electrode,
including insulated gate electrode.
326, Electronic Digital Logic Circuitry, appropriate
subclasses for logic circuits utilizing field-effect
transistors.
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, appropriate subclasses for
miscellaneous circuits utilizing field-effect transistors.
Subclass:
183
Charge coupled:
This subclass is indented under subclass 182. Subject matter
in which the storage element is a charge coupled device.
SEE OR SEARCH CLASS:
257, Active Solid-State Devices (e.g., Transistors,
Solid-State Diodes), appropriate subclasses, including 215,
for charge transfer type active semiconductor devices, per
se.
377, Electrical Pulse Counters, Pulse Dividers, or Shift
Registers: Circuits and Systems, subclass 63 for
charge-coupled devices used as pulse counters and shift
registers.
Subclass:
184
Variable threshold:
This subclass is indented under subclass 182. Subject matter
in which the storage device is a FET transistor which has a
variable threshold gate, e.g., MNOS.
Subclass:
185.01
FLOATING GATE:
This subclass is indented under the class definition.
Subject matter wherein a device stores and retrieves
information from a conductive insulated gate that
indefinitely holds an amount of charge having a specific
polarity, and it is electrically insulated and isolated from
other parts of the device.
(1) Note. A floating gate array usually has, at least, a
second control gate that may be connected to the word (row
address) line for the inducement of an operative control
potential during operation.
SEE OR SEARCH CLASS:
257, Active Solid-State Devices (e.g., Transistors,
Solid-State Diodes), subclass 314 for a substructure
floating gate memory device having a variable threshold
(e.g., by storage of charge in an insulator layer adjacent to
a channel).
Subclass:
185.02
Disturbance control:
Subject matter under 185.01 wherein a threshold shifting
effect is minimized from erasing, reading, and/or programming
of a specific memory cell on any adjacent memory cells in the
floating gate array.
Subclass:
185.03
Multiple values (e.g., analog):
Subject matter under 185.01 wherein the floating gate device
is adapted to store and operate on multiple-valued electrical
data signals.
SEE OR SEARCH THIS CLASS, SUBCLASS:
45 for analog data signals, per se.
168 for nonfloating gate device adapted to store and operate
on multiple-valued electrical data signals.
Subclass:
185.04
Data security:
Subject matter under 185.01 wherein the floating gate device
has an ability to secure or permanently preserve electric
data signals from being erased (e.g., by tampering or
overwriting) from memory cells.
(1) Note. For example, this subject matter may include
either an integral light shield to prevent memory cells from
being erased or circuit fuses which may secure the data.
SEE OR SEARCH THIS CLASS, SUBCLASS:
185.32 for radiation erasure details.
SEE OR SEARCH CLASS:
380, Cryptography, subclass 4 for digital data protection,
per se.
705, Data Processing: Financial, Business Practice,
Management, or Cost/Price Determination, subclasses 51-54
for usage protection of a distributed data file.
Subclass:
185.05
Particular connection:
Subject matter under 185.01 wherein the floating gate device
is enabled to form a connection or perform a switchable
function.
(1) Note. For example, this subject matter may include a
particular decoder.
SEE OR SEARCH THIS CLASS, SUBCLASS:
64 for an innerconnection arrangement, per se.
189.08 for an array capable of performing specified logic
functions.
SEE OR SEARCH CLASS:
326, Electronic Digital Logic Circuitry, 37 for
multifunction or programmable connection.
340, Communications: Electrical, 825.83 for programmable
selective matrix connection.
Subclass:
185.06
Segregated columns:
Subject matter under 185.05 wherein the connection within the
floating gate device has separate source and drain lines for
each column of memory cells, thereby each column's source and
drain lines are separate from and not shared with any other
column's source and drain lines.
Subclass:
185.07
Cross-coupled cell:
Subject matter under 185.05 wherein one or more floating gate
elements are directly wired in a cross-coupled circuit.
(1) Note. The floating gate element may function, for
example, as a switch or a load element.
(2) Note. Floating gate arrays that interact with and are
connected through data/bit lines to a separate cross-coupled
volatile static ram cell are not classified herein; for this
subject matter see SEARCH THIS CLASS, SUBCLASS below.
SEE OR SEARCH THIS CLASS, SUBCLASS:
185.08 for floating gate elements that interact with and are
connected through data/bit lines to a separate cross-coupled
volatile static ram cell.
Subclass:
185.08
With volatile signal storage device:
Subject matter under 185.05 wherein the floating gate device
is directly connected to exchange a signal between a separate
volatile signal storage device and itself.
(1) Note. For example, this subject matter may include a
separate volatile capacitor, a separate volatile SRAM cell,
etc.,
SEE OR SEARCH THIS CLASS, SUBCLASS:
154 for storage elements that are electrical bistable
multivibrators (i.e., flip-flops).
156 for employing devices having complementary (pnp and npn)
conductivity components.
228 for data preservation.
Subclass:
185.09
Error correction (e.g., redundancy, endurance):
Subject matter under 185.05 wherein the floating gate device
has a provision for the substitution of dysfunctional ("bad")
cells, either initially or from "wear-out" of an element or
array, or for prevention of the generation of bad cells.
(1) Note. This subject matter includes means for increasing
the "endurance" of an array.
SEE OR SEARCH CLASS:
714, Error Detection/Correction and Fault Detection/Recovery,
appropriate subclasses.
Subclass:
185.1
Extended floating gate:
Subject matter under 185.05 wherein two or more spatially
separated floating gate elements are connected by a common,
extended floating gate.
(1) Note. For example, programming means in the substrate
that are spatially separated from the main floating gate
transistor or a CMOS transistor pair share the same floating
gate.
Subclass:
185.11
Bank or block architecture:
Subject matter under 185.05 wherein a floating gate array is
divided into independently accessible groups of memory
cells.
(1) Note. Banks of memory cells (e.g., blocks) may be
separated through physical layout, particular decoding means,
particular wiring means, etc.
SEE OR SEARCH THIS CLASS, SUBCLASS:
230.03 for addressing plural banks or blocks, per se.
Subclass:
185.12
Parallel row lines (e.g., page mode):
Subject matter under 185.11 wherein one of the source or
drain lines in a floating gate array is parallel with the
word (control gate) line of a particular row so as to form a
row of accessible architecture.
(1) Note. A row of accessible architecture may be
separately accessed from the other rows.
Subclass:
185.13
Global word or bit lines:
Subject matter under 185.11 wherein a word (control gate)
line or a data bit (drain) line in a floating gate array
extends through a plurality of banks or blocks to form a
common connection or connections for at least a plurality of
the banks or blocks of the entire floating gate array.
(1) Note. This subject matter includes memories where the
floating gate array is the entire intact semiconductor wafer
and such lines that extend across the entire wafer.
Subclass:
185.14
Program gate:
Subject matter under 185.05 wherein an additional insulated
gate separate from the control gate provides programming or
erase functions.
Subclass:
185.15
Weak inversion injection:
Subject matter under 185.14 wherein use of an auxiliary
biased or floating gate to the source side of the main
floating gate induces a weak channel thereunder so as to
create a hot electron injection path in the channel for
programming the main floating gate.
(1) Note. This subject matter does not include an electrode
near the source which merely produces a standard channel
inversion.
Subclass:
185.16
Virtual ground:
Subject matter under 185.05 wherein all of the memory cells
in a column are connected in parallel by column lines, and
alternative column lines are either connected to ground or
switchable to a potential related to ground.
(1) Note. All of the internal columns of the memory cells
in the floating gate array share a common column line with an
adjacent column. Each internal column line is shared by two
columns of cells to reduce the number and size of the
connections.
Subclass:
185.17
Logic connection (e.g., NAND string):
Subject matter under 185.05 wherein the floating gate
elements are connected in a manner so as to form a logical
relationship.
(1) Note. For example, this subject matter includes a
particular logic (inclusion or exclusion between two
electrical signals) connection such as, but not limited to, a
series connection of a plurality of floating gate arrays to
form a (N)AND logic or a connection to form a (N)OR logic
function. This subject matter specifically includes the
"NAND string" memory architecture.
SEE OR SEARCH CLASS:
326, Electronic Digital Logic Circuitry, 104 for digital
logic circuitry, per se.
Subclass:
185.18
Particular biasing:
Subject matter under 185.01 wherein an operating environment
provides electrical settings to the floating gate device.
(1) Note. For example, particular biasing operations may
include erasing, programming, testing, and/or reading.
Subclass:
185.19
Multiple pulses (e.g., ramp):
Subject matter under 185.18 wherein the floating gate has a
particular biasing that comprises a series of pulses or a
pulse that varies at a constant rate.
(1) Note. The biasing is to enable a particular function
(e.g., programming, erasure, testing, verification, etc.)
Subclass:
185.2
Reference signal (e.g., dummy cell):
Subject matter under 185.18 wherein a data signal on the
floating gate is compared to a threshold level or a fixed
signal that acts as a constant for comparison to the data
signal.
(1) Note. This subject matter includes reference voltage
generation means for reading, programming, erasing, etc.
SEE OR SEARCH THIS CLASS, SUBCLASS:
210 for noise suppression by differential sensing using a
reference or dummy elements.
Subclass:
185.21
Sensing circuitry (e.g., current mirror):
Subject matter under 185.2 wherein a detailed circuit
arrangement compares a data signal to the reference signal
and delivers a resulting output signal.
SEE OR SEARCH CLASS:
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, 51 for particular structure of
sensing amplifiers, per se.
Subclass:
185.22
Verify signal:
Subject matter under 185.2 including the use of any
circuitry, procedure, or other means to verify that the data
signal has been properly written or erased from a memory
cell.
Subclass:
185.23
Drive circuitry (e.g., word line driver):
Subject matter under 185.18 including logic, power, and
switching circuitry necessary to drive a word line or bit
line of the floating gate device into any of its operational
modes.
Subclass:
185.24
Threshold setting (e.g., conditioning):
Subject matter under 185.18 wherein a particular process or
means is used in a floating gate device to set the threshold
to a predetermined value during either programming or
erasure.
SEE OR SEARCH CLASS:
257, Active Solid-State Devices (e.g., Transistors,
Solid-State Diodes), subclass 314 for substructure floating
gate memory device having a variable threshold (e.g., by
storage of charge in an insulator layer adjacent a channel).
Subclass:
185.25
Line charging (e.g., precharge, discharge, refresh):
Subject matter under 185.18 wherein the floating gate device
circuitry there is either a precharge, refresh, or a
discharge of the bit lines.
Subclass:
185.26
Floating electrode (e.g., source, control gate, drain):
Subject matter under 185.18 wherein one or more of the
source, control gate, drain, or substrate of a floating gate
device is left floating rather than being tied to a
potential.
Subclass:
185.27
Substrate bias:
Subject matter under 185.18 wherein the floating gate device
has a particular and significant biasing applied to the
substrate or isolated semiconductor well region.
(1) Note. This subject matter includes external potential
connections and may include internal charge pumps.
SEE OR SEARCH CLASS:
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, subclass 534 for particular substrate
biasing arrangements.
Subclass:
185.28
Tunnel programming:
Subject matter under 185.18 wherein the floating gate device
is programmed through a thin insulated region that provides a
charge tunnel to the floating gate.
(1) Note. For specific hot carrier injection mechanism
subject matter, see SEARCH THIS CLASS, SUBCLASS below.
SEE OR SEARCH THIS CLASS, SUBCLASS:
185.15 for hot carrier injections by a weak inversion
channel.
Subclass:
185.29
Erase:
Subject matter under 185.18 wherein an arrangement or process
is provided for reducing the net charge on memory cells on
the floating gate.
(1) Note. The convention of "removal of charges" (either
positive or negative) from the floating gate to reduce the
net charge thereon will be considered "erasure." "Erasure"
need not be on a complete block or bank to be considered
under this subject matter.
Subclass:
185.3
Over erasure:
Subject matter under 185.29 including the use of any
circuitry or means to measure or prevent over erasure of
memory cells (i.e., removal of more charge than is desired
for a particular logic level setting).
Subclass:
185.31
Nonsubstrate discharge:
Subject matter under 185.29 wherein the floating gate is
erased by overlying electrodes or other means not directly
connected to the substrate, and the charge carriers are not
directly removed to the substrate.
Subclass:
185.32
Radiation erasure:
Subject matter under 185.31 wherein electromagnetic wave
energy is used to erase an electric charge on the floating
gate.
(1) Note. Electromagnetic wave energy includes X-ray, gamma
ray, ultra violet, etc.
Subclass:
185.33
Flash:
Subject matter under 185.29 wherein the floating gate is
electrically erasable by block or bulk.
(1) Note. For Electrically Erasable Programmable Read Only
Memory (EEPROM) to be considered flash memory, it must be
erasable in blocks (e.g., erased as a whole or in a row or in
banks).
Subclass:
186
Single device per bit:
This subclass is indented under subclass 174. Subject matter
in which the storage element for one bit of information is
composed of a single semiconductive device.
Subclass:
187
Three devices per bit:
This subclass is indented under subclass 174. Subject matter
in which the storage element for one bit of information is
composed of three semiconductive devices.
Subclass:
188
Four or more devices per bit:
This subclass is indented under subclass 174. Subject matter
in which the storage element for one bit of information is
composed of four or more semiconductive devices.
Subclass:
189.01
READ/WRITE CIRCUIT:
This subclass is indented under the class definition.
Subject matter for inserting, extracting, or handling of an
information signal to be stored or retrieved.
(1) Note In this and its indented subclasses the term
"processing" as applied to signals is specifically intended
to excludedigital data processing systems and computer
systems
SEE OR SEARCH THIS CLASS, SUBCLASS:
51 for the physical arrangement of memory components.
52 for storage element hardware.
63 for interconnection arrangement for information
transfer.
230.01 for selection of memory locations.
SEE OR SEARCH CLASS:
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, 51 for miscellaneous amplitude
discriminating circuits having a sense amplifier.
340, Communications: Electrical, 825.79 for selective
matrix which may be used for control or as a switching
means.
370, Multiplex Communications, appropriate subclasses for
multiplex switching techniques similar to addressing or the
handling of memory information signals.
711, Electrical Computers and Digital Processing Systems:
Memory, 1 for addressing combined with specific memory
configurations (e.g., extended, expanded, dynamic, etc.) in a
digital data processing system, subclasses 100+ for
generalized address forming in a digital data processing
system, and subclasses 200+ for generalized storage accessing
and control in a digital data processing system.
Subclass:
189.02
Multiplexing:
This subclass is indented under subclass 189.01. Subject
matter which includes the transmission of plural signals over
a single signal path.
SEE OR SEARCH THIS CLASS, SUBCLASS:
230.02 for multiplexing of static memory address signals.
SEE OR SEARCH CLASS:
370, Multiplex Communications, 351 for pathfinding or
routing in multiplex communications which may include a
static memory read and write circuit.
Subclass:
189.03
Plural use of terminal:
This subclass is indented under subclass 189.01. Subject
matter which has a terminal connecting the memory to a data
handling circuit and another diverse circuit.
(1) Note. Such a diverse circuit may be an addressing,
power or testing circuit.
(2) Note. Circuits having different signal levels for
different functions are also found in this subclass.
SEE OR SEARCH THIS CLASS, SUBCLASS:
189.02 for multiplexing of data signals in a read/write
memory circuit.
230.02 for multiplexing of address signals in a memory
addressing circuit.
Subclass:
189.04
Simultaneous operations (e.g., read/write):
This subclass is indented under subclass 189.01. Subject
matter including circuitry for performing multiple operations
(e.g., storing information in and retrieving information from
the memory) at the same time.
SEE OR SEARCH THIS CLASS, SUBCLASS:
230.05 for an addressing circuit having plural address ports
for independent access.
SEE OR SEARCH CLASS:
370, Multiplex Communications, 276 for duplex communications
not limited to a static memory read and write circuit.
Subclass:
189.05
Having particular data buffer or latch:
This subclass is indented under subclass 189.01. Subject
matter including a specific detail of a temporary storage
circuit for a data signal.
SEE OR SEARCH THIS CLASS, SUBCLASS:
205 for a specific sense amplifier circuit in a memory
system.
230.08 for a feature of an address buffer or latch.
Subclass:
189.06
Including signal clamping:
This subclass is indented under subclass 189.01. Subject
matter including circuitry for limiting the variation of a
signal (e.g., voltage) in order to keep such variation at a
predetermined level.
SEE OR SEARCH CLASS:
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, 309 for miscellaneous clamping
circuits.
Subclass:
189.07
Including signal comparison:
This subclass is indented under subclass 189.01. Subject
matter including circuitry to compare plural signal in order
to control an operation of the system on a data signal.
SEE OR SEARCH THIS CLASS, SUBCLASS:
49 for a comparator in a content addressable memory.
205 and 206+, for comparison between stored data and a
reference voltage or value.
SEE OR SEARCH CLASS:
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, 1 for miscellaneous signal comparing
circuits.
Subclass:
189.08
Including specified plural element logic arrangement:
This subclass is indented under subclass 189.01. Subject
matter describing the configuration of multiple logic devices
which handle the information signal.
SEE OR SEARCH CLASS:
326, Electronic Digital Logic Circuitry, appropriate
subclasses for electronic digital logic circuitry.
Subclass:
189.09
Including reference or bias voltage generator:
This subclass is indented under subclass 189.01. Subject
matter including a particular voltage or bias source.
SEE OR SEARCH THIS CLASS, SUBCLASS:
210 for an element used to generate reference voltage for a
sense amplifier.
SEE OR SEARCH CLASS:
323, Electricity: Power Supply or Regulation Systems, 311
for a self-regulating reference or bias circuit.
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, 530 for miscellaneous circuits having
significant bias circuitry.
Subclass:
189.11
Including level shift or pull-up circuit:
This subclass is indented under subclass 189.01. Subject
matter including a circuit element which makes an adjustment
in the voltage level of an information signal to enhance
driving capability.
SEE OR SEARCH CLASS:
326, Electronic Digital Logic Circuitry, subclass 88 and 92
for logic circuits with bootstrapping.
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, subclass 390 and 589 for
miscellaneous circuits utilizing bootstrapping.
Subclass:
189.12
With shift register:
This subclass is indented under subclass 189.01. Subject
matter including a circuit which sequentially shifts the data
information signal between one element and another in a
memory array in a serial manner.
SEE OR SEARCH THIS CLASS, SUBCLASS:
78 for a plural shift register memory device.
219 and 221, for a serial memory device.
238 for memory addressing circuitry including a shift
register.
SEE OR SEARCH CLASS:
377, Electrical Pulse Counters, Pulse Dividers, or Shift
Registers: Circuits and Systems, subclass 57 and 64 for
structure or circuitry of a shift register, not limited to a
static memory system.
Subclass:
190
For complementary information:
This subclass is indented under subclass 189.01. Subject
matter wherein the read/write circuit is used with a memory
cell containing complementary information.
SEE OR SEARCH THIS CLASS, SUBCLASS:
204 for flip-flops used for sensing in a read/write
circuit.
207 for differential sensing.
SEE OR SEARCH CLASS:
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, 545 for miscellaneous bias circuits
with signal protection or bias preservation.
Subclass:
191
Signals:
This subclass is indented under subclass 189.01. Subject
matter where particular signals are used for writing,
maintaining, or reading information.
SEE OR SEARCH THIS CLASS, SUBCLASS:
230.01 for addressing a particular memory.
Subclass:
192
Radio frequency:
This subclass is indented under subclass 191. Subject matter
where the particular signal is a radio frequency signal.
Subclass:
193
Strobe:
This subclass is indented under subclass 191. Subject matter
where the particular signal is used for strobing the memory
device.
Subclass:
194
Delay:
This subclass is indented under subclass 191. Subject matter
where the particular signal is delayed during writing or
reading.
SEE OR SEARCH THIS CLASS, SUBCLASS:
76 for recirculation stores used as delay lines.
93 for magnetic shift registers including delay means.
Subclass:
195
Inhibit:
This subclass is indented under subclass 191. Subject matter
where an inhibit operation is used to prevent the writing or
reading of information.
Subclass:
196
Sense/inhibit:
This subclass is indented under subclass 195. Subject matter
where the same conductor is used for both an inhibit
operation and a sensing operation during different time
periods.
Subclass:
197
Microwave:
This subclass is indented under subclass 191. Subject matter
where the particular signal is in the microwave range.
Subclass:
198
Transmission:
This subclass is indented under subclass 191. Subject matter
where transmission line signals and principles are used for
writing or reading information.
SEE OR SEARCH CLASS:
333, Wave Transmission Lines and Networks, for nonstorage of
information, note subclass 12.
Subclass:
199
Coincident A.C. signal with pulse:
This subclass is indented under subclass 191. Subject matter
where the particular signal is the combination of an A.C.
signal and pulse signal.
Subclass:
200
Bad bit:
This subclass is indented under subclass 189.01. Subject
matter in which erroneous, defective, or partially defective
storage locations are used to store information.
SEE OR SEARCH CLASS:
714, Error Detection/Correction and Fault Detection/Recovery,
5 for memory or peripheral subsystem affected recovery,
subclass 42 for memory or storage device component fault, and
subclass 54 for storage content error reliability testing in
digital data processing systems, subclass 710 and 711 for
fault recovery of a memory system; subclasses 718+ for
diagnostic testing of a memory system, and subclasses 763+
for digital data error correction during memory access.
Subclass:
201
Testing:
This subclass is indented under subclass 189.01. Subject
matter including the specifics of the memory which are tested
for defects or erroneous information.
SEE OR SEARCH THIS CLASS, SUBCLASS:
200 where defective memory devices are used to store
information.
SEE OR SEARCH CLASS:
324, Electricity: Measuring and Testing, subclass 34 for
testing of magnetic properties.
714, Error Detection/Correction and Fault Detection/Recovery,
5 for memory or peripheral subsystem affected recovery,
subclass 42 for memory or storage device component fault, and
subclass 54 for storage content error reliability testing in
digital data processing systems, and subclasses 718+ for
diagnostic testing of a memory system.
Subclass:
202
Complementing/balancing:
This subclass is indented under subclass 189.01. Subject
matter in which complementing or balancing signals are used
in a read/write circuit, e.g., a storage system having an
auxiliary storage circuit for complementary signals to be
used for noise cancellation.
SEE OR SEARCH CLASS:
333, Wave Transmission Lines and Networks, subclass 4 for
plural channel systems with balanced circuits, subclass 25
for coupling networks with balanced circuits.
Subclass:
203
Precharge:
This subclass is indented under subclass 189.01. Subject
matter wherein circuit lines or elements are charged (or
discharged) to a desired level just prior to reading or
writing information.
SEE OR SEARCH THIS CLASS, SUBCLASS:
149 and 150, for information stored in the form of a
charge.
SEE OR SEARCH CLASS:
307, Electrical Transmission or Interconnection Systems,
subclass 109 for miscellaneous transmission or
interconnection capacitor circuits.
320, Electricity: Battery or Capacitor Charging or
Discharging, 166 for capacitor charging or discharging, per
se.
Subclass:
204
Accelerating charge or discharge:
This subclass is indented under subclass 189.01. Subject
matter wherein a circuit senses a charging (or discharging)
operation and switches in a parallel path to decrease the
charging (or discharging) time.
SEE OR SEARCH THIS CLASS, SUBCLASS:
149 and 150, for charging and discharging information
stores.
203 for precharging circuit lines or elements.
SEE OR SEARCH CLASS:
307, Electrical Transmission or Interconnection Systems,
subclass 109 for miscellaneous transmission or
interconnection capacitor circuits.
320, Electricity: Battery or Capacitor Charging or
Discharging, 166 for capacitor charging or discharging, per
se.
Subclass:
205
Flip-flop used for sensing:
This subclass is indented under subclass 189.01. Subject
matter wherein the sensing circuit is a flip-flop circuit.
SEE OR SEARCH THIS CLASS, SUBCLASS:
154 for flip-flop used as storage elements in a memory
system.
190 for read/write circuits used in a memory system that
contains flip-flop storage elements.
207 for differential sensing.
SEE OR SEARCH CLASS:
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, 185 and particularly subclasses 199+
for miscellaneous flip-flop circuits.
Subclass:
206
Noise suppression:
This subclass is indented under subclass 189.01. Subject
matter having circuits for the cancellation or reduction of
noise or spurious signals.
Subclass:
207
Differential sensing:
This subclass is indented under subclass 206. Subject matter
where the circuit used is of the differential sensing type.
Subclass:
208
Semiconductors:
This subclass is indented under subclass 207. Subject matter
where the differential sensing is performed upon a
semiconductor memory element.
Subclass:
209
Magnetic:
This subclass is indented under subclass 207. Subject matter
where the differential sensing is performed upon a magnetic
memory element.
Subclass:
210
Reference or dummy element:
This subclass is indented under subclass 209. Subject matter
where the magnetic differential sensing circuit uses an
additional magnetic element.
Subclass:
211
Temperature compensation:
This subclass is indented under subclass 206. Subject matter
where the circuit used is for compensating temperature
changes.
Subclass:
212
Semiconductor:
This subclass is indented under subclass 211. Subject matter
where the temperature compensation is performed upon a
semiconductor memory element.
Subclass:
213
Magnetic:
This subclass is indented under subclass 211. Subject matter
where the temperature compensation is performed upon a
magnetic memory element.
Subclass:
214
Particular wiring:
This subclass is indented under subclass 206. Subject matter
where the circuit includes wiring the elements in a
particular arrangement to obtain noise cancellation.
SEE OR SEARCH THIS CLASS, SUBCLASS:
63 which may or may not include noise cancellation.
Subclass:
215
Optical:
This subclass is indented under subclass 189.01. Subject
matter in which the read/write circuit if for an optical
storage system.
SEE OR SEARCH THIS CLASS, SUBCLASS:
106 for radiant energy information storage.
120 for information masking in an optical storage system.
Subclass:
216
Holos:graphic:
This subclass is indented under subclass 215. Subject matter
wherein the circuit is used to read/write holos:graphic
memories.
SEE OR SEARCH THIS CLASS, SUBCLASS:
125 for information masking which uses holograms.
SEE OR SEARCH CLASS:
235, Registers, subclass 457 for holos:graphic card
readers.
359, Optics: Systems (Including Communication) and Elements,
1 for storage systems where there is a holos:graphic storage
medium storing information signal absent any electrical
circuitry.
Subclass:
217
Electron beam:
This subclass is indented under subclass 189.01. Subject
matter in which the read/write circuit is for an electron
beam storage system.
SEE OR SEARCH THIS CLASS, SUBCLASS:
237 for addressing a memory with an electron beam.
Subclass:
218
Erase:
This subclass is indented under subclass 189.01. Subject
matter in which the read/write circuit is or includes an
erase circuit for a storage system.
Subclass:
219
SiPo/PiSo:
This subclass is indented under subclass 189.01. Subject
matter in which the read/write circuit for memory provides
Serial Input with Parallel Output or Parallel Input with
Serial Output.
SEE OR SEARCH THIS CLASS, SUBCLASS:
238 for Cartesian memories in which all of the above
concepts may be present.
SEE OR SEARCH CLASS:
340, Communications: Electrical, 825.79 for logic and
switching circuits having a matrix form with various
input/output capability.
Subclass:
220
Parallel read/write:
This subclass is indented under subclass 189.01. Subject
matter wherein information is written into a memory in
parallel form and read out in parallel form.
SEE OR SEARCH THIS CLASS, SUBCLASS:
235 for addressing optical memory locations simultaneously.
Subclass:
221
Serial read/write:
This subclass is indented under subclass 189.01. Subject
matter wherein information is written into a memory in serial
form and read out in serial form.
SEE OR SEARCH THIS CLASS, SUBCLASS:
73 for recirculation memories which are usually read and
written in this manner.
Subclass:
222
Data refresh:
This subclass is indented under subclass 189.01. Subject
matter wherein decaying information is read before it becomes
unrecognizable, and rewritten in original form, e.g., charge
on a capacitor is read before too much has leaked off, then
rewritten to a fully charged state.
SEE OR SEARCH THIS CLASS, SUBCLASS:
149 for capacitor stores which require refresh.
183 for charge coupled stores which require refresh.
Subclass:
223
Bridge:
This subclass is indented under subclass 189.01. Subject
matter where the sensing circuit is in the form of a bridge
circuit.
SEE OR SEARCH CLASS:
323, Electricity: Power Supply or Regulation Systems,
subclass 365 for bridge arrangement used in electric storage
discharge device.
324, Electricity: Measuring and Testing, subclass 98 for
balancing bridge electricity.
333, Wave Transmission Lines and Networks, appropriate
subclass for bridge type networks.
Subclass:
224
Eddy current:
This subclass is indented under subclass 189.01. Subject
matter having circuits containing Eddy currents.
SEE OR SEARCH CLASS:
324, Electricity: Measuring and Testing, subclass 40 for
measuring Eddy currents.
Subclass:
225
Minor loop:
This subclass is indented under subclass 189.01. Subject
matter where the read/write circuit results in the operation
of a magnetic memory element or any hysteresis loop other
than the major loop.
(1) Note. Excluded are circuits which contain a
multiaperture magnetic memory element.
Subclass:
225.5
Including magnetic element:
This subclass is indented under subclass 189.01. Subject
matter in which the read/write circuit includes a magnetic
element.
SEE OR SEARCH THIS CLASS, SUBCLASS:
230.07 for an address decoder circuit having a magnetic
element.
243.5 for a memory address selection circuit having a
magnetic element.
SEE OR SEARCH CLASS:
307, Electrical Transmission or Interconnection Systems, 401
for a nonlinear reactor system.
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, 190 for a stable state circuit with
transformer or saturable core device.
336, Inductor Devices, appropriate subclasses for structure
of a magnetic circuit element.
Subclass:
225.6
Having bipolar circuit element:
This subclass is indented under subclass 189.01. Subject
matter including a semiconductor element having plural
potential barriers (i.e., junctions).
(1) Note. Circuits with only named bipolar devices are
included in this subclass.
SEE OR SEARCH CLASS:
326, Electronic Digital Logic Circuitry, appropriate
subclasses for logic circuits utilizing bipolar devices.
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, 574 for miscellaneous circuits
utilizing bipolar transistors.
Subclass:
225.7
Having fuse element:
This subclass is indented under subclass 189.01. Subject
matter wherein the circuit includes a circuit element which
is selectively melted or disintegrated to make or break an
electric circuit to control the operating characteristics of
a memory read or write circuit.
SEE OR SEARCH THIS CLASS, SUBCLASS:
96 for a memory system including data storage by a fusible
memory element.
200 for a memory system including a redundant or spare
element and having a fuse circuit which selectively activates
or deactivates certain circuit elements.
SEE OR SEARCH CLASS:
326, Electronic Digital Logic Circuitry, 37 for a
programmable logic circuit.
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, subclass 525 for a miscellaneous
circuit with a fusible link.
340, Communications: Electrical, subclass 825.84 for a
selective matrix having programmable fusible elements.
438, Semiconductor Device Manufacturing: Process,
particularly subclass 467, 600, and 601 for methods of
altering the conductivity of a fuse or antifuse element
associated with a semiconductor integrated circuit.
Subclass:
226
POWERING:
This subclass is indented under the class definition.
Subject matter having powering concepts relating to
memories.
(1) Note. This class excludes power supplies, per se, which
may be used for a memory system. See Classes 307, 327, 330,
and 363 for power supplies.
Subclass:
227
Conservation of power:
This subclass is indented under subclass 226. Subject matter
having means for reduction of operational power during the
memory standby phase.
Subclass:
228
Data preservation:
This subclass is indented under subclass 226. Subject matter
which includes concepts relevant to prevention of loss of
data in a storage device, e.g., prevention of data loss by
provision of backup storage means.
SEE OR SEARCH CLASS:
714, Error Detection/Correction and Fault Detection/Recovery,
710 for fault recovery of a memory system and subclasses
718+ for diagnostic testing of a memory system.
Subclass:
229
Standby power:
This subclass is indented under subclass 228. Subject matter
in which data loss is prevented by using a secondary
(standby) power supply during housepower interruptions.
Subclass:
230.01
ADDRESSING:
This subclass is indented under the class definition.
Subject matter including selection of a memory location.
SEE OR SEARCH THIS CLASS, SUBCLASS:
189.01 for the reading or writing of information in a memory
system.
SEE OR SEARCH CLASS:
326, Electronic Digital Logic Circuitry, 105 for digital
logic decoding circuits, in general, and subclasses 62+ for
buffer arrangements which convert logic signals between
diverse logic devices broadly described as addressing
electrical memory stores, but not including specific
circuitry to store information in, or retrieve information
from, a memory.
340, Communications: Electrical, 825.79 for selective
matrix which may be used for control or as a switching
means.
370, Multiplex Communications, appropriate subclasses for
multiplex switching techniques similar to addressing or the
handling of memory information signals.
711, Electrical Computers and Digital Processing Systems:
Memory, 1 for addressing combined with specific memory
configurations (e.g., extended, expanded, dynamic, etc.) in a
digital data processing system, subclasses 100+ for
generalized address forming in a digital data processing
system, and subclasses 200+ for generalized storage accessing
and control in a digital data processing system.
Subclass:
230.02
Multiplexing:
This subclass is indented under subclass 230.01. Subject
matter which includes the transmission of plural signals over
a single signal path.
SEE OR SEARCH THIS CLASS, SUBCLASS:
189.02 in which the data signal rather than the address
signal is multiplexed.
SEE OR SEARCH CLASS:
370, Multiplex Communications, 351 for pathfinding or
routing in multiplex communications not limited to a static
memory addressing circuit.
Subclass:
230.03
Plural blocks or banks:
This subclass is indented under subclass 230.01. Subject
matter in which the memory elements are arranged in plural
separate and distinct groups and in which at least one
element from one of the groups is selectively accessed.
SEE OR SEARCH CLASS:
711, Electrical Computers and Digital Processing Systems:
Memory, subclass 2 for extended/expanded memory addressing,
subclass 5 for multiple memory module static memory
addressing in a digital data processing system, subclasses
101+ for storage accessing and control combined with specific
memory configurations (e.g., ROM, RAM, core, CAM, DASD,
bubble, dynamic, etc.) in a digital data processing system,
subclasses 117+ for generalized storage accessing and control
of hierarchical memory arrangements in a digital data
processing system, subclasses 147+ for shared memory storage
accessing and control in a digital data processing system,
and subclasses 200+ for generalized address forming in a
digital data processing system.
Subclass:
230.04
Alternate addressing (e.g., even/odd):
This subclass is indented under subclass 230.03. Subject
matter which successively addresses memory elements in
different blocks or banks.
Subclass:
230.05
Multiple port access:
This subclass is indented under subclass 230.01. Subject
matter having plural address circuits for independent memory
access.
SEE OR SEARCH THIS CLASS, SUBCLASS:
189.04 for memory circuits in which two or more operations
(e.g., read and write) are performed simultaneously.
Subclass:
230.06
Particular decoder or driver circuit:
This subclass is indented under subclass 230.01. Subject
matter including a detail of a circuit which either changes a
binary combination of memory address signals to form a
selection or actuation signal, or which increases the
magnitude of such an actuation signal.
(1) Note. Mere naming of a decoder or driver circuit is
not, of itself, basis for classification in this subclass.
SEE OR SEARCH CLASS:
326, Electronic Digital Logic Circuitry, 105 for this
subject matter not limited to a memory system.
Subclass:
230.07
Including magnetic element:
This subclass is indented under subclass 230.06. Subject
matter in which a memory decoder or driver circuit includes a
magnetic element.
SEE OR SEARCH THIS CLASS, SUBCLASS:
225.5 for a read/write circuit having a magnetic element.
243.5 for a memory address selection circuit having a
magnetic element.
SEE OR SEARCH CLASS:
307, Electrical Transmission or Interconnection Systems, 401
for a nonlinear reactor system.
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, 190 for a stable state circuit
utilizing a transformer or saturable core device.
336, Inductor Devices, appropriate subclasses for structure
of a magnetic circuit element.
Subclass:
230.08
Including particular address buffer or latch circuit
arrangement:
This subclass is indented under subclass 230.01. Subject
matter including a detail of a temporary storage device for
an address and selection signal.
SEE OR SEARCH THIS CLASS, SUBCLASS:
189.05 for a feature of a data buffer or latch, which may be
combined with an address buffer or latch.
Subclass:
230.09
Combined random and sequential addressing:
This subclass is indented under subclass 230.01. Subject
matter including switching to permit the access to the
storage elements either selectively or successively.
Subclass:
231
Using selective matrix:
This subclass is indented under subclass 230.01. Subject
matter where at least a single matrix is used to select a
memory location.
SEE OR SEARCH CLASS:
340, Communications: Electrical, 825.79 for selective
matrices, per se.
Subclass:
232
Magnetic:
This subclass is indented under subclass 231. Subject matter
where the elements of the selective matrix are magnetic.
Subclass:
233
Sync/clocking:
This subclass is indented under subclass 230.01. Subject
matter where synchronizing and clocking circuits are used to
select a memory location.
Subclass:
233.5
Transition detection:
This subclass is indented under subclass 233. Subject matter
which generates a clock or timing signal responsive to a
change in an input signal.
Subclass:
234
Optical:
This subclass is indented under subclass 230.01. Subject
matter having circuits for deflecting an optical beam to a
particular memory location.
SEE OR SEARCH THIS CLASS, SUBCLASS:
215 for read/write circuits using optics.
Subclass:
235
Page memories:
This subclass is indented under subclass 234. Subject matter
wherein memory locations in a plane are addressed
simultaneously.
SEE OR SEARCH THIS CLASS, SUBCLASS:
106 for particular radiant energy memories.
120 for optical memories involving informational masking.
215 for optical reading and writing.
SEE OR SEARCH CLASS:
359, Optics: Systems (Including Communication) and Elements,
for appropriate systems and elements, in particular 1 for
holos:graphic storage.
Subclass:
236
Counting:
This subclass is indented under subclass 230.01. Subject
matter wherein a memory location is addressed by counting
locations to determine when the selected one is reached,
e.g., counting matrix rows to address the desired row.
SEE OR SEARCH THIS CLASS, SUBCLASS:
238 where all rows (columns) of a memory plane are addressed
simultaneously.
239 for selection of locations sequentially.
SEE OR SEARCH CLASS:
377, Electrical Pulse Counters, Pulse Dividers, or Shift
Registers: Circuits and Systems, for solid-state counter
circuits.
Subclass:
237
Electron beam:
This subclass is indented under subclass 230.01. Subject
matter for addressing a memory device with an electron beam.
SEE OR SEARCH THIS CLASS, SUBCLASS:
217 for read/write circuits in an electron beam storage
system.
SEE OR SEARCH CLASS:
315, Electric Lamp and Discharge Devices: Systems, 8.51 for
electron beam storage systems in general, subclasses 364+ for
cathode-ray tube (CRT) deflection circuits.
377, Electrical Pulse Counters, Pulse Dividers, or Shift
Registers: Circuits and Systems, subclass 99 for counters
using beam type tubes.
Subclass:
238
Cartesian memories:
This subclass is indented under subclass 230.01. Subject
matter wherein all columns (or rows) of a memory plane are
addressed simultaneously.
SEE OR SEARCH THIS CLASS, SUBCLASS:
235 for information stored similarly in optical memories.
SEE OR SEARCH CLASS:
340, Communications: Electrical, 825.79 for switching
matrices.
Subclass:
238.5
Byte or page addressing:
This subclass is indented under subclass 230.01. Subject
matter which addresses a group of memory elements or a
plurality of such groups as a single unit.
(1) Note. The information stored in each of such elements
often represents a binary digit ("bit") and the information
stored in such a group of memory elements represents digital
words or bytes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
220 for a parallel read/write circuit.
230.03 for addressing of plural blocks or banks of memory.
238 for a Cartesian memory address circuit.
Subclass:
239
Sequential:
This subclass is indented under subclass 230.01. Subject
matter where the memory locations are sequenced one after
another in an addressing circuit.
SEE OR SEARCH THIS CLASS, SUBCLASS:
236 for addressing memory locations by counting techniques.
238 for addressing simultaneously all columns (rows) of a
memory plane.
Subclass:
240
Using shift register:
This subclass is indented under subclass 239. Subject matter
where the means for sequencing is a shift register.
Subclass:
241
Detectors:
This subclass is indented under subclass 239. Subject matter
where the memory locations are detected one after another.
Subclass:
242
Current steering:
This subclass is indented under subclass 230.01. Subject
matter having means for determining a current or voltage path
to select a memory location.
Subclass:
243
Diode:
This subclass is indented under subclass 242. Subject matter
where the means is a diode(s).
Subclass:
243.5
Including magnetic element:
This subclass is indented under subclass 230.01. Subject
matter in which an address circuit includes a magnetic
element.
SEE OR SEARCH THIS CLASS, SUBCLASS:
225.5 for a read/write circuit having a magnetic element.
230.07 for an address decoder circuit having a magnetic
element.
SEE OR SEARCH CLASS:
307, Electrical Transmission or Interconnection Systems, 401
for a nonlinear reactor system.
327, Miscellaneous Active Electrical Nonlinear Devices,
Circuits, and Systems, 190 for a stable state circuit
utilizing a transformer or saturable core device.
336, Inductor Devices, appropriate subclasses for structure
of a magnetic circuit element.
Subclass:
244
MISCELLANEOUS:
This subclass is indented under the class definition.
Subject matter not provided for above.
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