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CLASS 708,  ELECTRICAL COMPUTERS: ARITHMETIC PROCESSING AND CALCULATING 
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SECTION I  CLASS DEFINITION
GENERAL STATEMENT OF THE CLASS SUBJECT MATTER
This is the generic class for electrical apparatus and corresponding methods for performing calculation operations.
SCOPE OF THE CLASS
(1) Note. This class is limited to electrical and calculating computer apparatus and corresponding methods wherein a calculation operation is performed on information carried by wave propagation (either electromagnetic or compressional waves) provided that input to and output from the apparatus is electrical. Note: where the apparatus performing the calculation operation is electrically responsive but the data is not presented to and output from the apparatus as electrical signals, classification is with the appropriate wave energy subject matter, as per one of the optical classes. 
(2) Note. Significantly claimed apparatus external to this class, claimed in combination with apparatus under the class definition, which perform data processing or calculation operations are classified in the class appropriate to the external device unless specifically excluded therefrom. 
(3) Note. Nominally claimed apparatus external to this class in combination with apparatus under the class definition is classified in this class unless provided for in the appropriate external class. 
THIS CLASS IS STRUCTURED INTO THREE MAIN DIVISIONS:
A. Electrical Hybrid Calculating Computers
B. Electrical Digital Calculating Computers
C. Electrical Analog Calculating Computers
SECTION II  REFERENCES TO OTHER CLASSES
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235,  Registers, various subclasses for basic machines and associated indicating mechanisms for ascertaining the number of movements of various devices and machines, plus machines made from these basic machines alone (e.g., cash registers, voting machines)or in combination with various perfecting features, such as printers and recording means, as well as for various data bearing record controlled systems. 
307,  Electrical Transmission or Interconnection Systems, various subclasses for generic residual electrical transmission or interconnection systems and miscellaneous circuits. 
326,  Electronic Digital Logic Circuitry, various subclasses for digital logic devices. 
327,  Miscellaneous Active Electrical Nonlinear Devices, Circuit, and Systems, various subclasses for miscellaneous active device analog circuits. 
340,  Communications: Electrical, various subclasses for residual electrical communication systems. 
341,  Coded Data Generation or Conversion, various subclasses for electrical pulse and digital code converters. 
345,  Computer Graphics Processing and Selective Visual Display Systems, various subclasses for the selective control of two or more light generating or light controlling display elements in accordance with a received image signal. 
358,  Facsimile and Static Presentation Processing, subclasses 1.1 through 1.18for static presentation processing (e.g., processing data for printer, etc.). 
359,  Optics: Systems and Elements, subclasses 107+ for optical computing without diffraction and subclasses 237+ for optical modulators. 
360,  Dynamic Magnetic Information Storage or Retrieval, appropriate subclasses for record carriers and systems wherein information is stored and retrieved by interaction with a medium and there is relative motion between a medium and a transducer, for example, magnetic disk drive devices and control thereof, per se. 
361,  Electricity: Electrical Systems and Devices, subclasses 679.08 through 679.2for computer related housing or mounting assemblies with keyboard support. 
365,  Static Information Storage and Retrieval, various subclasses for addressable static singular storage elements or plural singular storage elements of the same type. 
369,  Dynamic Information Storage or Retrieval, various subclasses for record carriers and systems wherein information is stored and retrieved by interaction with a medium and there is relative motion between a medium and a transducer. 
370,  Multiplex Communications, various subclasses for generic multiplexing and demultiplexing systems. 
375,  Pulse or Digital Communications, various subclasses for generic pulse or digital communication systems. 
377,  Electrical Pulse Counters, Pulse Dividers, or Shift Registers: Circuits and Systems, various subclasses for generic circuits for pulse counting. 
379,  Telephonic Communications, various subclasses for twoway electrical communication of intelligible audio information of arbitrary content over a link including an electrical conductor. 
382,  Image Analysis, appropriate subclasses for operations performed on image data with the aim of measuring a characteristic of an image, detecting variations, detecting structures, or transforming the image data, and for procedures for analyzing and categorizing patterns present in image data. 
700,  Data Processing: Generic Control Systems or Specific Applications, subclasses 1 through 89for generic data processing control systems and subclasses 90306 for particular application of electrical computers and data processing systems, particularly subclasses 245264 for data processing of robot control systems. 
701,  Data Processing: Vehicles, Navigation, and Relative Location, appropriate subclasses for vehicular or navigational data processing. 
702,  Data Processing: Measuring, Calibrating, or Testing, appropriate subclasses for measuring or testing data processing. 
703,  Data Processing: Structural Design, Modeling, Simulation, and Emulation, appropriate subclasses. 
704,  Data Processing: Speech Signal Processing, Linguistics, Language Translation, and Audio Compression/Decompression, for speech, language or audio compression/decompression processing. 
705,  Data Processing: Financial, Business Practice, Management, or Cost/Price Determination, appropriate subclasses for data processing related to business, finances, management, or cost/price determining. 
706,  Data Processing: Artificial Intelligence, appropriate subclasses for processing of artificial intelligence. 
707,  Data Processing: Databases and File Management, or Data Structures, appropriate subclasses for database structure, database/file management, or document processing. 
709,  Electrical Computers and Digital Processing Systems: Multicomputer Data Transferring or Plural Processor Synchronizaion, appropriate subclasses for computers and digital processing related to plural computers or plural process coordinating. 
710,  Electrical Computers and Digital Data Processing Systems: Input/Output, appropriate subclasses for input/output processing (e.g., bus processing) in a computer or digital data processing system. 
711,  Electrical Computers and Digital Processing Systems: Memory, appropriate subclasses for storage accessing, control, or addressing in a computer or digital processing system. 
712,  Electrical Computers and Digital Processing Systems: Processing Architectures and Instruction Processing (e.g., Processors), appropriate subclasses for computer or digital processing system architecture or instruction processing. 
713,  Electrical Computers and Digital Processing Systems: Support, appropriate subclasses for computer or digital processing system support (e.g., security, power supply, and timing, etc. ) 
714,  Error Detection/Correction and Fault Detection/Recovery, appropriate subclasses for error or fault detection or compensation in a computer or digital processing system. 
716,  ComputerAided Design and Analysis of Circuits and Semiconductor Masks, appropriate subclasses. 
717,  Data Processing: Software Development, Installation, and Management, appropriate subclasses. 
SECTION III  GLOSSARY
CALCULATION OPERATIONS
Arithmetic or some limited logic operations performed upon or with signals representing numbers or values. These include arithmetic and related logic operations. A related logic operation is one that is associated with arithmetic computations.
DISCRETE ELECTRICAL SIGNAL
Discontinuous signals which can assume only a finite number of states.
NUMERICAL DIGITS
Symbols that represent a specific quantity or amount of units.
SUBCLASSES
1  ELECTRICAL HYBRID CALCULATING COMPUTER:  
This subclass is indented under the class definition. Subject matter wherein a calculation operation is performed
either simultaneously or sequentially upon at least one analog and
at least one digital signal or wherein either the analog or digital
signal is involved in a calculation operation on the other signal.
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2  Plural complete computers: 
This subclass is indented under subclass 1. Subject matter which includes at least one complete analog computer and one complete digital computer.  
3  Particular function performed:  
This subclass is indented under subclass 1. Subject matter directed to a particular function performed
by hybrid computer or subcombination thereof in making computation.
 
4  Evaluation of trigonometric function:  
This subclass is indented under subclass 3. Subject matter wherein the function performed is the processing
of signal to either determine a trigonometric relationship or to
operate on a signal in accordance with a trigonometric relationship.
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5  Correlation, convolution, or transformation:  
This subclass is indented under subclass 3. Subject matter wherein the function performed is crosscorrelation,
autocorrelation, crossconvolution, autoconvolution or transforming
a given representation of a data signal to another representation
without loss of information by an orthogonal transformation.
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6  Integration or differentiation:  
This subclass is indented under subclass 3. Subject matter wherein the function performed is integration
or differentiation of at least one of a plurality of input signals.
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7  Multiplication or division:  
This subclass is indented under subclass 3. Subject matter wherein the function performed is multiplication
or division to produce a product or quotient from at least two input
signals.
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8  Function generation:  
This subclass is indented under subclass 3. Subject matter wherein the function performed is the generation
of at least one signal by mathematical operation or as part of a
mathematical operation generates a signal representing a function
of at least one variable input parameter.
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9  Piecewise linear synthesis:  
This subclass is indented under subclass 8. Subject matter wherein the desired function is approximated
by a series of segments of straight lines.
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100  ELECTRICAL DIGITAL CALCULATING COMPUTER:  
This subclass is indented under the class definition. Subject matter wherein a calculation operation is performed
upon discrete electrical signals representing a value normally described by
numerical digits.
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101  Pulse repetition rate:  
This subclass is indented under subclass 100. Subject matter wherein quantities are determinable from
the pulse repetition frequency of the discrete electrical signal.
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102  Digital differential analyzer:  
This subclass is indented under subclass 101. Subject matter utilized as a digital differential analyzer.
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103  Multiplication or division:  
This subclass is indented under subclass 101. Subject matter wherein the operation performed on an electrical
signal is multiplication or division.
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104  Plural complete computers:  
This subclass is indented under subclass 100. Subject matter which includes at least two complete digital
computers.
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105  Combined with diverse art device:  
This subclass is indented under subclass 100. Subject matter which includes a diverse art device having
a noncalculating function, with common structure utilized in performing
the calculating and the noncalculating functions, or an integrated
unit into which the computer and diverse art device are embodied.
 
106  Checkbook:  
This subclass is indented under subclass 105. Subject matter where the diverse device is a checkbook.
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107  Writing instrument (e.g., pen):  
This subclass is indented under subclass 105. Subject matter where the diverse device is utilized for
a handheld marking purpose.
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108  Tape recorder:  
This subclass is indented under subclass 105. Subject matter where the diverse device is a tape recorder.
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109  Communication device (e.g., telephone, radio, television):  
This subclass is indented under subclass 105. Subject matter where the diverse device transfers information
between distant points.
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110  Business device (e.g., billing, memorandum):  
This subclass is indented under subclass 105. Subject matter where the diverse device is used in the conducting
of trade.
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111  Horological device:  
This subclass is indented under subclass 105. Subject matter where the diverse device measures or indicates
time.
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112  Calendar:  
This subclass is indented under subclass 111. Subject matter where the horological device provides indication
of a day of the week or a date.
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130  Programmable calculator:  
This subclass is indented under subclass 100. Subject matter which includes a calculator that is programmable.
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131  Having specialized input:  
This subclass is indented under subclass 100. Subject matter with specialized input in conjunction with
calculation portion.
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132  Having supplemental environment related input:  
This subclass is indented under subclass 131. Subject matter where input unique to a particular art area
can be provided in addition to normal calculator input.
 
133  Cooking:  
This subclass is indented under subclass 132. Subject matter where the supplemental input relates to the
preparation of food for consumption.
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134  Business:  
This subclass is indented under subclass 132. Subject matter where the supplemental input relates to the
conduct of trade.
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135  For security:  
This subclass is indented under subclass 131. Subject matter where a specialized input controls accessing
of the calculating computer.
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136  Input verification: 
This subclass is indented under subclass 131. Subject matter where the specialized input provides a check of intended versus actual input.  
137  Fraction input: 
This subclass is indented under subclass 131. Subject matter where the specialized input permits entry of a fraction.  
138  Flexible input: 
This subclass is indented under subclass 131. Subject matter in which some portion of the input is made nonrigid to facilitate data entry.  
139  Including specific computing system interconnection:  
This subclass is indented under subclass 131. Subject matter for specific structure within the specialized
input serving as an interface between the device actually manipulated
by the operator and computing circuitry.
 
140  Modular or overlay: 
This subclass is indented under subclass 131. Subject matter where plugin modules or overlays are utilized to effect data input.  
141  Including specific nonkeyboardtype information entry: 
This subclass is indented under subclass 131. Subject matter where information ultimately conveyed to the calculating portion is produced by a particular device not having plural individually actuatable keys.  
142  Including specific keyboardtype information entry:  
This subclass is indented under subclass 131. Subject matter where information ultimately conveyed to
the calculating portion is produced by a particular device having
plural individually actuatable keys.
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143  Nonmechanical key actuation:  
This subclass is indented under subclass 142. Subject matter where input keys are operated by other than
a push and release sequence (e.g., magnetic activation).
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144  User definable key:  
This subclass is indented under subclass 142. Subject matter in which the user defines the function associated
with a keyboard key.
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145  Plural function key: 
This subclass is indented under subclass 142. Subject matter where a keyboard key has plurality of selectable predetermined functions associated with it.  
146  Key sequencing (i.e., sequence defines function): 
This subclass is indented under subclass 142. Subject matter where the order in which a plurality of keys is actuated determines the function to be performed.  
160  Having specialized output:  
This subclass is indented under subclass 100. Subject matter with specialized output in conjunction with
calculating portion.
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161  Having supplemental environment related output:  
This subclass is indented under subclass 160. Subject matter where output unique to a particular art area
can be provided in addition to normal calculator output.
 
162  Teaching:  
This subclass is indented under subclass 161. Subject matter where the supplemental output relates to
education.
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163  Business:  
This subclass is indented under subclass 161. Subject matter where the supplemental output relates to
the conduct of trade.
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164  Output verification: 
This subclass is indented under subclass 160. Subject matter in which the output is provided in a form permitting checking thereof (e.g., trace).  
165  Blanking: 
This subclass is indented under subclass 160. Subject matter where the specialized output has provision for suppressing a selected portion of the output.  
166  Zero suppression: 
This subclass is indented under subclass 165. Subject matter wherein the blanking means has zero suppression capability.  
167  Prompting: 
This subclass is indented under subclass 160. Subject matter where the specialized output provides the user with guidance regarding future information entry.  
168  Selective output:  
This subclass is indented under subclass 160. Subject matter where the specialized output permits choosing
the desired output from a plurality of candidates.
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169  Sequential output: 
This subclass is indented under subclass 160. Subject matter where the specialized output provides successive portions of a desired output one at a time.  
170  Using particular format:  
This subclass is indented under subclass 160. Subject matter where the specialized output provides the
output in a specified form.
 
171  Symbol accompanying output: 
This subclass is indented under subclass 160. Subject matter in which the specialized output provides a special symbol with the output representation.  
172  Audio:  
This subclass is indented under subclass 160. Subject matter where the specialized output is in audible
form.
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173  Printer:  
This subclass is indented under subclass 160. Subject matter in which the specialized output provides
the output representation in permanent readable form.
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174  Multiple simultaneous outputs:  
This subclass is indented under subclass 160. Subject matter where a plurality of output representations
are made available by the specialized output at the same time.
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190  Integrated circuit:  
This subclass is indented under subclass 100. Subject matter wherein the calculating is effected by an
integrated circuit or chip, the use or specific structure or arrangement
of which significantly affects or directs the handling of information.
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191  Electrooptical:  
This subclass is indented under subclass 100. Subject matter wherein the calculating is effected by electrooptical
devices.
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192  Bubbledomain:  
This subclass is indented under subclass 100. Subject matter wherein the calculating is effected by bubbledomain
devices.
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200  Particular function performed:  
This subclass is indented under subclass 100. Subject matter having a particular function involving a
calculation performed by digital computer or subcombination thereof.
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201  Absolute value or magnitude:  
This subclass is indented under subclass 200. Subject matter wherein the particular function determines
the absolute value or magnitude of a result from an arithmetic operation.
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202  Median: 
This subclass is indented under subclass 200. Subject matter wherein the particular function provides the middle value in a series.  
203  Compression/decompression:  
This subclass is indented under subclass 200. Subject matter for representing a number or group of numbers
by a smaller number of digits than that possessed originally or
the inverse operation.
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204  Format conversion:  
This subclass is indented under subclass 200. Subject matter for changing a number having a representation
in one form to a representation in another form.
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205  Normalization:  
This subclass is indented under subclass 204. Subject matter in which the number in final form includes
a single nonzero digit to the left of a radix point.
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206  Unit conversion:  
This subclass is indented under subclass 200. Subject matter where a number reflecting a first system
of measurement is changed to reflect a second system of measurement.
 
207  Maximum/minimum determination: 
This subclass is indented under subclass 200. Subject matter in which the largest or smallest of a group of numbers is found.  
208  Scaling: 
This subclass is indented under subclass 200. Subject matter where a number is modified by a predetermined multiplicative factor.  
209  Shifting:  
This subclass is indented under subclass 200. Subject matter where a number is changed by moving each
digit therein simultaneously a specified number of positions in
a specified direction.
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210  Determining number of likevalued bits in word: 
This subclass is indented under subclass 200. Subject matter where the number of 1"s or the number of 0"s in a binary word is determined.  
211  Determining number of likevalued leading or trailing bits: 
This subclass is indented under subclass 200. Subject matter where the number of consecutive leading or trailing 1"s or 0"s in a binary word is determined.  
212  Detecting particular sequence of bits:  
This subclass is indented under subclass 200. Subject matter for locating a particular string of bits
in a larger string of bits.
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230  Multifunctional:  
This subclass is indented under subclass 200. Subject matter wherein the electric digital calculating
computer provides for selectively performing at least one logical
operation as well as at least one arithmetical operation relative
to operands (e.g., a programmable logic circuit with computational
means).
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231  Microprocessor:  
This subclass is indented under subclass 230. Subject matter wherein the multifunctional operation is
performed by a microprocessor.
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232  Array of elements (e.g., AND/OR array, etc.): 
This subclass is indented under subclass 230. Subject matter wherein the multifunctional operation is performed by a group of many similar, basic, complex, or integrated elements without separated enclosures, such as AND/OR arrays, etc.  
233  Pipeline:  
This subclass is indented under subclass 230. Subject matter wherein the multifunctional operation is
performed in a pipeline where the output of one task is input to
another until a desired sequence of tasks has been carried out.
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234  Parallel bit input of operand: 
This subclass is indented under subclass 230. Subject matter wherein the multifunctional operation is performed in bit level and the bits of operands are input in parallel.  
235  Uses lookup table: 
This subclass is indented under subclass 230. Subject matter wherein the operation involves a lookup table to search for a desired item of information.  
236  More than two operands: 
This subclass is indented under subclass 230. Subject matter wherein the operations involve three or more operands.  
250  Random number generation:  
This subclass is indented under subclass 200. Subject matter wherein the computer generates a number or
sequence of numbers characterized by unpredictability so that no
number is any more likely to occur at a given time or place in a
sequence than any other.
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251  Oscillator controlled: 
This subclass is indented under subclass 250. Subject matter wherein the generation is effected by an oscillator or clock.  
252  Linear feedback shift register:  
This subclass is indented under subclass 250. Subject matter wherein the generation is performed by a
feedback shift register in which a proportional relationship exists
between an input and output.
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253  Plural parallel output bits:  
This subclass is indented under subclass 250. Subject matter wherein the generation produces plural bits
of a sequence in parallel.
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254  Seed value controls: 
This subclass is indented under subclass 250. Subject matter wherein seed value is used as an initial value in the generation.  
255  Truly random number: 
This subclass is indented under subclass 250. Subject matter wherein the generation produces a random sequence which is not repeated.  
256  Plural parallel outputs:  
This subclass is indented under subclass 250. Subject matter wherein the generation produces plural sequences
in parallel.
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270  Function generation:  
This subclass is indented under subclass 200. Subject matter wherein a sequence of discrete values is
generated to represent a desired waveform.
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271  Direct digital frequency synthesizer:  
This subclass is indented under subclass 270. Subject matter wherein the generation is performed by a
digital frequency source capable of producing a multitude of output
frequencies from the desired frequency of the waveform.
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272  Memory used to store waveshape:  
This subclass is indented under subclass 270. Subject matter wherein a circuit allows a waveshape to be
stored and retrieved for generating the waveform.
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273  Counter as source (i.e., input): 
This subclass is indented under subclass 270. Subject matter wherein a circuit counts input pulses for producing phase increments as a source.  
274  Linear:  
This subclass is indented under subclass 270. Subject matter where the desired waveform is linear.
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275  Circular: 
This subclass is indented under subclass 270. Subject matter where the desired waveform represents a circular relationship.  
276  Trigonometric: 
This subclass is indented under subclass 270. Subject matter where the desired waveform has trigonometric relationships.  
277  Logarithmic/exponential:  
This subclass is indented under subclass 270. Subject matter where the desired waveform is logarithmic
or exponential.
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290  Interpolation/extrapolation:  
This subclass is indented under subclass 200. Subject matter for the determination or estimation of a
value or values of a function between two known values or of the
trend established between two or more known points.
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300  Filtering:  
This subclass is indented under subclass 200. Subject matter wherein a computational process or algorithm
separates data, signals, or materials in accordance with specified
criteria.
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301  Tapped delay line:  
This subclass is indented under subclass 300. Subject matter wherein a delay line, in which more than
two terminal pairs are associated with a single delay channel, is
used to provide delayed signals.
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303  Microprocessor:  
This subclass is indented under subclass 300. Subject matter wherein the filtering is performed by a microprocessor.
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304  Nonlinear (e.g., median, etc.):  
This subclass is indented under subclass 300. Subject matter wherein the relationship between the pertinent
measures of the input and output signals cannot be adequately described
by linear means (e.g., median filter).
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305  Initialization: 
This subclass is indented under subclass 300. Subject matter where the filter is placed in a beginning state prior to the actual processing.  
306  Finite arithmetic effect:  
This subclass is indented under subclass 300. Subject matter for indication or compensation of an effect
arising from the use of operands having a finite length representation.
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307  Delta/differential coded:  
This subclass is indented under subclass 300. Subject matter in which the samples used in processing are
present in the delta or differential coded format.
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308  Multidimensional data:  
This subclass is indented under subclass 300. Subject matter where the data to be processed is multidimensional
(e.g., image data).
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309  Frequency measurement:  
This subclass is indented under subclass 300. Subject matter where frequency determination is accomplished
by first removing from a signal corrupting noise which was imposed
by a transmission medium.
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310  Coherent: 
This subclass is indented under subclass 300. Subject matter where a particular frequency is eliminated from a signal.  
311  Frequency detection:  
This subclass is indented under subclass 300. Subject matter in which a subset of frequencies from a known
set of possible frequencies is determined to be present.
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312  Tone detection: 
This subclass is indented under subclass 310. Subject matter where the subset consists of a single frequency.  
313  Decimation/interpolation:  
This subclass is indented under subclass 300. Subject matter where the filter deletes from or adds to
the samples input to it in a specified regular fashion resulting
in a net sampling rate change.
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314  Matched filter type:  
This subclass is indented under subclass 300. Subject matter for maximizing the signaltonoise ratio
through the use of filters utilizing correlation techniques.
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315  By convolution:  
This subclass is indented under subclass 300. Subject matter in which a convolution technique is utilized
to accomplish the filtering.
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316  Having multiplexing: 
This subclass is indented under subclass 300. Subject matter where one of a plurality of signals is selected and processed by a given filter or one of a plurality of filters is selected to process a given signal.  
317  Wave:  
This subclass is indented under subclass 300. Subject matter in which the filter has elements representing
distributed parameters.
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318  Lattice:  
This subclass is indented under subclass 300. Subject matter in which the filter has four computational
or delay elements connected in series to form a closed circuit with
two nonadjacent ports serving as the input terminals with the other
two ports serving as output terminals.
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319  Transversal:  
This subclass is indented under subclass 300. Subject matter in which feedforward processing of present
inputs is utilized.
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320  Recursive: 
This subclass is indented under subclass 300. Subject matter in which the present filter output is a function of present inputs and past filter outputs.  
321  Nontime domain:  
This subclass is indented under subclass 300. Subject matter where the data when processed is not in the
time domain.
 
322  Adaptive: 
This subclass is indented under subclass 300. Subject matter where the transfer function of the filter is automatically changed as a function of the input signal.  
323  Equalizer:  
This subclass is indented under subclass 321. Subject matter where adaptive compensation for transmission
medium noise imposition is performed.
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400  Transform:  
This subclass is indented under subclass 200. Subject matter wherein the digital calculation performs
a transformation of a given representation of a data signal to another
representation without loss of information by an orthogonal transformation.
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401  Multidimensional: 
This subclass is indented under subclass 400. Subject matter including a specific apparatus which is used for computing an ndimensional transform of an input signal with n greater or equal to two.  
402  Discrete Cosine Transform (i.e., DCT): 
This subclass is indented under subclass 400. Subject matter wherein the transformation performed is a Discrete Cosine Transform.  
403  Fourier:  
This subclass is indented under subclass 400. Subject matter wherein the transformation performed is a
mathematical operation which decomposes a time varying signal into
its complex frequency components (amplitude and the phase or real
and imaginary components).
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404  Fast Fourier Transform (i.e., FFT):  
This subclass is indented under subclass 403. Subject matter wherein the transformation performed is a
Fast Fourier Transform.
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405  Discrete Fourier Transform (i.e., DFT):  
This subclass is indented under subclass 403. Subject matter wherein the transformation performed is a
Discrete Fourier Transform.
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406  Pipeline:  
This subclass is indented under subclass 403. Subject matter wherein the transformation is performed
in a pipeline where the output of one task is input to another until
a desired sequence of tasks has been carried out.
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407  Systolic:  
This subclass is indented under subclass 403. Subject matter wherein the transformation is performed by
a specific apparatus having an array of computational elements where
data is transferred synchronously between nearest neighbor elements.
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408  Radix greater than two: 
This subclass is indented under subclass 403. Subject matter wherein a specific apparatus is used for computing an nradix Fourier Transform with n greater than two.  
409  Butterfly circuit: 
This subclass is indented under subclass 403. Subject matter wherein a specific apparatus performs a complex multiplication and a complex addition or subtraction.  
410  Walsh:  
This subclass is indented under subclass 400. Subject matter wherein the transformation performed is a
Walsh Transform.
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420  Convolution:  
This subclass is indented under subclass 200. Subject matter which the convolution integral is evaluated
in a digital fashion.
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421  Cyclic/circular: 
This subclass is indented under subclass 420. Subject matter where the convolution integral of a and b, two series of discrete values, is found by performing a transform operation on a and b (producing A and B respectively) and then performing the inverse transform operation on the product of A and B.  
422  Correlation:  
This subclass is indented under subclass 200. Subject matter where the particular function determines
the degree of correspondence between two series of discrete values
by digitally evaluating the correlation integral.
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423  Single bit data: 
This subclass is indented under subclass 422. Subject matter in which the discrete values have a one bit representation.  
424  Multidimensional data:  
This subclass is indented under subclass 422. Subject matter in which at least one series of discrete
values is multidimensional (e.g., image data).
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425  Using tapped delay line:  
This subclass is indented under subclass 422. Subject matter where the outputs from successive stages
of a digital delay element are utilized.
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426  Autocorrelation: 
This subclass is indented under subclass 422. Subject matter in which both series of discrete values are from a single source.  
440  Evaluation of trigonometric function:  
This subclass is indented under subclass 200. Subject matter wherein the particular function performed
is the processing of a signal either to determine a trigonometric
relationship or to operate on a signal in accordance with a trigonometric
relationship.
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441  Vector resolver:  
This subclass is indented under subclass 440. Subject matter wherein the signal is a vector and the operation
is determining the vector components.
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442  Coordinate conversion:  
This subclass is indented under subclass 200. Subject matter wherein the particular function performed
is conversion of coordinates from one coordinate system to another
(e.g., rectangular to polar).
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443  Differentiation:  
This subclass is indented under subclass 200. Subject matter for differentiation of at least one of a
plurality of input signals.
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444  Integration:  
This subclass is indented under subclass 200. Subject matter for the integration of a sequence of discrete
values of an input signal.
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445  Averaging:  
This subclass is indented under subclass 200. Subject matter for determining the average of a sequence
of discrete values.
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446  Solving equation:  
This subclass is indented under subclass 200. Subject matter wherein the specialized function performed
is to solve an equation.
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490  Arithmetical operation: 
This subclass is indented under subclass 200. Subject matter wherein numerical quantities form the elements of the calculation, including the fundamental operations of arithmetic (addition, subtraction, multiplication, comparison, and division).  
491  Residue number:  
This subclass is indented under subclass 490. Subject matter wherein the numerical digits are in the residue
number system.
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492  Galois field: 
This subclass is indented under subclass 490. Subject matter where the arithmetical operations are performed on a 2 m element finite arithmetic field.  
493  Multivalued: 
This subclass is indented under subclass 490. Subject matter where the arithmetical operations are performed with multivalued operands.  
494  Incremental mode:  
This subclass is indented under subclass 490. Subject matter wherein the numerical digits represent a
change in numbers as opposed to whole number representation.
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495  Floating point: 
This subclass is indented under subclass 490. Subject matter wherein the numerical digits are expressed in terms of a bounded number (mantissa) and a scale factor (characteristic or exponent) consisting of a power of the number base.  
496  Compensation for finite word length:  
This subclass is indented under subclass 495. Subject matter wherein the operation results in a word modification
in length due to insufficient representation of using the fixed
word length of the arithmetic system.
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497  Round off or truncation:  
This subclass is indented under subclass 496. Subject matter wherein the modification is a deletion of
one or more of the least significant digits and an adjustment of
the more significant digits in accordance with some specific rule.
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498  Overflow or underflow:  
This subclass is indented under subclass 496. Subject matter wherein the modification is necessary because
the word is either too large or too small to be represented using
the fixed word length.
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499  Sticky bit: 
This subclass is indented under subclass 496. Subject matter wherein the modification is based on whether or not a number of least significant digits contains a one.  
500  Evaluation of root:  
This subclass is indented under subclass 495. Subject matter wherein the operation performed is the determination
of a root.
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501  Multiplication followed by addition:  
This subclass is indented under subclass 495. Subject matter wherein the operation performed is multiplication
followed by an addition.
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502  Reciprocal: 
This subclass is indented under subclass 495. Subject matter wherein the operation performed is the determination of the reciprocal.  
503  Multiplication:  
This subclass is indented under subclass 495. Subject matter wherein the operation performed is multiplication.
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504  Division:  
This subclass is indented under subclass 495. Subject matter wherein the operation performed is division.
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505  Addition or subtraction:  
This subclass is indented under subclass 495. Subject matter wherein the operation performed is addition
or subtraction.
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506  Feedback:  
This subclass is indented under subclass 495. Subject matter wherein the operation is effected by the
return of a portion of the output to its input.
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507  Parallel: 
This subclass is indented under subclass 495. Subject matter wherein the operation is effected by the use of two or more processors running simultaneously.  
508  Pipeline:  
This subclass is indented under subclass 495. Subject matter wherein the operation is effected by passing
the output of one task as input to another until a desired sequence
of tasks has been carried out.
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509  Systolic:  
This subclass is indented under subclass 495. Subject matter wherein the operation is effected by a specific
apparatus using an array of computational elements where data is
transferred synchronously between nearest neighbor elements.
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510  Microprocessor:  
This subclass is indented under subclass 495. Subject matter wherein the operation is effected by a microprocessor.
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511  Complex number format:  
This subclass is indented under subclass 495. Subject matter wherein the numerical digits have a real
part and an imaginary part.
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512  Logarithmic format:  
This subclass is indented under subclass 495. Subject matter wherein the numerical digits which constitute
an operand represented by the exponent to which a base number must
be raised to produce the operand.
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513  Variable length or precision:  
This subclass is indented under subclass 495. Subject matter wherein the numerical digits which constitute
an operand are of selectable length or provide more detail.
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514  Matrix array:  
This subclass is indented under subclass 495. Subject matter wherein the data is operated on by elements
arranged in rows and columns.
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517  Logarithmic format:  
This subclass is indented under subclass 490. Subject matter where an operand is represented by the exponent
to which a base number must be raised to produce the operand.
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518  Variable length:  
This subclass is indented under subclass 490. Subject matter wherein the number of numerical digits that
represent numbers are of differing length.
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519  Negative radix: 
This subclass is indented under subclass 490. Subject matter wherein the numerical digits are represented in negative radix format.  
520  Matrix array:  
This subclass is indented under subclass 490. Subject matter wherein the data is operated on by elements
arranged in rows and columns.
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521  Pipeline:  
This subclass is indented under subclass 490. Subject matter wherein the operation is performed in a pipeline
by passing the output of one task as input to another until a desired sequence
of tasks has been carried out.
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522  Systolic:  
This subclass is indented under subclass 490. Subject matter wherein the operation is effected by a specific
apparatus using an array of computational elements where data is
transferred synchronously between nearest neighbor elements.
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523  Multiplication followed by addition (i.e., x*y+z):  
This subclass is indented under subclass 490. Subject matter wherein the operation performed is a multiplication
followed by an addition.
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524  Multiple parallel operations: 
This subclass is indented under subclass 490. Subject matter including two or more operations in which numerical digits are transmitted simultaneously on separate lines.  
525  Status condition/flag generation or use:  
This subclass is indented under subclass 490. Subject matter where an indicator of the present data processing
status is generated or used to select from a plurality of future
processing paths.
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530  Error detection or correction:  
This subclass is indented under subclass 490. Subject matter with means identifying a malfunction in the
operation of the apparatus or the result produced.
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531  Parity check:  
This subclass is indented under subclass 530. Subject matter wherein the error detection or correction
utilizes a parity bit.
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532  Residue code:  
This subclass is indented under subclass 530. Subject matter wherein the error detection or correction
utilizes a residue code.
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533  Sequential repetition: 
This subclass is indented under subclass 530. Subject matter wherein the error detection or correction utilizes sequential repetition.  
534  Plural parallel devices:  
This subclass is indented under subclass 530. Subject matter wherein the error detection or correction
utilizes plural parallel devices.
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540  Cathoderay tube:  
This subclass is indented under subclass 490. Subject matter wherein the specific apparatus for performing
the arithmetic operation utilizes a cathoderay tube.
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541  Contactmaking device:  
This subclass is indented under subclass 490. Subject matter wherein the specific apparatus for performing
the arithmetic operation utilizes a contactmaking device such as
a relay.
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542  Radix point control:  
This subclass is indented under subclass 490. Subject matter for controlling the radix point position
relative to the numerical digits, e.g., controlling the position
of a decimal point.
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550  Compensation for finite word length:  
This subclass is indented under subclass 490. Subject matter wherein the operation results in a word modification
in length due to insufficient representation of using the fixed
word length of the arithmetic system.
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551  Round off or truncation:  
This subclass is indented under subclass 550. Subject matter wherein the modification is an adjustment
of the more significant digits in accordance with some specific
rule or a deletion of one or more of the least significant digits.
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552  Overflow or underflow:  
This subclass is indented under subclass 550. Subject matter wherein the modification is necessary because
the word is either too large or too small to be represented using
the fixed word length.
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553  Prediction: 
This subclass is indented under subclass 552. Subject matter wherein the overflow or underflow is forecasted before the operation is performed.  
603  Sum of products generation:  
This subclass is indented under subclass 490. Subject matter for producing and adding together a plurality
of operand product terms.
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604  All four basic functions: 
This subclass is indented under subclass 490. Subject matter wherein the computer has the capability of performing the functions of multiplication, division, addition and subtraction.  
605  Evaluation of root:  
This subclass is indented under subclass 490. Subject matter wherein the arithmetic operation performed
is the determination of roots.
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606  Evaluation of powers:  
This subclass is indented under subclass 490. Subject matter wherein the arithmetic operation performed
is the raising of numbers to powers.
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607  Multiplication of matrices:  
This subclass is indented under subclass 490. Subject matter wherein multiplication is performed on plural
sets of data arranged in rows and columns.
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620  Multiplication:  
This subclass is indented under subclass 490. Subject matter wherein the arithmetic operation performed
is multiplication.
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622  Complex number format:  
This subclass is indented under subclass 620. Subject matter wherein the numerical digits have a real
part and an imaginary part.
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623  Decimal:  
This subclass is indented under subclass 620. Subject matter wherein the numerical digits are of radix
ten.
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624  Coded decimal:  
This subclass is indented under subclass 620. Subject matter wherein the numerical digits are of radix
ten expressed in terms of another lesser radix.
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625  Binary:  
This subclass is indented under subclass 620. Subject matter wherein the numerical digits are of radix
two.
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626  Sum of cross products: 
This subclass is indented under subclass 625. Subject matter wherein the multiplication is effected by the sum of cross products technique.  
627  Repeated addition: 
This subclass is indented under subclass 625. Subject matter wherein the multiplication is effected by the repeated addition technique.  
628  Multiple digit: 
This subclass is indented under subclass 627. Subject matter wherein at a given instant of time a plurality of multiplier digits control the repeated addition operation.  
629  Carrysave adders (i.e., CSAs):  
This subclass is indented under subclass 628. Subject matter including an array of carrysave adders to
perform the multiplication.
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630  Array adders: 
This subclass is indented under subclass 628. Subject matter including an array of circuits or integrated circuits that sum the amplitude of two input signals to perform the multiplication.  
631  Pipeline:  
This subclass is indented under subclass 628. Subject matter including a specific apparatus passing the
output of one task as input to another until a desired sequence
of tasks has been carried out.
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632  Feedback:  
This subclass is indented under subclass 628. Subject matter including means which involves feeding back
a partial product as an input to complete the multiplication.
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650  Division:  
This subclass is indented under subclass 490. Subject matter wherein the arithmetic operation performed
is division.
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651  Decimal:  
This subclass is indented under subclass 650. Subject matter wherein the numerical digits are of radix
ten.
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652  Coded decimal:  
This subclass is indented under subclass 650. Subject matter wherein the numerical digits are of radix
ten expressed in terms of another lesser radix.
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653  Binary:  
This subclass is indented under subclass 650. Subject matter wherein the numerical digits are of radix
two.
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654  Multiplication by reciprocal:  
This subclass is indented under subclass 653. Subject matter wherein the division is effected by multiplying
the dividend by the reciprocal of the divisor.
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655  Repeated subtraction: 
This subclass is indented under subclass 653. Subject matter wherein the division is effected by the repeated subtraction technique.  
656  Multiples of divisor: 
This subclass is indented under subclass 655. Subject matter wherein multiples of the divisor are used in the repeated subtraction operation.  
670  Addition/subtraction:  
This subclass is indented under subclass 490. Subject matter wherein the arithmetic operation performed
is addition or subtraction.
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671  Comparison:  
This subclass is indented under subclass 670. Subject matter for comparing by determining the mathematical
magnitude of the difference between two numbers.
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672  Incrementation/decrementation:  
This subclass is indented under subclass 670. Subject matter for incrementation or decrementation which
is performed by changing by one the value of the numerical digit
in the least significant digit position.
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673  Radix correction:  
This subclass is indented under subclass 670. Subject matter for correction for a change in radix.
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674  Serial: 
This subclass is indented under subclass 673. Subject matter wherein the radix correction is performed by operation on the numerical digits in a serial manner.  
675  Signal amplitude: 
This subclass is indented under subclass 670. Subject matter wherein the addition or subtraction is performed by summing signal amplitudes.  
676  Microwave: 
This subclass is indented under subclass 670. Subject matter wherein the addition or subtraction is performed utilizing a microwave device.  
677  Cryogenic:  
This subclass is indented under subclass 670. Subject matter wherein the addition or subtraction is performed
utilizing a cryogenic device.
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678  By electronic tube: 
This subclass is indented under subclass 670. Subject matter wherein the addition or subtraction is performed utilizing an electronic tube.  
679  Magnetic: 
This subclass is indented under subclass 670. Subject matter wherein the addition or subtraction is performed utilizing a magnetic device.  
680  Decimal:  
This subclass is indented under subclass 670. Subject matter wherein the numerical digits are of radix
ten.
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681  Serial: 
This subclass is indented under subclass 680. Subject matter wherein the numerical digits are operated on in a serial manner.  
682  Parallel: 
This subclass is indented under subclass 680. Subject matter wherein the numerical digits are operated on in a parallel manner.  
683  Coded decimal:  
This subclass is indented under subclass 670. Subject matter wherein the numerical digits are of radix
ten expressed in terms of another lesser radix.
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684  Serial: 
This subclass is indented under subclass 683. Subject matter wherein the numerical digits are operated on in a serial manner.  
685  Parallel: 
This subclass is indented under subclass 683. Subject matter wherein the numerical digits are operated on in a parallel manner.  
700  Binary: 
This subclass is indented under subclass 670. Subject matter wherein the numerical digits are of radix two.  
701  Bipolar junction transistor only or combined with FieldEffect Transistor: 
This subclass is indented under subclass 700. Subject matter including a transistor that uses both negative and positive charge carriers or combined with a transistor in which current carriers (holes or electrons) are injected at one terminal (the source) and pass to another (the drain) through a channel of semiconductor material whose resistivity depends mainly on the extent to which it is penetrated by a depletion region.  
702  FieldEffect Transistor (FET): 
This subclass is indented under subclass 700. Subject matter including a transistor in which current carriers (holes or electrons) are injected at one terminal (the source) and pass to another (the drain) through a channel of semiconductor material whose resistivity depends mainly on the extent to which it is penetrated by a depletion region.  
703  Gate function level: 
This subclass is indented under subclass 700. Subject matter including means to show a gate functional level or combined with a transistor.  
704  For precharging (e.g., Manchester, etc.): 
This subclass is indented under subclass 700. Subject matter using clock signal for precharging a fieldeffect transistor.  
705  Serial: 
This subclass is indented under subclass 700. Subject matter wherein the numerical digits are operated on in a serial manner.  
706  Parallel:  
This subclass is indented under subclass 700. Subject matter wherein the numerical digits are operated
upon in a simultaneous manner.
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707  Carryripple:  
This subclass is indented under subclass 706. Subject matter wherein a carry signal ripples through each
digit.
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708  Carrysave adders:  
This subclass is indented under subclass 706. Subject matter including more than one carrysave adder
for performing the addition.
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709  Adding more than two numbers: 
This subclass is indented under subclass 706. Subject matter wherein at least three numbers are added.  
710  Carry lookahead:  
This subclass is indented under subclass 706. Subject matter wherein the addition or subtraction is performed
by a circuit which predicts the final carry from propagate and generate
signals supplied by partial adders.
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711  Slice block having block ripple:  
This subclass is indented under subclass 710. Subject matter wherein carryout signal of a block ripples
through the next block.
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712  Slice block having block lookahead: 
This subclass is indented under subclass 710. Subject matter wherein the carry signals of the blocks lookahead.  
713  Tree structured logic blocks: 
This subclass is indented under subclass 710. Subject matter including more than one logic block containing one or more nodes that are linked together in a hierarchical fashion.  
714  Conditional sums: 
This subclass is indented under subclass 706. Subject matter wherein the addition or subtraction is performed utilizing conditional sums.  
800  ELECTRICAL ANALOG CALCULATING COMPUTER:  
This subclass is indented under the class definition. Subject matter which includes devices for performing calculation
operations upon electrical signals, such as current or voltage, which
are continuously varying representations of physical quantities
and which are some function of the quantities such as direct proportion,
inverse proportion or square law relationship.
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801  Particular function performed:  
This subclass is indented under subclass 800. Subject matter directed to a particular function performed
by an analog computer or subcombination thereof in making a computation.
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802  Evaluation of equation:  
This subclass is indented under subclass 801. Subject matter for obtaining the solution to a mathematical
problem.
 
803  Simultaneous:  
This subclass is indented under subclass 802. Subject matter for the solution of simultaneous equations
or conditions.
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804  Differential (e.g., differential analyzer):  
This subclass is indented under subclass 802. Subject matter wherein the equations evaluated are differential
equations.
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805  Averaging:  
This subclass is indented under subclass 801. Subject matter wherein the function performed is determining
an average amplitude for a signal.
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806  Variance or standard deviation determination:  
This subclass is indented under subclass 801. Subject matter wherein the function performed is determining
variance or standard deviation.
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807  Evaluation of root (e.g., square root):  
This subclass is indented under subclass 801. Subject matter wherein the function performed is root evaluation.
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808  Evaluation of powers:  
This subclass is indented under subclass 801. Subject matter wherein the function performed is the evaluation
of the powers of an input signal.
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809  Coordinate conversion or vector resolver:  
This subclass is indented under subclass 801. Subject matter wherein the computer converts from one coordinate
system to another, such as from rectangular to polar or resolving
a vector into its coordinate values.
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810  Electromechanical: 
This subclass is indented under subclass 809. Subject matter wherein the function is performed utilizing an electromechanical device.  
811  Evaluation of trigonometric function:  
This subclass is indented under subclass 801. Subject matter wherein the function performed is processing
of a signal to either determine a trigonometric relationship or
to operate on a signal in accordance with a trigonometric relationship.
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812  Single triangle: 
This subclass is indented under subclass 811. Subject matter which solves for an unknown parameter of a plane triangle.  
813  Correlation or convolution:  
This subclass is indented under subclass 801. Subject matter for evaluating crosscorrelation, autocorrelation,
crossconvolution or autoconvolution functions.
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814  Of multidimensional data:  
This subclass is indented under subclass 813. Subject matter wherein the correlation or convolution is
of multidimensional data.
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815  Acoustic:  
This subclass is indented under subclass 813. Subject matter utilizing compressional wave propagation
along or through a medium other than a light modulator.
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816  Optical:  
This subclass is indented under subclass 813. Subject matter utilizing optical devices and producing an
electrical output.
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817  Magnetic or electromagnetic: 
This subclass is indented under subclass 813. Subject matter utilizing a magnetic or electromagnetic device.  
818  Having tapped delay line:  
This subclass is indented under subclass 813. Subject matter utilizing a tapped delay line.
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819  Filtering:  
This subclass is indented under subclass 801. Subject matter utilized for filtering electrical signals
by computation.
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820.  Transform:  
This subclass is indented under subclass 801. Subject matter wherein the function performed is transforming
a given representation of a data signal to another representation
without loss of information by an orthogonal transformation.
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821  Fourier:  
This subclass is indented under subclass 820. Subject matter wherein the transformation is from the time
or space domain to the frequency domain or the converse.
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822  Differentiation:  
This subclass is indented under subclass 801. Subject matter wherein the function performed is differentiation
of at least one of a plurality of input signals.
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823  Integrator:  
This subclass is indented under subclass 801. Subject matter wherein the function performed is integration
of at least one of a plurality of input signals.
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824  Plural integration: 
This subclass is indented under subclass 823. Subject matter wherein the function performed is plural integration.  
825  Plural mode (e.g., plural scale): 
This subclass is indented under subclass 823. Subject matter wherein the apparatus is capable of operating in plural modes or scales.  
826  Reset: 
This subclass is indented under subclass 823. Subject matter wherein the integration operation is reset when the output meets a predetermined condition.  
827  Drift correction:  
This subclass is indented under subclass 823. Subject matter additionally including the function of drift
correction.
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828  Having simultaneous calculation of another function: 
This subclass is indented under subclass 823. Subject matter where the input signal on which integration is performed is simultaneously subject to a calculation function other than integration and the output is a function of both.  
829  Having a voltage to frequency converter:  
This subclass is indented under subclass 823. Subject matter utilizing a voltage to frequency converter.
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830  Electromechanical: 
This subclass is indented under subclass 823. Subject matter utilizing an electromechanical device.  
831  Electrooptical: 
This subclass is indented under subclass 823. Subject matter utilizing an electrooptical device.  
832  Magnetic or electromagnetic: 
This subclass is indented under subclass 823. Subject matter utilizing a magnetic or electromagnetic device.  
833  Amplifier with additional feedback loop:  
This subclass is indented under subclass 823. Subject matter utilizing an integrating amplifier with an
additional feedback loop.
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834  Additional R/C feedback loop: 
This subclass is indented under subclass 833. Subject matter including a resistance or capacitance in the additional feedback loop.  
835  Multiplication:  
This subclass is indented under subclass 801. Subject matter wherein the function performed is multiplication.
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836  Time division:  
This subclass is indented under subclass 835. Subject matter wherein one input variable is used to control
the marktospace ratio and the other variable is used to control
the amplitude of a repetitive rectangular wave.
 
837  Quartersquare: 
This subclass is indented under subclass 835. Subject matter wherein the product produced pertains to an analog multiplier whose operation is based upon the identity xy = (1/4) (x+y) 2  (1/4) (xy) 2.  
838  Having charging or discharging of energy storage device:  
This subclass is indented under subclass 835. Subject matter wherein the multiplication function is performed
by charging or discharging of an energy storage device.
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839  Photomultiplier:  
This subclass is indented under subclass 835. Subject matter wherein the multiplication function is performed
utilizing photomultipliers.
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840  Electromagnetic: 
This subclass is indented under subclass 835. Subject matter wherein the multiplication function is performed utilizing an electromagnetic device.  
841  Hall effect:  
This subclass is indented under subclass 840. Subject matter utilizing the Hall effect principle.
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842  Electromechanical (e.g., servomultiplier): 
This subclass is indented under subclass 835. Subject matter wherein the multiplication function is performed utilizing an electromechanical device.  
843  Having alternative division: 
This subclass is indented under subclass 835. Subject matter wherein the function performed is multiplication of two or more inputs and wherein a division is performed as an alternative function.  
844  Division:  
This subclass is indented under subclass 801. Subject matter wherein the function performed is division.
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845  Function generation:  
This subclass is indented under subclass 801. Subject matter wherein the wave shape of at least one analog
signal representing a desired function is generated by mathematical
operation or a signal is generated as a part of a mathematical operation
representing a desired function of at least one variable input parameter.
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846  Piecewise linear synthesis:  
This subclass is indented under subclass 845. Subject matter wherein the desired function is approximated
by a series of segments of straight lines.
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847  Interpolation/extrapolation:  
This subclass is indented under subclass 846. Subject matter including determining or estimating a value
or values between two or more known predetermined points or by continuing the
trend established between two or more known points.
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848  Diode breakpoint:  
This subclass is indented under subclass 846. Subject matter wherein the function is performed by a network
or networks of resistors and diodes in which the diodes begin to
conduct at different values (breakpoints) of an input signal.
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849  Cathoderay tube:  
This subclass is indented under subclass 845. Subject matter wherein sensing a pattern within or external
to the envelope of a cathoderay tube produces a function signal.
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850  Two or more variables: 
This subclass is indented under subclass 845. Subject matter wherein the signal represents two or more variables.  
851  Logarithmic/exponential:  
This subclass is indented under subclass 845. Subject matter wherein the particular generated function
is logarithmic/exponential.
SEE OR SEARCH THIS CLASS, SUBCLASS:
SEE OR SEARCH CLASS:
 
852  Triangular, sawtooth, or ramp:  
This subclass is indented under subclass 845. Subject matter wherein the particular generated function
is of the triangular, sawtooth or ramp type.
SEE OR SEARCH THIS CLASS, SUBCLASS:
SEE OR SEARCH CLASS:
 
853  Hyperbolic: 
This subclass is indented under subclass 845. Subject matter wherein the particular generated function is hyperbolic.  
854  Electromechanical: 
This subclass is indented under subclass 845. Subject matter wherein the function is performed utilizing an electromechanical device.  
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