US PATENT CLASS 178
Class Notes
Current as of: June, 1999
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DEFINITION
Classification: 178/
Means for transmitting to a distance messages, unlimited with respect to the extent of information they are adapted to convey, and the transmission and facsimile reproduction of written, printed, or otherwise produced characters, marks, pictures, etc., unlimited with respect to form or outline, by the utilization of conductive or inductive electrical current impulses or reversals, the elements of the messages being selected or composed at will, according to a prearranged code, or the transmitter being actuated or controlled by a previously designed pattern.
(1) Note. Electric signaling means that are limited with respect to the number, character, or subject matter of messages adapted to be conveyed thereby or with respect to the selection of the elements of a message or the possibility of composing the same thereby are deemed to be electric
signals, indicators, and alarms rather than electric telegraphs. Means for the conversion of sound waves into conductive or inductive electrical impulses and reconversion into sound waves for reproduction of sounds at a distance are classified as telephones.
REFERENCES TO OTHER CLASSES
SEE OR SEARCH CLASS
136, Batteries: Thermoelectric and Photoelectric,
243+, for electro-optical cells.
324, Electricity: Measuring and Testing, appropriate subclasses for electrical testing systems not limited to telegraphy.
330, Amplifiers, appropriate subclasses for amplifiers. 333, Wave Transmission Lines and Networks, for electric wave transmission systems wherein electromagnetic wave energy is guided or constrained by a wave propagation medium of appreciable electrical length as compared to the wave length of the propagated energy. This class includes numerous electrical networks and components useful in telegraphy. Note particularly
20, for wave shaping networks of the passive type, subclass 23 for artifical lines, subclasses 24+ for coupling networks, which include equalizers, impedance matching networks, delay networks, and wave filters, subclass 81 for attenuators, subclasses 236+ for longe transmission lines, and subclasses 1+ for plural channel systems of the above which include branched circuits and hybrid type networks.
338, Electrical Resistors,
15+, for photoconductive electrical resistors.
340, Communications: Electrical, for electric systems of communication not peculiar to telegraph code signaling. Note Particularly
825+, for selective systems analogous to the selective systems utilized in telegraphy but restricted to the communication of a limited amount of information or control signals, subclasses 287+ and 533+ for signal box systems such as the American district telegraph or fire alarm systems, and subclass 320 for signaling along a fluid conduit.
341, Coded Data Generation or Conversion,
20+, and 173+ for a pulse code transmitter.
356, Optics: Measuring and Testing, for devices which may involve facsimile systems to test light, or articles or
substances by means of light for optical properties, dimensions, configuration, or flaws, particularly
308+, for spectros:graphic scanning devices, subclasses 380, 386, 387, and 398 for mensuration or configuration devices involving scanning, subclasses 404 and 405 for photos:graphic or tristimulus color tests, and subclass 444 for light transmission tests involving scanning.
359, Optics: Systems (Including Communication) and Elements, 227+, and 238+ for light valves.
361, Electricity: Electrical Systems and Devices,
1+, for electrical safety systems not limited to telegraphy.
370, Multiplex Communications, appropriate subclasses for a multiplexing system, particularly
298+, for multiplexed teletypewriter service.
375, Pluse or Digital Communications, appropriate subclasses for nonteles:graphic pulse or digital communications.
379, Telephonic Communications,
108.01+, for combinations of telegraph and signaling systems with telephone systems or means for sending signals over telephone circuits, subclasses 338+ for telephone type repeaters. Class 171 for amplifiers.
380, Cryptography, appropriate subclasses for cryptos:graphic techniques and equipment.
400, Typewriting Machines, appropriate subclasses for a remote-control typewriter, and see (1) Note in Lines With Other Classes and Within This Class in Class 400 for discussion of the difference between a typewriter of Class 400 and a printing telegraph of Class 178.
455, Telecommunications, appropriate subclasses for nonpulse carrier wave communications.