US PATENT SUBCLASS 338 / 1
COHERER TYPE
Current as of: June, 1999
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DEFINITION
Classification: 338/1
(under the class definition) Subject matter wherein the resistance element has the property of decreasing its resistance value upon the passage of a high frequency current therethrough; or together with structure which enables the resistor to return to its original resistance value upon termination of the high frequency current or to decohere.
(1) Note. Usually the exciting high frequency current is a received high frequency wave, and the coherer is used as a radio detector. The resistance element is usually granular in nature; and the decohering is effected or facilitated as by particular chemical material, or by shock, stirring, agitating, or tapping. Where significant detector circuitry such as a resonant circuit is claimed with coherer, classification is elsewhere.
SEE OR SEARCH THIS CLASS, SUBCLASS:
20+, for resistors whose resistance value is changed by an electric current and/or voltage.
32, for resistors whose resistance value is changed by a magnetic field.
68+, for mechanically variable resistors. SEE OR SEARCH CLASS
257, Active Solid-State Devices (e.g., Transistors, Solid-State Diodes),
43, for active solid-state type coherers.
329, Demodulators,
315+, for frequency demodulators and subclasses 345+ for phase demodulators.
