(under subclass 130) Subject matter wherein the receiver system is provided with means to protect the entire receiver circuit or elements thereof from damage due to outside electrical influences.
(1) Note. The subject matter found in this subclass will include only devices intended to protect the receiver system from damage from outside sources, such as lightning, overload due to an excessive signal and may consist of means placed in the antenna or collector input circuit, or means incorporated in the receiver circuit itself.
SEE OR SEARCH THIS CLASS, SUBCLASS:
117+, for transmitters with circuit protective means.
347+, for mechanical protective means.
SEE OR SEARCH CLASS
330, Amplifiers,
51, for amplifiers combined with automatic disabling switch means. 331, Oscillators,
62, for oscillators with circuit protective means.
343, Communications: Radio Wave Antennas,
6+, for radar systems which are provided with means, usually
a T-R switch for receiver protection; for preventing damage to the receiver due to direct radiation from the transmitter.
361, Electricity: Electrical Systems and Devices,
112, and 113 for safety and protective systems for electrical devices and equipment, for space discharge means and tuned circuit, respectively.
454, Ventilation,
184, for means for ventilating an enclosed space, such as a radio or a television cabinet.
