US PATENT SUBCLASS 307 / 653
.~ Flame responsive (e.g., flame acts as a rectifier in circuit)

Current as of: June, 1999
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307 /   HD   ELECTRICAL TRANSMISSION OR INTERCONNECTION SYSTEMS

650  DF  WITH NONSWITCHING MEANS RESPONSIVE TO EXTERNAL NONELECTRICAL CONDITION {3}
653.~ Flame responsive (e.g., flame acts as a rectifier in circuit)

DEFINITION

Classification: 307/653

Flame responsive (e.g., flame acts as a rectifier in circuit):

(under subclass 650) Subject matter wherein a control or detecting means is constituted by a flame that completes an electric circuit.

SEE OR SEARCH THIS CLASS, SUBCLASS:

117, for a condition responsive switching system which may be responsive to heat or a flame.

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250, Radiant Energy,

554, for prephotocell systems with a flame light source.

313, Electric Lamp and Discharge Devices, 53, for discharge device structure wherein a flame provides an ionized path for the discharge.

327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,

512+, and 514+ flame responsive external effects.

340, Communications: Electrical,

577+, and 600 for flame and radiant energy responsive signal systems respectively.