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Control circuits for vehicle rear window heaters

  • US 3,973,140 A
  • Filed: 01/27/1975
  • Issued: 08/03/1976
  • Est. Priority Date: 01/29/1974
  • Status: Expired due to Term
First Claim
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1. A control circuit for a vehicle rear window heater comprising, in combination:

  • a bistable circuit having first and second states, having means for connection to a supply, and being biased so as to occupy a first state when connected to the supply by said means, switch means operably connected to said bistable circuit and occupying first and second positions when said bistable circuit is in its first and second states, respectively, an output terminal operatively connected to said switch means and for connection to the heater, said switch means providing power to said output terminal when moved to its second position, a normally open switch connected to said bistable circuit for changing the state of the bistable circuit each time it is operated, and a monostable circuit coupled to said switch means so as to be held in its unstable state when said switch means is in its first position, said monostable circuit being coupled to said bistable circuit, so as to switch said bistable circuit to its first state upon reversion of the monostable circuit to its stable state.

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