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PROGRAMMABLE TIMER FOR CONTROLLING THE INJECTION OF ADDITIVES TO A DRY CLEANING SOLVENT CHARGE

  • US 3,721,908 A
  • Filed: 08/25/1971
  • Issued: 03/20/1973
  • Est. Priority Date: 08/25/1971
  • Status: Expired due to Term
First Claim
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1. A chemical processing program control circuit, comprising timer means for applying a signal to a plurality of terminals in a predetermined time sequence, a plurality of bistable means each having first and second stable states, feed control means coupled to each of said bistable meanS for activation when its respective bistable means is in said first stable state and deactivation when its respective bistable means is in said second stable state, means for placing said bistable means in said first stable state, means coupling selected ones of said terminals to selected ones of said bistable means to place each of said bistable means in said second stable state when said signal is applied to said terminal coupled thereto, and means coupling said bistable means to said timer means for activating said timer means while at least one of said bistable means is in said first stable state and for deactivating said timer means when none of said bistable means is in said first stable state.

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