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Garage door openers

  • US 4,954,810 A
  • Filed: 01/22/1990
  • Issued: 09/04/1990
  • Est. Priority Date: 01/22/1990
  • Status: Expired due to Fees
First Claim
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1. In an automated door operating system characterized by a source of motive power connected to operate said door, a control system for controlling said source of motive power and a remote sending unit conformed to issue signals to said control system for directing the operation of said door, the improvement comprising:

  • a radio frequency transmitter deployed adjacent said door and rendered operative to produce a first radio signal upon the opening of said door; and

    a first radio frequency receiver attached to said sending unit and including a clock rendered operative in response to the receipt of said first radio signal, an audio signal source concurrently actuated with said clock, and signaling means concurrently actuated with said sending unit for terminating the operation of said clock upon the actuation thereof.

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