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Power outage timer

  • US 4,466,074 A
  • Filed: 09/18/1981
  • Issued: 08/14/1984
  • Est. Priority Date: 09/18/1981
  • Status: Expired due to Fees
First Claim
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1. In an electronic watt-hour meter operated by a microprocessor and having connected thereto a real time value electrically alterable read only memory and a real time clock signal input, the improvement comprising:

  • a power outage/loss of voltage timing means, coupled to the microprocessor, for generating a signal after power is restored to said microprocessor following a power outage, such signal being indicative of the time duration of the power outage when the watt-hour meter was inoperative and being input to the microprocessor so that the microprocessor updates the real time value in the electrically alterable read only memory to reflect the correct real time in the memory.

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