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Ultrasonically operated water faucet

  • US 4,788,998 A
  • Filed: 01/22/1988
  • Issued: 12/06/1988
  • Est. Priority Date: 03/26/1981
  • Status: Expired due to Fees
First Claim
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1. A method of controlling the flow of fluid from a faucet having a fluid outlet comprising;

  • measuring the distance of an object from the faucet fluid outlet and detecting whether the object is in a position where the fluid will flow onto the object from the fluid outlet;

    causing the fluid to flow when the distance is equal to or less than a first predetermined limit but equal to or greater than a second predetermined limit and the object is in a position where the fluid will flow onto the object from the fluid outlet; and

    preventing the fluid from flowing when the distance is greater than the first predetermined limit or less than the second predetermined limit or the object is not in a position where the fluid will flow onto the object from the fluid outlet.

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