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Cleaning system

  • US 4,991,254 A
  • Filed: 05/04/1990
  • Issued: 02/12/1991
  • Est. Priority Date: 12/19/1988
  • Status: Expired due to Term
First Claim
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1. A cleaning system comprising cleaning liquid, a liquid heating system, a spray nozzle for spraying heated liquid onto a surface to be cleaned, a vacuum nozzle for retrieving liquid sprayed by said spray nozzle, a vacuum pump having an inlet and an outlet, means connecting the inlet of said vacuum pump to said vacuum nozzle for withdrawing liquid and air into said vacuum nozzle, and means connected to the outlet of said vacuum pump for conveying air leaving said pump to said liquid heating system to impart heat from said air to said cleaning liquid.

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