Patents Assigned to Royal Harvest, Inc.
  • Additive for engine cooling system
    Patent number: 5100571
    Abstract: The additive of the invention can be used as an additive to a liquid cooling system or as a metal cleaning compound. The additive removes rust and other oxidized materials from the cooling system without having to be flushed from the system. The additive contains about 25 percent ortho phosphoric acid and about 1.5 percent zinc chloride. The additive also contains small amounts of ammonium bifluoride, octylphenoxypolyethyleneoxyethanol, dimethylpolysiloxane, and silicone emulsion. The carrier for the additive is preferably distilled water.
    Type: Grant
    Filed: November 13, 1990
    Date of Patent: March 31, 1992
    Assignee: Royal Harvest, Inc.
    Inventor: Galen W. Hartman