Patents by Inventor Hans D. Grasshoff

Hans D. Grasshoff has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Lubricant composition for refrigerator systems
    Patent number: 5049292
    Abstract: A lubricant for refrigerators which contains phosphate, phosphite and/or silicone additives which impart stability and thermal stability to the lubricant.
    Type: Grant
    Filed: June 23, 1989
    Date of Patent: September 17, 1991
    Assignee: Texaco Technologie Europa GmbH
    Inventors: Hans D. Grasshoff, Vladislav Synek
  • Lubricating greases for high operating temperatures
    Patent number: 4737299
    Abstract: Lubricating greases suitable for use at high operating temperatures which contain a complex thickening system consisting of a lithium soap of a hydroxy fatty acid, an alkali salt of boric acid and a dilithium salt of a branched alkyl chain dicarboxylic acid.
    Type: Grant
    Filed: October 2, 1986
    Date of Patent: April 12, 1988
    Assignee: Texaco Technologie Europa GmbH
    Inventors: Hans D. Grasshoff, Herbert Maak
  • Lubricant for use in non-chip metal forming
    Patent number: 4138348
    Abstract: The present invention is a water soluble, pasty lubricant containing a base material comprising a neutral fat and/or a vegetable oil, an alkali metal soap, water and an alkali metal salt of a boric acid. The lubricant has particular advantage for use in non-chip metal forming.
    Type: Grant
    Filed: June 3, 1974
    Date of Patent: February 6, 1979
    Assignee: Deutsche Texaco Aktiengesellschaft
    Inventor: Hans D. Grasshoff