Patents by Inventor William C. Holmgren

William C. Holmgren 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).

  • Engine degreaser composition
    Patent number: 4302365
    Abstract: A foam type engine degreaser composition consisting of an opaque, viscous emulsion having a high water content. A controlled amount of water is added to middle distillate degreasers such as kerosene, naptha, fuel oil and/or heavy naptha so as to form an emulsion which thickens the solvent and causes foaming.
    Type: Grant
    Filed: February 11, 1980
    Date of Patent: November 24, 1981
    Assignee: American Grease Stick Company
    Inventors: William C. Holmgren, Charles E. Hiddema