Patents by Inventor Leo F. Gehlhoff

Leo F. Gehlhoff 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).

  • Patent number: 3931329
    Abstract: Condensation products of aldehydes and fluoraliphatic phenols are substantive to wool, synthetic polyamides, leather and skin, the compositions preferably being extended with a suitable pharmaceutical medium. The condensation products are useful for the preparation of compositions that render such materials oil and water repellent.
    Type: Grant
    Filed: January 23, 1974
    Date of Patent: January 6, 1976
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Leland S. Endres, Leo F. Gehlhoff, Dallas D. Zimmerman