Patents by Inventor Harlan E. Tiefenthal

Harlan E. Tiefenthal 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).

  • Aryl-substituted aliphatic diquaternary compounds
    Patent number: 3936503
    Abstract: Aryl-substituted aliphatic diquaternary ammonium compounds having a long chain alkyl group in which an aryl group is attached to an internal carbon atom and the nitrogen atoms are connected by an alkylene group, useful as cationic bituminous emulsifiers and for fabric treating and textile processing.
    Type: Grant
    Filed: April 9, 1970
    Date of Patent: February 3, 1976
    Assignee: Akzona Incorporated
    Inventors: Eugene J. Miller, Jr., Harlan E. Tiefenthal