Patents by Inventor Karl H. Knopf

Karl H. Knopf 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).

  • Beer tap
    Patent number: D273453
    Type: Grant
    Filed: October 13, 1981
    Date of Patent: April 17, 1984
    Inventor: Karl H. Knopf