Patents by Inventor Donald W. Schumm

Donald W. Schumm 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: 4006732
    Abstract: The invention involves providing a device adapted for use in relation to a hole in a layer of ice for maintaining the hole free of ice whereby to facilitate the art of fishing therethrough.
    Type: Grant
    Filed: March 31, 1975
    Date of Patent: February 8, 1977
    Inventor: Donald W. Schumm