Patents by Inventor Robert D. Himmer

Robert D. Himmer 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).

  • Automatic door for pets
    Patent number: 4322913
    Abstract: This invention is related to an automatically opening door for pets, mounted in an opening of a building without requiring changes to the opening structure.
    Type: Grant
    Filed: May 8, 1980
    Date of Patent: April 6, 1982
    Inventor: Robert D. Himmer