Patents by Inventor Robert R. Grundstrom

Robert R. Grundstrom 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: 4073165
    Abstract: A locking device comprised of a base plate secured about a keyhole and a cover plate pivotally disclosed thereon including locking means which can be disposed in aligned openings in the plates to selectively lock one to the other to either expose or cover the keyhole.
    Type: Grant
    Filed: August 6, 1976
    Date of Patent: February 14, 1978
    Inventors: Robert R. Grundstrom, Arthur Baylis