Patents by Inventor David J. Cramer

David J. Cramer 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).

  • Latch and cylinder guard
    Patent number: 4237712
    Abstract: A latch and cylinder guard which can be bolted through a door without interfering with the latch and providing a double layer of metal in the latch vicinity.
    Type: Grant
    Filed: October 20, 1978
    Date of Patent: December 9, 1980
    Inventor: David J. Cramer