Patents by Inventor David R. Ridgway

David R. Ridgway 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).

  • Anti-rotation lock apparatus for inside deadbolt locks
    Patent number: 5035128
    Abstract: Anti-rotation lock apparatus prevents the rotation of a deadbolt key or handle by holding the key or handle from the inside of a door. The apparatus includes a base element which fits over the key or lock handle and an extension which extends from the base element and which is braced against the doorknob or doorknob assembly to prevent rotation of the base element and of the key or handle on which the base element is disposed.
    Type: Grant
    Filed: September 20, 1990
    Date of Patent: July 30, 1991
    Inventor: David R. Ridgway