Patents by Inventor Joseph P. Knopp

Joseph P. Knopp 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).

  • Safety device for firearms
    Patent number: 4023294
    Abstract: For insertion in a firearm to prevent discharge thereof, a plastic rod having longitudinal ribs fits in the barrel and extends into one of the cylinder chambers of the weapon. The outer end of the rod is recessed from the muzzle end of the barrel and is tapped and threaded. A key threads into the rod and may be pulled outwardly to remove the rod from the gun barrel.
    Type: Grant
    Filed: July 19, 1976
    Date of Patent: May 17, 1977
    Inventor: Joseph P. Knopp