Patents by Inventor Karlis A. Sirons

Karlis A. Sirons 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).

  • Conversion of modern shotguns into muzzleloading shotguns
    Patent number: 4437249
    Abstract: A steel plug is inserted into a modern shotgun to convert it into a muzzleloading firearm. The plug is made for use as a breech plug in a single barrel shotgun without modifications to gun. The plug enables the shotgun to be used as a muzzle-loader with black powder and allows conversion of the gun back to its original condition by simply removing the breech plug.
    Type: Grant
    Filed: March 18, 1982
    Date of Patent: March 20, 1984
    Inventors: James R. Brown, Karlis A. Sirons