Patents by Inventor Michael John Marcinkiewicz

Michael John Marcinkiewicz 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).

  • Hand loaded shot shell
    Patent number: 4085677
    Abstract: A shot shell having the characteristic of allowing a leakage of the ignited powder charge to vent around or through the shot charge for achieving preliminary blow off of the nose cap forwardly of the shot charge prior to the propulsion of the shot charge resulting from the main thrust of the expanding gases.
    Type: Grant
    Filed: October 26, 1976
    Date of Patent: April 25, 1978
    Inventor: Michael John Marcinkiewicz