Patents by Inventor Gregory S. Marcum

Gregory S. Marcum 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).

  • Shotgun gas exchanger
    Patent number: 8112931
    Abstract: A shotgun gas exchanger comprising a gas exchanger tube for connectively engaging with a shotgun barrel and a choke disposed in the gas exchanger having longitudinal axial channels on the exterior surface thereof, such that gas from the shotgun barrel flows through the longitudinal axial channels and gathers in front of the muzzle end of the choke to retard the release of pellets from a wadding cup exiting the muzzle.
    Type: Grant
    Filed: April 14, 2009
    Date of Patent: February 14, 2012
    Inventors: Bill R. Yost, Gregory S. Marcum
  • SHOTGUN GAS EXCHANGER
    Publication number: 20120011757
    Abstract: A shotgun gas exchanger comprising a gas exchanger tube for connectively engaging with a shotgun barrel and a choke disposed in the gas exchanger having longitudinal axial channels on the exterior surface thereof, such that gas from the shotgun barrel flows through the longitudinal axial channels and gathers in front of the muzzle end of the choke to retard the release of pellets from a wadding cup exiting the muzzle.
    Type: Application
    Filed: April 14, 2009
    Publication date: January 19, 2012
    Inventors: Bill R. Yost, Gregory S. Marcum