Patents by Inventor J. Patrick O'BRIEN

J. Patrick O'BRIEN 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).

  • CONCENTRIC CYLINDER GAS-OPERATED AUTOMATIC FIREARM
    Publication number: 20150369550
    Abstract: A fixed-barrel, gas-operated firearm having its barrel concentrically mounted within a pressure tube enclosing substantially all of the moving parts of the firearm's action. A gas cup reciprocates under the influence of propellant gas pressure when the firearm is fired, driving slide members that link the pressure cup to the firearm's bolt rearward within the pressure tube, unlocking the breech, rotating and retracting the bolt, discharging the spent cartridge casing and then advancing the bolt to chamber a new cartridge.
    Type: Application
    Filed: January 28, 2015
    Publication date: December 24, 2015
    Inventor: J. Patrick O'Brien
  • CONCENTRIC CYLINDER GAS-OPERATED AUTOMATIC FIREARM
    Publication number: 20150082978
    Abstract: A fixed-barrel, gas-operated firearm having its barrel concentrically mounted within a pressure tube enclosing substantially all of the moving parts of the firearm's action. A gas cup reciprocates under the influence of propellant gas pressure when the firearm is fired, driving slide members that link the pressure cup to the firearm's bolt rearward within the pressure tube, unlocking the breech, rotating and retracting the bolt, discharging the spent cartridge casing and then advancing the bolt to chamber a new cartridge.
    Type: Application
    Filed: May 10, 2014
    Publication date: March 26, 2015
    Inventor: J. Patrick O'Brien
  • Concentric cylinder gas-operated automatic firearm
    Patent number: 8967033
    Abstract: A fixed-barrel, gas-operated firearm having its barrel concentrically mounted within a pressure tube enclosing substantially all of the moving parts of the firearm's action. A gas cup reciprocates under the influence of propellant gas pressure when the firearm is fired, driving slide members that link the pressure cup to the firearm's bolt rearward within the pressure tube, unlocking the breech, rotating and retracting the bolt, discharging the spent cartridge casing and then advancing the bolt to chamber a new cartridge.
    Type: Grant
    Filed: May 10, 2014
    Date of Patent: March 3, 2015
    Inventor: J Patrick O'Brien
  • Concentric cylinder gas-operated automatic firearm
    Patent number: 8752471
    Abstract: A fixed-barrel, gas-operated firearm having its barrel concentrically mounted within a pressure tube enclosing substantially all of the moving parts of the firearm's action. A gas cup reciprocates under the influence of propellant gas pressure when the firearm is fired, driving slide members that link the pressure cup to the firearm's bolt rearward within the pressure tube, unlocking the breech, rotating and retracting the bolt, discharging the spent cartridge casing and then advancing the bolt to chamber a new cartridge.
    Type: Grant
    Filed: June 9, 2011
    Date of Patent: June 17, 2014
    Inventor: J. Patrick O'Brien
  • CONCENTRIC CYLINDER GAS AUTOMATED FIREARM
    Publication number: 20120137871
    Abstract: A fixed-barrel, gas-operated firearm having its barrel concentrically mounted within a pressure tube enclosing substantially all of the moving parts of the firearm's action. A gas cup reciprocates under the influence of propellant gas pressure when the firearm is fired, driving slide members that link the pressure cup to the firearm's bolt rearward within the pressure tube, unlocking the breech, rotating and retracting the bolt, discharging the spent cartridge casing and then advancing the bolt to chamber a new cartridge.
    Type: Application
    Filed: June 9, 2011
    Publication date: June 7, 2012
    Inventor: J. Patrick O'BRIEN