Patents by Inventor Dave A. Adolfson

Dave A. Adolfson 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).

  • Captured spring assembly for a firearm
    Patent number: 8800424
    Abstract: A captured spring assembly for a firearm has a rod having a forward and rearward ends, a movable buffer that defines an aperture that receives the forward end of the rod and is operable to reciprocate between a forward battery position and a rearward retracted position, a coil spring that encompasses the rod, wherein the forward end of the rod has a limit element having a head that is larger in diameter than the rod, wherein the buffer has an internal limit element that is larger in diameter than the rod, and wherein the internal limit element has at least one portion that is smaller in diameter than the limit element head, but also larger in diameter than the rod. There may be a spring stop attached to the rearward end of the rod that is large enough for the spring to bear against and the buffer to strike against.
    Type: Grant
    Filed: June 2, 2012
    Date of Patent: August 12, 2014
    Assignee: J & K IP Assets, LLC
    Inventors: John P. Gangl, Dave A. Adolfson
  • Captured Spring Assembly for a Firearm
    Publication number: 20130319217
    Abstract: A captured spring assembly for a firearm has a rod having a forward and rearward ends, a movable buffer that defines an aperture that receives the forward end of the rod and is operable to reciprocate between a forward battery position and a rearward retracted position, a coil spring that encompasses the rod, wherein the forward end of the rod has a limit element having a head that is larger in diameter than the rod, wherein the buffer has an internal limit element that is larger in diameter than the rod, and wherein the internal limit element has at least one portion that is smaller in diameter than the limit element head, but also larger in diameter than the rod. There may be a spring stop attached to the rearward end of the rod that is large enough for the spring to bear against and the buffer to strike against.
    Type: Application
    Filed: June 2, 2012
    Publication date: December 5, 2013
    Inventors: John P. Gangl, Dave A. Adolfson