Patents Assigned to TDJ Incorporated
  • Patent number: 9239197
    Abstract: A composite ammunition magazine comprises a box with a follower slidably disposed in the box and a spring disposed between a bottom of the box and the follower and biasing the follower towards an open top. A pair of opposite lips extends from proximal ends at opposite sides of the open top in an arc to distal free ends over the open top of the box. The box and the pair of lips comprise a composite material comprising fibers in a resin matrix with the sides of the box comprising hoop fibers oriented at 0 degrees and axial fibers oriented at 90 degrees, and the pair of lips comprising lateral fibers oriented at 0 degrees and arc fibers extending in an arc and oriented at 90 degrees with respect to the lateral fibers. The pair of lips comprises more arc fibers than the axial fibers in the box.
    Type: Grant
    Filed: July 18, 2014
    Date of Patent: January 19, 2016
    Assignee: TDJ Incorporated
    Inventor: Jason Christensen
  • Patent number: 8196570
    Abstract: According to one embodiment, a bow includes a handle portion and a bowstring. Compression members including primary compression elements and secondary compression elements are positioned on the ends of the handle portion. The compression elements are arcuate in shape and joined at the ends. As the bowstring is drawn, the compression members are compressed and energy is stored therein. The bow can include limbs that do not significantly deform or store energy as the bow is drawn. Upon release of the bowstring, the stored energy is rapidly returned to the bowstring.
    Type: Grant
    Filed: March 9, 2010
    Date of Patent: June 12, 2012
    Assignee: TDJ Incorporated
    Inventors: Ronald J. Christensen, Jason Christensen