Patents by Inventor Bao P. Ma

Bao P. Ma 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).

  • Spiral drum magazine with elongated magazine clip and single piece last round follower
    Patent number: 4926742
    Abstract: The magazine includes a clip magazine (22) above a drum magazine (11) and connectable to an automatic weapon. Door (15) is hinged at its lower edge to open downwardly from clip magazine (22). The torsion spring (21) can be wound by external crank (20), and the spring bias can be relieved by pushing latch plunger (60). The protrusion (102, 103) of the last round follower (85) moves progressively along the spiral path (81) of the drum magazine (11) and the last round follower (85) moves through the turn and into the clip magazine (22) to push the last round of ammunition to the weapon.
    Type: Grant
    Filed: May 24, 1988
    Date of Patent: May 22, 1990
    Assignee: Poly Technologies, Inc.
    Inventors: Bao P. Ma, Zhong Shou-Fu, Qin Z. Li