Patents by Inventor James J. Forster

James J. Forster 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).

  • Patent number: H167
    Abstract: An improved multipurpose projectile obturator of composite, frangible conuction where the obturator preferably forms part of a projectile that is launched from an upstanding tube. The tube interior is provided with an alternating series of helically arranged groove and land means. A projectile at its propellant end is provided with an annular shoulder that faces in a direction toward the propellant end. An obturator is generally made up of an elastomeric band of a suitable grade of rubber. The band in being placed about the projectile surface and against the shoulder is positively retained as the projectile is inserted in the tube and launched therefrom. The outer periphery of the band has an annular groove for receiving a ring-like element. This element is preferably of three-ply construction and is also preferably made up of two half sections that are suitably bonded to the groove about the band periphery.
    Type: Grant
    Filed: April 18, 1986
    Date of Patent: December 2, 1986
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: James J. Forster, Chester J. Kobialka, Sung Cho