Patents by Inventor John R. Bignall

John R. Bignall 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: 5080196
    Abstract: A pump has a static piston (1) slidably received in a movable cylinder (2). The piston (1) is anchored to a body (4) and the cylinder (2) slides in the body (4). A displacement force applied to an end cap (9) of the cylinder (2) will displace the cylinder in one direction and a return spring (10) returns the cylinder in the opposite direction. A non-return valve assembly (11) enables material to be drawn into and pumped from portion (7) of the cylinder (2). A pin (5), passing through slots (6) in the cylinder (2), secures piston (1) to the body (4).
    Type: Grant
    Filed: October 4, 1990
    Date of Patent: January 14, 1992
    Assignee: Masterlube System Limited
    Inventor: John R. Bignall