Patents by Inventor Gerald Longfoot

Gerald Longfoot 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).

  • Pistons
    Patent number: 4228727
    Abstract: A cast light metal piston has a plurality of longitudinally extending reinforcing members. These reinforcing members may be disposed at predetermined positions in the piston as cast and are designed to impart a compressive stress to the material of the piston in the regions where the reinforcing members are located. Conveniently, the reinforcing members may be located adjacent the opposite sides of each of a pair of gudgeon pin holes provided in the skirt of the piston.
    Type: Grant
    Filed: March 2, 1978
    Date of Patent: October 21, 1980
    Assignee: Wellworthy Limited
    Inventors: David C. Speaight, Gerald Longfoot
  • Sealing ring assemblies for pistons
    Patent number: 4111438
    Abstract: A sealing ring assembly for a piston has an outwardly springing carrier ring and an inwardly springing sealing ring which is located in an outer peripheral recess in the carrier ring. The gaps in the two rings of the assembly are displaced one from the other.
    Type: Grant
    Filed: August 1, 1977
    Date of Patent: September 5, 1978
    Assignee: Wellworthy Limited
    Inventor: Gerald Longfoot