Patents by Inventor Christophe Geoffroy

Christophe Geoffroy 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).

  • Piston and multilayer piston ring set
    Patent number: 4986168
    Abstract: Compression piston ring for internal combustion or compressor cylinder and piston comprising double layer of segmented ring sectors having free form circumferential curvature matching the cylinder bore. The double layers are adapted to effectively seal or minimize bypass with resilient means provided for maintaining ring cylinder engagement under light radial pressure.
    Type: Grant
    Filed: January 3, 1989
    Date of Patent: January 22, 1991
    Inventors: Robert Geffroy, Christophe Geoffroy, Lloyd M. Forster