Patents by Inventor Christophe Geffroy

Christophe Geffroy 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 scraper ring
    Patent number: 4741543
    Abstract: A cylinder and piston assembly with an oil scraper ring having a radially washer seated in a radial piston groove, and a scraping skirt having a radially resilient truncated portion with the base edge engaging the cylinder wall in a scraping line located in or substantially close to the median plane of the washer so as to avoid bending moments on the washer tending to interfere with its free radial movement in the piston groove as required to maintain uniform scraping contact with the cylinder wall.
    Type: Grant
    Filed: January 30, 1987
    Date of Patent: May 3, 1988
    Inventors: Robert Geffroy, Christophe Geffroy
  • Piston and piston rings set
    Patent number: 4516481
    Abstract: New assembly of cylinder, lightweight piston and piston rings for engines and compressors comprising in a cylinder a reduced weight piston provided with a new simpler piston rings set of a high efficiency producing a very small tension against the cylinder and lighter than the piston rings set known heretofore and wherein each of the purposes ascribed to the individual piston rings of the set is entirely attained by each piston ring of this assembly.
    Type: Grant
    Filed: February 1, 1982
    Date of Patent: May 14, 1985
    Inventors: Robert Geffroy, Christophe Geffroy
  • Piston and piston rings set
    Patent number: RE32395
    Abstract: New assembly of cylinder, lightweight piston and piston rings for engines and compressors comprising in a cylinder a reduced weight piston provided with a new simpler piston rings set of a high efficiency producing a very small tension against the cylinder and lighter than the piston rings set known heretofore and wherein each of the purposes ascribed to the individual piston rings of the set is entirely attained by each piston ring of this assembly.
    Type: Grant
    Filed: August 16, 1985
    Date of Patent: April 14, 1987
    Inventors: Robert Geffroy, Christophe Geffroy