Patents by Inventor Jeremy Holt

Jeremy Holt 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 piston ring assemblies
    Patent number: 4669369
    Abstract: A two ring piston and piston ring assembly has an upper thin steel compression ring and a lower ring which is thicker than the compression ring and which acts both as a compression ring and an oil control ring. The lower piston ring is made of a material which is more conformable than steel, for example a plastics material, which may be reinforced. In this way, effective sealing is provided using only two piston rings, while the frictional forces between the piston and an associated cylinder are reduced.
    Type: Grant
    Filed: January 14, 1985
    Date of Patent: June 2, 1987
    Assignee: AE Plc
    Inventors: Jeremy Holt, David A. Parker, Brian L. Ruddy