Patents by Inventor Johnathan D. Philby

Johnathan D. Philby 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).

  • Method for etching piston rings
    Patent number: 4830719
    Abstract: A method for the etching of chromium-coated piston rings comprises the steps of producing relative movement and rubbing contact between the chromium-coated surface of a piston ring which is anodic and a cathode having a porous material on the rubbing surface thereof, supplying an electrolyte to the porous material between the anodic ring surface and the cathode, establishing an electrical potential therebetween and supplying an electrical current for a period of time during the relative movement.
    Type: Grant
    Filed: June 22, 1988
    Date of Patent: May 16, 1989
    Assignee: AE PLC
    Inventors: David R. Adams, Johnathan D. Philby, Alan D. Pope, David F. Spence, David R. Eastham