Patents by Inventor Nicholas Herbert

Nicholas Herbert 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 ring with chrome-filled groove
    Patent number: 4307890
    Abstract: A piston ring having an annular groove in its outer periphery forming axially-spaced outer shoulders at each side of the ring, such groove including a bottom land and a pair of axially-spaced, radially intermediate lands connected to the bottom land and the outer bearing faces by radially outwardly diverging side walls forming stepped sides for the groove with the groove being filled with a layer of electro-deposited chromium. The deposited chromium and the bearing faces form a continuous axially convex surface on the face of the seal ring.
    Type: Grant
    Filed: November 5, 1976
    Date of Patent: December 29, 1981
    Inventors: John E. Cromwell, Nicholas Herbert, Glenn F. Hyde
  • Method of making piston rings with chrome-filled grooves
    Patent number: 4176434
    Abstract: A method of making piston rings comprising forming annular stepped grooves in the outer periphery of a plurality of piston ring blanks, stacking the blanks on a rotatable arbor, electro-depositing a layer of chromium in the grooves and on the outer surfacs of the ring blanks, and removing an outer portion of the chromium layer and the outer bearing faces of the ring blanks to form a plurality of piston rings having a continually axially convex surface on the face of the ring formed by the deposited chromium and bearing faces of the ring.
    Type: Grant
    Filed: May 19, 1978
    Date of Patent: December 4, 1979
    Assignee: Koppers Company, Inc.
    Inventors: John E. Cromwell, Nicholas Herbert, Glenn F. Hyde