Patents by Inventor Dale W. Koop

Dale W. Koop 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 oil control ring therefor
    Patent number: 4585237
    Abstract: A piston having a ring groove therearound has a three part oil control ring in the groove. The ring includes an axially and radially corrugated expander and two flat annular rails retained by the sides of the groove. The radial wall thickness of the rails is no more than 3% of the diameter of the piston; and the radial wall thickness of the expander is no more then 4.7% of the diameter of the piston.
    Type: Grant
    Filed: January 15, 1979
    Date of Patent: April 29, 1986
    Assignee: Hastings Manufacturing Company
    Inventor: Dale W. Koop