Patents by Inventor John Markley Curtis, Jr.

John Markley Curtis, Jr. 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).

  • Double taper piston
    Patent number: 4106463
    Abstract: A piston for an internal combustion engine having a double tapered top land to provide controlled variation in the clearance about the head of the piston. The controlled variation in clearance about the piston head provides a sufficiently sized orifice which prevents the formation of hard carbon and improves oil control without greatly increasing pollutants.
    Type: Grant
    Filed: January 31, 1977
    Date of Patent: August 15, 1978
    Assignee: Koppers Company, Inc.
    Inventors: John Markley Curtis, Jr., Paul Roberts Shepler