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United States Patent

November 13, 2007
View the Complete Patent at the US Patent & Trademark Office
A number of embodiments of a piston may have a shape that provides enhanced piston guidance. In such embodiments, the piston shape may include an axial profile that is configured to provide certain thrust load characteristics.
Donahue; Richard J. (Colgate, WI)
Dresser, Inc. (Addison, TX)
11/ 265,948
November 3, 2005
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH AND DEVELOPMENT The U.S. Government has a paid-up license in this invention and the right in limited circumstances to require the patent owner to license others on reasonable terms as provided for by the terms of DE-FC02-01CH11080 awarded by the Department of Energy.