Granted Patent
Utility
US 6,431,051 · App. 09/540,290
Closed cavity hydraulic piston and method of making the same
Inventors:
Robert J. Stoppek, Mark A. Landwehr, Jay H. Ankeny, Allan Richard Schuster
Patented Case
View Patent ↗
Granted: Aug 13, 2002
Filed: Mar 31, 2000
Inventors
Robert J. Stoppek
Mark A. Landwehr
Jay H. Ankeny
Allan Richard Schuster
Assignee (at issue)
SAUER-DANFOSS INC.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.