Granted Patent
Utility
US 4,330,993 · App. 06/097,409
Hydrodynamic lubrication system for piston devices particularly Stirling engines
Inventor:
William T. Beale
Patented Case
View Patent ↗
Granted: May 25, 1982
Filed: Nov 26, 1979
Inventor
William T. Beale
Assignee (at issue)
SUNPOWER CORPORATION
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.