Granted Patent
Utility
US 4,888,950 · App. 07/371,278
Magnetic driven hydrodynamic lubrication system for free piston stirling engine
Inventor:
William T. Beale
Patented Case
View Patent ↗
Granted: Dec 26, 1989
Filed: Jun 26, 1989
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.