Granted Patent
Utility
US 4,802,332 · App. 07/123,296
Sliding surface lubrication particularly advantageous for a free piston stirling engine
Inventor:
William T. Beale
Patented Case
View Patent ↗
Granted: Feb 7, 1989
Filed: Nov 20, 1987
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.