Granted Patent
Utility
US 4,404,802 · App. 06/302,102
Center-porting and bearing system for free-piston stirling engines
Inventor:
William T. Beale
Patented Case
View Patent ↗
Granted: Sep 20, 1983
Filed: Sep 14, 1981
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.