Granted Patent
Utility
US 4,318,675 · App. 06/120,431
Rotary expansible chamber apparatus with stress relief
Inventors:
John M. Clarke, Alan W. Wells
Patented Case
View Patent ↗
Granted: Mar 9, 1982
Filed: Dec 14, 1979
Inventors
John M. Clarke
Alan W. Wells
Assignee (at issue)
Caterpillar Tractor Co.
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.