Granted Patent
Utility
US 4,318,333 · App. 06/099,138
Bidirectional, multiple speed hydraulic actuator
Inventor:
Richard A. Cemenska
Patented Case
View Patent ↗
Granted: Mar 9, 1982
Filed: Sep 28, 1979
Inventor
Richard A. Cemenska
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.