Granted Patent
Utility
US 4,312,434 · App. 06/104,006
Double acting piston for hydraulic clutches
Inventor:
Gerardus M. Ballendux
Patented Case
View Patent ↗
Granted: Jan 26, 1982
Filed: Dec 17, 1979
Inventor
Gerardus M. Ballendux
Assignee (at issue)
Allis-Chalmers 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.