Granted Patent
Utility
US 4,397,218 · App. 06/219,997
Cushion stop for hydraulic cylinder
Inventor:
Donald K. Spring
Patented Case
View Patent ↗
Granted: Aug 9, 1983
Filed: Dec 23, 1980
Inventor
Donald K. Spring
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.