Granted Patent
Utility
US 4,744,285 · App. 07/024,021
Alternating valve
Inventor:
Glen T. Presley
Patented Case
View Patent ↗
Granted: May 17, 1988
Filed: Mar 10, 1987
Inventor
Glen T. Presley
Assignee (at issue)
Applied Power Inc.
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.