Granted Patent
Utility
US 4,696,162 · App. 06/886,348
Multi-function valve
Inventor:
Keith R. Williams
Patented Case
View Patent ↗
Granted: Sep 29, 1987
Filed: Jul 17, 1986
Inventor
Keith R. Williams
Assignee (at issue)
Sundstrand 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.