Granted Patent
Utility
US 4,806,082 · App. 07/118,500
Fluid actuated pump with improved flow-limiting fluid refill valve
Inventor:
Jacob W. Schenk
Patented Case
View Patent ↗
Granted: Feb 21, 1989
Filed: Nov 9, 1987
Inventor
Jacob W. Schenk
Assignee (at issue)
Pennwalt 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.