Granted Patent
Utility
US 4,620,835 · App. 06/616,110
Pump protection system
Inventor:
Gerald Bell
Patented Case
View Patent ↗
Granted: Nov 4, 1986
Filed: Jun 1, 1984
Inventor
Gerald Bell
Assignee (at issue)
American Standard 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.