Granted Patent
Utility
US 4,645,887 · App. 06/803,299
Pressure differential bypass sensor switch
Inventor:
James C. Whiting
Patented Case
View Patent ↗
Granted: Feb 24, 1987
Filed: Dec 2, 1985
Inventor
James C. Whiting
Assignee (at issue)
Facet Enterprises, Incorporated
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.