Granted Patent
Utility
US 5,735,504 · App. 08/719,265
Variable overpressure relief valve
Inventor:
William D. Walters
Patented Case
View Patent ↗
Granted: Apr 7, 1998
Filed: Sep 24, 1996
Inventor
William D. Walters
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.