Granted Patent
Utility
US 4,502,502 · App. 06/421,027
Overpressure safety valve
Inventor:
John A. Krug
Patented Case
View Patent ↗
Granted: Mar 5, 1985
Filed: Sep 22, 1982
Inventor
John A. Krug
Assignee (at issue)
C. R. Bard, 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.