Granted Patent
Utility
US 5,046,524 · App. 07/556,773
Safety relief valve
Inventor:
Richard H. Crichton, Jr.
Patented Case
View Patent ↗
Granted: Sep 10, 1991
Filed: Jul 23, 1990
Inventor
Richard H. Crichton, Jr.
Assignee (at issue)
Dresser Industries, 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.