Granted Patent
Utility
US 5,174,321 · App. 07/830,986
Method and apparatus for determining set pressure of pilot operated pressure relief valve
Inventor:
Roger Dale Danzy
Patented Case
View Patent ↗
Granted: Dec 29, 1992
Filed: Feb 4, 1992
Inventor
Roger Dale Danzy
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.