Granted Patent
Utility
US 4,254,796 · App. 06/086,166
Gas regulator valve with step opening characteristic
Inventor:
Samuel T. Kelly
Patented Case
View Patent ↗
Granted: Mar 10, 1981
Filed: Oct 18, 1979
Inventor
Samuel T. Kelly
Assignee (at issue)
ROBERTSHAW CONTROLS PRIVATE LIMITED
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.