Granted Patent
Utility
US 4,976,403 · App. 07/465,492
Valve with metallic bellows valve stem seal
Inventor:
John W. Bramblet
Patented Case
View Patent ↗
Granted: Dec 11, 1990
Filed: Jan 16, 1990
Inventor
John W. Bramblet
Assignee (at issue)
Rockford Controls Corporation
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.