Granted Patent
Utility
US 4,364,571 · App. 06/195,461
Tapered seal seat between stationary insert and gland
Inventor:
Lowell E. Hershey
Patented Case
View Patent ↗
Granted: Dec 21, 1982
Filed: Oct 9, 1980
Inventor
Lowell E. Hershey
Assignee (at issue)
Durametallic 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.