Granted Patent
Utility
US 4,363,465 · App. 05/697,084
Extreme temperature, high pressure balanced, rising stem gate valve with super preloaded, stacked, solid lubricated, metal-to-metal seal
Inventor:
Charles D. Morrill
Patented Case
View Patent ↗
Granted: Dec 14, 1982
Filed: Jun 16, 1976
Inventor
Charles D. Morrill
Assignee (at issue)
SMITH INTERNATIONAL, 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.