Granted Patent
Utility
US 4,925,154 · App. 07/395,494
Gate valve with supplemental actuator
Inventor:
Gerald S. Baker
Patented Case
View Patent ↗
Granted: May 15, 1990
Filed: Aug 18, 1989
Inventor
Gerald S. Baker
Assignee (at issue)
Cameron Iron Works USA, 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.