Granted Patent
Utility
US 5,062,349 · App. 07/495,490
Fluid economizer control valve system for blowout preventers
Inventor:
Farooq A. Khan
Patented Case
View Patent ↗
Granted: Nov 5, 1991
Filed: Mar 19, 1990
Inventor
Farooq A. Khan
Assignee (at issue)
Baroid Technology, 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.