Granted Patent
Utility
US 5,127,623 · App. 07/772,557
Inner seal for ram-type blowout preventer
Inventor:
Garry L. McDugle
Patented Case
View Patent ↗
Granted: Jul 7, 1992
Filed: Oct 7, 1991
Inventor
Garry L. McDugle
Assignee (at issue)
Petro-Flex Rubber Products, 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.