Granted Patent
Utility
US 5,165,704 · App. 07/831,926
Blowout preventer bonnet seal carrier
Inventors:
Gary R. Schaeper, Marshall Montgomery
Patented Case
View Patent ↗
Granted: Nov 24, 1992
Filed: Feb 6, 1992
Inventors
Gary R. Schaeper
Marshall Montgomery
Assignee (at issue)
Cooper Industries Holdings
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.