Granted Patent
Utility
US 4,293,115 · App. 06/078,092
Testing mechanism for blowout preventer ram lock
Inventors:
Glenn C. Parks, Jr., Clark W. Beam
Patented Case
View Patent ↗
Granted: Oct 6, 1981
Filed: Sep 24, 1979
Inventors
Glenn C. Parks, Jr.
Clark W. Beam
Assignee (at issue)
Hydril Company
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.