Granted Patent
Utility
US 4,523,639 · App. 06/553,529
Ram type blowout preventers
Inventor:
Roland M. Howard, Jr.
Patented Case
View Patent ↗
Granted: Jun 18, 1985
Filed: Nov 21, 1983
Inventor
Roland M. Howard, Jr.
Assignee (at issue)
Koomey Blowout Preventers, 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.