Granted Patent
Utility
US 4,508,312 · App. 06/502,313
Ram-type blowout preventer
Inventors:
William M. Taylor, Bolie C. Williams, III
Patented Case
View Patent ↗
Granted: Apr 2, 1985
Filed: Jun 8, 1983
Inventors
William M. Taylor
Bolie C. Williams, III
Assignee (at issue)
Cameron Iron Works, 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.