Granted Patent
Utility
US 4,132,267 · App. 05/893,978
Pipe shearing ram assembly for blowout preventer
Inventor:
Marvin R. Jones
Patented Case
View Patent ↗
Granted: Jan 2, 1979
Filed: Apr 6, 1978
Inventor
Marvin R. Jones
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.