Granted Patent
Utility
US 4,746,246 · App. 06/311,261
Remotely actuated cutting assembly for broken underwater guidelines
Inventors:
William S. Cowan, Douglas D. Hall
Patented Case
View Patent ↗
Granted: May 24, 1988
Filed: Oct 14, 1981
Inventors
William S. Cowan
Douglas D. Hall
Assignee (at issue)
National Oilwell, 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.