Granted Patent
Utility
US 4,501,441 · App. 06/363,850
Tension hanger landing bowl
Inventor:
Mark E. Crews
Patented Case
View Patent ↗
Granted: Feb 26, 1985
Filed: Mar 31, 1982
Inventor
Mark E. Crews
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.