Granted Patent
Utility
US 4,190,114 · App. 05/934,687
Subsea wellhead apparatus
Inventors:
Edmund A. Fisher, Frank P. Czerewaty
Patented Case
View Patent ↗
Granted: Feb 26, 1980
Filed: Aug 18, 1978
Inventors
Edmund A. Fisher
Frank P. Czerewaty
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.