Granted Patent
Utility
US 4,932,472 · App. 07/343,959
Packoff with flexible section for casing hanger
Inventor:
Carl F. Boehm, Jr.
Patented Case
View Patent ↗
Granted: Jun 12, 1990
Filed: Apr 26, 1989
Inventor
Carl F. Boehm, Jr.
Assignee (at issue)
Vetco Gray, LLC
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.