Granted Patent
Utility
US 4,276,932 · App. 06/083,200
Well casing hanger assembly
Inventors:
Kenneth C. Saliger, Martin Jansen
Patented Case
View Patent ↗
Granted: Jul 7, 1981
Filed: Oct 10, 1979
Inventors
Kenneth C. Saliger
Martin Jansen
Assignee (at issue)
NL Industries, 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.