Granted Patent
Utility
US 5,058,672 · App. 07/566,064
Landing collar and float valve assembly
Inventor:
Chudleigh B. Cochran
Patented Case
View Patent ↗
Granted: Oct 22, 1991
Filed: Aug 13, 1990
Inventor
Chudleigh B. Cochran
Assignee (at issue)
Lindsey Completion Systems, 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.