Granted Patent
Utility
US 3,934,652 · App. 05/514,624
Apparatus and method for cementing well liners
Inventor:
Chudleigh B. Cochran
Patented Case
View Patent ↗
Granted: Jan 27, 1976
Filed: Oct 15, 1974
Inventor
Chudleigh B. Cochran
Assignee (at issue)
Brown Oil Tools, 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.