Granted Patent
Utility
US 4,669,537 · App. 06/907,988
Well test tool and system
Inventor:
William D. Rumbaugh
Patented Case
View Patent ↗
Granted: Jun 2, 1987
Filed: Sep 16, 1986
Inventor
William D. Rumbaugh
Assignee (at issue)
Otis Engineering Corporation
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.