Granted Patent
Utility
US 4,830,107 · App. 07/205,857
Well test tool
Inventor:
William D. Rumbaugh
Patented Case
View Patent ↗
Granted: May 16, 1989
Filed: Jun 13, 1988
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.