Granted Patent
Utility
US 4,355,686 · App. 06/212,994
Well system and method
Inventors:
Henry P. Arendt, Thomas J. Heard
Patented Case
View Patent ↗
Granted: Oct 26, 1982
Filed: Dec 4, 1980
Inventors
Henry P. Arendt
Thomas J. Heard
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.