Granted Patent
Utility
US 4,407,362 · App. 06/272,363
Flow control apparatus for wells
Inventor:
Howard D. Bechthold
Patented Case
View Patent ↗
Granted: Oct 4, 1983
Filed: Jun 10, 1981
Inventor
Howard D. Bechthold
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.