Granted Patent
Utility
US 5,044,443 · App. 07/569,073
Method and apparatus for producing wells
Inventors:
Ronald K. Churchman, Roddie R. Smith
Patented Case
View Patent ↗
Granted: Sep 3, 1991
Filed: Aug 17, 1990
Inventors
Ronald K. Churchman
Roddie R. Smith
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.