Granted Patent
Utility
US 5,204,595 · App. 07/664,500
Method and apparatus for controlling a walking beam pump
Inventors:
Kenneth E. Opal, William J. Happel
Patented Case
View Patent ↗
Granted: Apr 20, 1993
Filed: Mar 5, 1991
Inventors
Kenneth E. Opal
William J. Happel
Assignee (at issue)
Magnetek, Inc.
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.