Granted Patent
Utility
US 4,678,399 · App. 06/792,618
Resistant components for submersible pump stages
Inventors:
Joseph E. Vandevier, John L. Bearden, William F. Pranger, Harold L. Miller
Patented Case
View Patent ↗
Granted: Jul 7, 1987
Filed: Oct 23, 1985
Inventors
Joseph E. Vandevier
John L. Bearden
William F. Pranger
Harold L. Miller
Assignee (at issue)
Hughes Tool Company LLC
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.