Granted Patent
Utility
US 4,436,488 · App. 06/267,224
Below motor pressure compensation system for submersible pump
Inventor:
Raymond L. Witten
Patented Case
View Patent ↗
Granted: Mar 13, 1984
Filed: May 26, 1981
Inventor
Raymond L. Witten
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.