Granted Patent
Utility
US 4,410,845 · App. 06/307,558
Backspin detection circuit for a submersible pump
Inventor:
Kevin W. Lockyear
Patented Case
View Patent ↗
Granted: Oct 18, 1983
Filed: Oct 1, 1981
Inventor
Kevin W. Lockyear
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.