Granted Patent
Utility
US 4,581,613 · App. 06/376,792
Submersible pump telemetry system
Inventors:
Donald H. Ward, James R. Tomashek
Patented Case
View Patent ↗
Granted: Apr 8, 1986
Filed: May 10, 1982
Inventors
Donald H. Ward
James R. Tomashek
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.