Granted Patent
Utility
US 4,545,241 · App. 06/392,292
In-hole motor tachometer
Inventor:
Robert L. Alder
Patented Case
View Patent ↗
Granted: Oct 8, 1985
Filed: Jun 25, 1982
Inventor
Robert L. Alder
Assignee (at issue)
SMITH INTERNATIONAL, 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.