Granted Patent
Utility
US 4,387,774 · App. 06/260,269
Time recorder for in-hole motors
Inventor:
Roger P. Herbert
Patented Case
View Patent ↗
Granted: Jun 14, 1983
Filed: May 4, 1981
Inventor
Roger P. Herbert
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.