Granted Patent
Utility
US 4,421,173 · App. 06/294,436
Motion compensator with improved position indicator
Inventors:
Bruce Beakley, Douglas W. J. Nayler
Patented Case
View Patent ↗
Granted: Dec 20, 1983
Filed: Aug 20, 1981
Inventors
Bruce Beakley
Douglas W. J. Nayler
Assignee (at issue)
NL Industries, 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.