Granted Patent
Utility
US 4,724,866 · App. 06/891,748
Speed control valve
Inventors:
Howard J. Bates, Willard D. Childs, Eugene Matsuda, Douglas W. J. Nayler
Patented Case
View Patent ↗
Granted: Feb 16, 1988
Filed: Jul 31, 1986
Inventors
Howard J. Bates
Willard D. Childs
Eugene Matsuda
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.