Granted Patent
Utility
US 4,714,403 · App. 06/779,740
Down-hole devices for imparting rotary motion
Inventors:
Michael K. Russell, Colin Arlott
Patented Case
View Patent ↗
Granted: Dec 22, 1987
Filed: Sep 24, 1985
Inventors
Michael K. Russell
Colin Arlott
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.