Granted Patent
Utility
US 4,393,598 · App. 06/369,400
Borehole tool
Inventors:
Steven Powell, James G. Stockton
Patented Case
View Patent ↗
Granted: Jul 19, 1983
Filed: Apr 19, 1982
Inventors
Steven Powell
James G. Stockton
Assignee (at issue)
NL Sperry-Sun, 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.