Granted Patent
Utility
US 5,265,675 · App. 07/857,212
Well conduit cutting and milling apparatus and method
Inventors:
David D. Hearn, Charles M. Hightower, Stephen Ward, Charles D. Hailey
Patented Case
View Patent ↗
Granted: Nov 30, 1993
Filed: Mar 25, 1992
Inventors
David D. Hearn
Charles M. Hightower
Stephen Ward
Charles D. Hailey
Assignees (at issue)
Atlantic Richfield Company
Charles D. Hailey
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.