Granted Patent
Utility
US 5,181,564 · App. 07/774,048
Milling tool
Inventors:
John D. Lindley, Colin R. Mackenzie, Mark Hall
Patented Case
View Patent ↗
Granted: Jan 26, 1993
Filed: Oct 8, 1991
Inventors
John D. Lindley
Colin R. Mackenzie
Mark Hall
Assignee (at issue)
Weatherford-Petco, 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.