Granted Patent
Utility
US 5,267,620 · App. 07/865,355
Drilling latch apparatus
Inventor:
Kevin J. Lee
Patented Case
View Patent ↗
Granted: Dec 7, 1993
Filed: Apr 8, 1992
Inventor
Kevin J. Lee
Assignee (at issue)
Longyear™, 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.