Granted Patent
Utility
US 6,089,335 · App. 09/212,551
Positive latch core barrel apparatus
Inventor:
Robert E. Able
Patented Case
View Patent ↗
Granted: Jul 18, 2000
Filed: Dec 16, 1998
Inventor
Robert E. Able
Assignee (at issue)
Boart Longyear International Holdings, 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.