Granted Patent
Utility
US 6,488,103 · App. 09/754,807
Drilling tool and method of using same
Inventors:
Mahlon D. Dennis, Thomas M. Dennis, Eric M. Twardowski
Patented Case
View Patent ↗
Granted: Dec 3, 2002
Filed: Jan 3, 2001
Inventors
Mahlon D. Dennis
Thomas M. Dennis
Eric M. Twardowski
Assignee (at issue)
Gas Research Institute
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.