Granted Patent
Utility
US 5,996,709 · App. 09/035,348
Projectile assisted drill for seismic operations
Inventor:
Michael W. Norris
Patented Case
View Patent ↗
Granted: Dec 7, 1999
Filed: Mar 5, 1998
Inventor
Michael W. Norris
Assignee (at issue)
Western Atlas International, 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.