Granted Patent
Utility
US 5,740,702 · App. 08/681,591
Device for spinning drill pipe in a drill rig
Inventor:
Donald W. Smith
Patented Case
View Patent ↗
Granted: Apr 21, 1998
Filed: Jul 29, 1996
Inventor
Donald W. Smith
Assignee (at issue)
Ingersoll-Rand Company
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.