Granted Patent
Utility
US 4,887,675 · App. 07/231,632
Earth boring bit with pin mounted compensator
Inventor:
Duane Shotwell
Patented Case
View Patent ↗
Granted: Dec 19, 1989
Filed: Aug 8, 1988
Inventor
Duane Shotwell
Assignee (at issue)
Hughes Tool Company LLC
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.