Granted Patent
Utility
US 5,396,952 · App. 08/139,415
Drilling rig kelly spinner
Inventor:
Huey Stogner
Patented Case
View Patent ↗
Granted: Mar 14, 1995
Filed: Oct 20, 1993
Inventor
Huey Stogner
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.