Granted Patent
Utility
US 6,461,111 · App. 09/645,311
Tapered polygon coupling
Inventors:
Ronald L. Haugen, Robert King, Jeff Schmidt
Patented Case
View Patent ↗
Granted: Oct 8, 2002
Filed: Aug 25, 2000
Inventors
Ronald L. Haugen
Robert King
Jeff Schmidt
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.