Granted Patent
Utility
US 6,640,731 · App. 10/179,629
Dual tungsten carbide boot
Inventors:
Don C. Rowlett, Gerry S. Swab, James W. Henry, Dave Wiebe
Patented Case
View Patent ↗
Granted: Nov 4, 2003
Filed: Jun 25, 2002
Inventors
Don C. Rowlett
Gerry S. Swab
James W. Henry
Dave Wiebe
Assignees (at issue)
KENNAMETAL INC.
Flexi-Coil Ltd.
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.