Granted Patent
Utility
US 5,172,775 · App. 07/665,400
Rotary drill bit insert
Inventors:
Daniel C. Sheirer, Gerald L. Woods, Robert H. Montgomery, Jr.
Patented Case
View Patent ↗
Granted: Dec 22, 1992
Filed: Mar 6, 1991
Inventors
Daniel C. Sheirer
Gerald L. Woods
Robert H. Montgomery, Jr.
Assignee (at issue)
KENNAMETAL INC.
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.