Granted Patent
Utility
US 5,374,111 · App. 08/053,114
Extraction undercut for flanged bits
Inventors:
Leroy E. Den Besten, Wayne H. Beach
Patented Case
View Patent ↗
Granted: Dec 20, 1994
Filed: Apr 26, 1993
Inventors
Leroy E. Den Besten
Wayne H. Beach
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.