Granted Patent
Utility
US 5,067,775 · App. 07/184,511
Retainer for rotatable bits
Inventor:
Mark D'Angelo
Patented Case
View Patent ↗
Granted: Nov 26, 1991
Filed: Apr 21, 1988
Inventor
Mark D'Angelo
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.