Granted Patent
Utility
US 4,938,639 · App. 07/351,692
Combination tool holder
Inventor:
Thomas A. Lockard
Patented Case
View Patent ↗
Granted: Jul 3, 1990
Filed: May 12, 1989
Inventor
Thomas A. Lockard
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.