Granted Patent
Utility
US 4,955,264 · App. 07/358,922
Tool assembly with a hydraulic chip-breaking fluid system
Inventor:
William D. Armbrust
Patented Case
View Patent ↗
Granted: Sep 11, 1990
Filed: May 30, 1989
Inventor
William D. Armbrust
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.