Granted Patent
Utility
US 6,074,765 · App. 09/089,526
Grinding rod chemistry and method of heat treatment to enhance wearability
Inventor:
Robert W. Pugh, Jr.
Patented Case
View Patent ↗
Granted: Jun 13, 2000
Filed: Jun 3, 1998
Inventor
Robert W. Pugh, Jr.
Assignee (at issue)
Stelco 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.