Granted Patent
Utility
US 5,902,423 · App. 09/042,484
Heat treatment of grinding rod
Inventor:
Robert W. Pugh, Jr.
Patented Case
View Patent ↗
Granted: May 11, 1999
Filed: Mar 16, 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.