Granted Patent
Utility
US 4,421,717 · App. 06/405,136
Method of making wear resistant ferrous based parts
Inventor:
Vemulapalli D. N. Rao
Patented Case
View Patent ↗
Granted: Dec 20, 1983
Filed: Jun 10, 1982
Inventor
Vemulapalli D. N. Rao
Assignee (at issue)
Ford Motor Company
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.