Granted Patent
Utility
US 4,599,502 · App. 06/554,460
Induction hardening of steel
Inventors:
Ashok E. Khare, Paul Duliba
Patented Case
View Patent ↗
Granted: Jul 8, 1986
Filed: Nov 22, 1983
Inventors
Ashok E. Khare
Paul Duliba
Assignee (at issue)
National Forge 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.