IP Library › Granted Patent US 5,279,902
Granted Patent Utility
US 5,279,902 · App. 07/802,025

Air hardening steel

Inventor: James P. Materkowski
Patented Case View Patent ↗
Granted: Jan 18, 1994 Filed: Dec 3, 1991
Inventor
James P. Materkowski
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.

Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 5,279,902
App. No.
07/802,025
Filed
1991-12-03
Granted
1994-01-18
Kind
A