Granted Patent
Utility
US 5,409,554 · App. 08/122,324
Prevention of particle embrittlement in grain-refined, high-strength steels
Inventor:
Michael J. Leap
Patented Case
View Patent ↗
Granted: Apr 25, 1995
Filed: Sep 15, 1993
Inventor
Michael J. Leap
Assignee (at issue)
THE TIMKEN 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.