Granted Patent
Utility
US 6,210,500 · App. 09/428,951
Method of heat treat hardening thin metal work pieces
Inventor:
Thomas O. Zurfluh
Patented Case
View Patent ↗
Granted: Apr 3, 2001
Filed: Nov 4, 1999
Inventor
Thomas O. Zurfluh
Assignee (at issue)
Federal-Mogul Worldwide, 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.