Granted Patent
Utility
US 4,335,352 · App. 06/102,790
Yield strength determination of ferromagnetic materials
Inventor:
David Stephen
Patented Case
View Patent ↗
Granted: Jun 15, 1982
Filed: Dec 12, 1979
Inventor
David Stephen
Assignee (at issue)
Homco International, 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.