Granted Patent
Utility
US 4,621,523 · App. 06/746,321
Rapid determination of metal strength from hardness tests
Inventors:
Barrie S. Shabel, Robert F. Young
Patented Case
View Patent ↗
Granted: Nov 11, 1986
Filed: Jun 19, 1985
Inventors
Barrie S. Shabel
Robert F. Young
Assignee (at issue)
Aluminum Company of America
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.