Granted Patent
Utility
US 4,227,396 · App. 06/011,674
Contoured stamping die
Inventor:
John J. Crowe
Patented Case
View Patent ↗
Granted: Oct 14, 1980
Filed: Feb 12, 1979
Inventor
John J. Crowe
Assignee (at issue)
Union Carbide Corporation
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.