Granted Patent
Utility
US 4,577,672 · App. 06/540,778
Device for manufacturing metal strip
Inventors:
Bruno Frischknecht, Rolf Wurgler
Patented Case
View Patent ↗
Granted: Mar 25, 1986
Filed: Oct 11, 1983
Inventors
Bruno Frischknecht
Rolf Wurgler
Assignee (at issue)
Swiss Aluminium Ltd.
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.