Granted Patent
Utility
US 4,809,448 · App. 07/090,883
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Inventors:
Valerio Tonel, Mario Mattiuzzo
Patented Case
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Granted: Mar 7, 1989
Filed: Aug 28, 1987
Inventors
Valerio Tonel
Mario Mattiuzzo
Assignee (at issue)
Nordica S.p.A.
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.