Granted Patent
Utility
US 5,643,985 · App. 08/403,914
Process for the stabilization of and stabilizer mixtures for recycled plastics
Inventors:
Kurt Hoffmann, Heinz Herbst, Rudolf Pfaendner, Hans Sander, Franciszek Sitek
Patented Case
View Patent ↗
Granted: Jul 1, 1997
Filed: Mar 21, 1995
Inventors
Kurt Hoffmann
Heinz Herbst
Rudolf Pfaendner
Hans Sander
Franciszek Sitek
Assignee (at issue)
Ciba-Geigy
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.