Granted Patent
Utility
US 6,525,158 · App. 08/977,110
Process for the stabilization of a stabilizer mixtures for recycled plastic mixtures
Inventors:
Kurt Hoffmann, Heinz Herbst, Rudolf Pfaendner, Hans Sander, Franciszek Sitek
Patented Case
View Patent ↗
Granted: Feb 25, 2003
Filed: Sep 17, 1997
Inventors
Kurt Hoffmann
Heinz Herbst
Rudolf Pfaendner
Hans Sander
Franciszek Sitek
Assignee (at issue)
Ciba Specialty Chemicals 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.