Granted Patent
Utility
US 5,804,623 · App. 08/756,226
Process for the stabilization of and stablizer mixtures for recycled plastics
Inventors:
Kurt Hoffmann, Heinz Herbst, Rudolf Pfaendner, Hans Sander, Franciszek Sitek
Patented Case
View Patent ↗
Granted: Sep 8, 1998
Filed: Nov 25, 1996
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.