Granted Patent
Utility
US 5,985,964 · App. 08/973,648
Stabilized polyvinyl chloride containing recycled material
Inventors:
Heinz Herbst, Kurt Hoffmann, Rudolf Pfaendner, Rolf Drewes
Patented Case
View Patent ↗
Granted: Nov 16, 1999
Filed: Dec 18, 1997
Inventors
Heinz Herbst
Kurt Hoffmann
Rudolf Pfaendner
Rolf Drewes
Assignee (at issue)
Witco Vinyl Additives GmbH
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.