Granted Patent
Utility
US 5,492,949 · App. 08/226,620
Stabilized polyvinyl chloride
Inventors:
Rolf Drewes, Markus Kolb, Karl-Josef Kuhn, Wolfgang Wehner
Patented Case
View Patent ↗
Granted: Feb 20, 1996
Filed: Apr 12, 1994
Inventors
Rolf Drewes
Markus Kolb
Karl-Josef Kuhn
Wolfgang Wehner
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.