Granted Patent
Utility
US 5,814,691 · App. 08/566,772
Stabilized polyvinyl chloride
Inventors:
Karl-Josef Kuhn, Wolfgang Wehner
Patented Case
View Patent ↗
Granted: Sep 29, 1998
Filed: Dec 4, 1995
Inventors
Karl-Josef Kuhn
Wolfgang Wehner
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.