Granted Patent
Utility
US 5,272,192 · App. 07/867,090
Melamine derivatives as stabilizers for chloride-containing polymers
Inventors:
Wolfgang Wehner, Hans-Gunter Kostler
Patented Case
View Patent ↗
Granted: Dec 21, 1993
Filed: Apr 13, 1992
Inventors
Wolfgang Wehner
Hans-Gunter Kostler
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.