Granted Patent
Utility
US 4,333,868 · App. 06/104,502
Phosphite ester stabilizers
Inventors:
Andreas Schmidt, Kurt Schwarzenbach
Patented Case
View Patent ↗
Granted: Jun 8, 1982
Filed: Dec 17, 1979
Inventors
Andreas Schmidt
Kurt Schwarzenbach
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.