Granted Patent
Utility
US 4,233,207 · App. 06/055,665
Hydrolytically stable ortho-alkylated phenyl phosphonites and stabilized compositions
Inventor:
John D. Spivack
Patented Case
View Patent ↗
Granted: Nov 11, 1980
Filed: Jul 9, 1979
Inventor
John D. Spivack
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.