Granted Patent
Utility
US 4,288,391 · App. 06/093,786
Alkylated 2,2'-biphenylene phosphites
Inventor:
John D. Spivack
Patented Case
View Patent ↗
Granted: Sep 8, 1981
Filed: Nov 13, 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.