Granted Patent
Utility
US 4,433,087 · App. 06/267,116
Alkylated 2,2'-biphenylene phosphonates and stabilized compositions
Inventor:
John D. Spivack
Patented Case
View Patent ↗
Granted: Feb 21, 1984
Filed: May 26, 1981
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.