Granted Patent
Utility
US 5,489,635 · App. 08/434,076
"Crystalline modification of 1, 1', 1""- Nitril0 (tri-2-propyl-tris-[2,2'- ethylidene-bis (4, 6-di-tert-butylphenyl]phosphite)"
Inventors:
Sai P. Shum, Stephen D. Pastor
Patented Case
View Patent ↗
Granted: Feb 6, 1996
Filed: May 3, 1995
Inventors
Sai P. Shum
Stephen D. Pastor
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.