Granted Patent
Utility
US 5,213,699 · App. 07/943,382
N-allyl substituted phenylenediamine stabilizers
Inventors:
Joseph E. Babiarz, Thelma Spivack
Patented Case
View Patent ↗
Granted: May 25, 1993
Filed: Sep 10, 1992
Inventors
Joseph E. Babiarz
Thelma 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.