Granted Patent
Utility
US 5,202,441 · App. 07/606,403
Polymer stabilizers containing both hindered amine and hydroxylamine moieties
Inventors:
Joseph Suhadolnik, Ramanathan Ravichandran, Valerio Borzatta, Graziano Vignali
Patented Case
View Patent ↗
Granted: Apr 13, 1993
Filed: Oct 31, 1990
Inventors
Joseph Suhadolnik
Ramanathan Ravichandran
Valerio Borzatta
Graziano Vignali
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.