Granted Patent
Utility
US 5,380,828 · App. 08/224,616
Azodicarboxylic acid derivatives containing hindered amine moieties as polymer stabilizers
Inventors:
Ramanathan Ravichandran, Ambelal R. Patel
Patented Case
View Patent ↗
Granted: Jan 10, 1995
Filed: Apr 7, 1994
Inventors
Ramanathan Ravichandran
Ambelal R. Patel
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.