Granted Patent
Utility
US 4,946,948 · App. 07/401,349
Mono and disazo compounds based on b-hydroxy-naphthoic acid derivatives or acetoacetarylide derivatives containing long-chain alkyl ester or alkylamide radicals
Inventors:
Stefan Hari, Fridolin Babler
Patented Case
View Patent ↗
Granted: Aug 7, 1990
Filed: Aug 31, 1989
Inventors
Stefan Hari
Fridolin Babler
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.