Granted Patent
Utility
US 4,921,966 · App. 07/284,265
Process for the preparation of liquid mixtures of alkylated 2-(2-hydroxyphenyl)benzotriazoles
Inventors:
Werner Stegmann, Reto Luisoli
Patented Case
View Patent ↗
Granted: May 1, 1990
Filed: Dec 14, 1988
Inventors
Werner Stegmann
Reto Luisoli
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.