Granted Patent
Utility
US 5,607,987 · App. 08/628,433
2-(2-hydroxy-3-.alpha. cumyl-5-tert nonyl or dodecyl phenyl)-2H- Benzotriazole UV Absorbers
Inventors:
Roland A. E. Winter, Ramanathan Ravichandran, Mark S. Holt, Volker H. von Ahn, Joseph E. Babiarz, David G. Leppard
Patented Case
View Patent ↗
Granted: Mar 4, 1997
Filed: Apr 5, 1996
Inventors
Roland A. E. Winter
Ramanathan Ravichandran
Mark S. Holt
Volker H. von Ahn
Joseph E. Babiarz
David G. Leppard
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.