Granted Patent
Utility
US 4,923,992 · App. 07/329,168
Process for the preparation of bis(2,2,6,6-tetramethyl-4-piperidyl)amine
Inventors:
Graziano Vignali, Giovanni De Roit, Paul Dubs, Peter Baumeister
Patented Case
View Patent ↗
Granted: May 8, 1990
Filed: Mar 27, 1989
Inventors
Graziano Vignali
Giovanni De Roit
Paul Dubs
Peter Baumeister
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.