Granted Patent
Utility
US 4,941,997 · App. 07/215,672
Amphiphilic azo dyes and molecular aggregates thereof
Inventors:
Gero Decher, Bernd Tieke
Patented Case
View Patent ↗
Granted: Jul 17, 1990
Filed: Jul 6, 1988
Inventors
Gero Decher
Bernd Tieke
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.