Granted Patent
Utility
US 4,900,813 · App. 07/210,537
Fiber-reactive azo dyes having a 4,6-diaminopyridine coupling component
Inventors:
Athanassios Tzikas, Kurt Burdeska
Patented Case
View Patent ↗
Granted: Feb 13, 1990
Filed: Jun 23, 1988
Inventors
Athanassios Tzikas
Kurt Burdeska
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.