Granted Patent
Utility
US 4,997,937 · App. 07/422,339
Fiber-reactive dioxazine dyes containing two vinylsulfonyl moieties
Inventors:
Athanassios Tzikas, Peter Aeschlimann
Patented Case
View Patent ↗
Granted: Mar 5, 1991
Filed: Oct 16, 1989
Inventors
Athanassios Tzikas
Peter Aeschlimann
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.