Granted Patent
Utility
US 5,118,826 · App. 07/666,273
Reactive dyes, their preparation and the use thereof
Inventor:
Rainer Begrich
Patented Case
View Patent ↗
Granted: Jun 2, 1992
Filed: Mar 7, 1991
Inventor
Rainer Begrich
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.