Granted Patent
Utility
US 5,037,449 · App. 07/398,121
Reactive dyes, their preparation and use
Inventors:
Karl Hoegerle, Urs Lehmann
Patented Case
View Patent ↗
Granted: Aug 6, 1991
Filed: Aug 23, 1989
Inventors
Karl Hoegerle
Urs Lehmann
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.