Granted Patent
Utility
US 4,261,889 · App. 05/953,049
Reactive dyestuffs, their manufacture and use
Inventors:
Herbert Seiler, Gert Hegar
Patented Case
View Patent ↗
Granted: Apr 14, 1981
Filed: Oct 19, 1978
Inventors
Herbert Seiler
Gert Hegar
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.