Granted Patent
Utility
US 4,340,387 · App. 06/221,468
Process for the dyeing of fibre material
Inventors:
David G. Evans, Jacques Zurbuchen, Willi Leutenegger
Patented Case
View Patent ↗
Granted: Jul 20, 1982
Filed: Dec 30, 1980
Inventors
David G. Evans
Jacques Zurbuchen
Willi Leutenegger
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.