Granted Patent
Utility
US 4,487,609 · App. 06/520,655
Powdered, stably dispersible, non-foaming dye formulations and process for their preparation
Inventor:
Roland Putzar
Patented Case
View Patent ↗
Granted: Dec 11, 1984
Filed: Aug 5, 1983
Inventor
Roland Putzar
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.