Granted Patent
Utility
US 4,348,239 · App. 06/174,309
Process for coloring organic material of high molecular weight
Inventor:
Arnold Wick
Patented Case
View Patent ↗
Granted: Sep 7, 1982
Filed: Jul 31, 1980
Inventor
Arnold Wick
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.