Granted Patent
Utility
US 4,415,685 · App. 06/358,734
Process for dyeing high-molecular organic material, and novel polycyclic pigments
Inventors:
Abul Iqbal, Luigi Cassar
Patented Case
View Patent ↗
Granted: Nov 15, 1983
Filed: Mar 16, 1982
Inventors
Abul Iqbal
Luigi Cassar
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.