Granted Patent
Utility
US 4,666,455 · App. 06/823,694
Compositions pigmented with N-substituted 1,4-diketopyrrolo-[3,4-c]-pyrroles
Inventors:
Max Jost, Abul Iqbal, Alain C. Rochat
Patented Case
View Patent ↗
Granted: May 19, 1987
Filed: Jan 29, 1986
Inventors
Max Jost
Abul Iqbal
Alain C. Rochat
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.