Granted Patent
Utility
US 5,641,351 · App. 08/422,299
Pigment compositions based on 3,6-di(biphenyl)1,4-diketo-pyrrolo[3,4c]-pyrrole
Inventor:
Fridolin Babler
Patented Case
View Patent ↗
Granted: Jun 24, 1997
Filed: Apr 14, 1995
Inventor
Fridolin Babler
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.