Granted Patent
Utility
US 4,305,873 · App. 06/076,692
Process for converting a pigment into another modification via liquid alkylamine treatment
Inventor:
Fridolin Babler
Patented Case
View Patent ↗
Granted: Dec 15, 1981
Filed: Sep 18, 1979
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.