Granted Patent
Utility
US 4,247,338 · App. 05/962,597
Metal chromate pigment compositions
Inventor:
Bernard G. Ziobrowski
Patented Case
View Patent ↗
Granted: Jan 27, 1981
Filed: Nov 21, 1978
Inventor
Bernard G. Ziobrowski
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.