Granted Patent
Utility
US 5,518,539 · App. 08/341,720
Process for the preparation of synergistic pigment mixtures
Inventors:
Zhimin Hao, Abul Igbal, John S. Zambounis, Bernhard Medinger
Patented Case
View Patent ↗
Granted: May 21, 1996
Filed: Nov 18, 1994
Inventors
Zhimin Hao
Abul Igbal
John S. Zambounis
Bernhard Medinger
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.