Granted Patent
Utility
US 4,670,486 · App. 06/745,034
Polymer composition pigmented with copper or nickel complexes of ligands containing a semicarbazone moiety
Inventors:
Georg Cseh, Paul Lienhard
Patented Case
View Patent ↗
Granted: Jun 2, 1987
Filed: Jun 13, 1985
Inventors
Georg Cseh
Paul Lienhard
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.