Granted Patent
Utility
US 5,250,111 · App. 07/863,634
Pigment compositions
Inventors:
Robert Langley, Michael D. McFarland
Patented Case
View Patent ↗
Granted: Oct 5, 1993
Filed: Apr 6, 1992
Inventors
Robert Langley
Michael D. McFarland
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.