Granted Patent
Utility
US 5,476,949 · App. 08/278,594
Finely divided highly transparent diketopyrrolopyrrole pigments
Inventors:
Olof Wallquist, Gary Wooden, Thomas Eichenberger, Ingo Schloder
Patented Case
View Patent ↗
Granted: Dec 19, 1995
Filed: Jul 21, 1994
Inventors
Olof Wallquist
Gary Wooden
Thomas Eichenberger
Ingo Schloder
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.