Granted Patent
Utility
US 5,492,564 · App. 08/216,703
Diketopyrrolopyrrole pigment with high chroma
Inventors:
Gary Wooden, Ingo Schloder, Olof Wallquist
Patented Case
View Patent ↗
Granted: Feb 20, 1996
Filed: Mar 23, 1994
Inventors
Gary Wooden
Ingo Schloder
Olof Wallquist
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.