Granted Patent
Utility
US 5,334,727 · App. 08/004,201
Pyrazole-containing pigment derivatives
Inventor:
Colin D. Campbell
Patented Case
View Patent ↗
Granted: Aug 2, 1994
Filed: Jan 11, 1993
Inventor
Colin D. Campbell
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.