Granted Patent
Utility
US 5,151,129 · App. 07/676,402
Process for the production of pigments in the presence of an azo dyestuff
Inventors:
Donald Morrison, David Ross McGregor, James McGeachie McCrae
Patented Case
View Patent ↗
Granted: Sep 29, 1992
Filed: Mar 28, 1991
Inventors
Donald Morrison
David Ross McGregor
James McGeachie McCrae
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.