Granted Patent
Utility
US 5,395,926 · App. 08/125,386
Bisazo, bisazomethine and azo-azomethine compounds derived from 1,4-phenylenediamine sulfonic acid salts
Inventors:
Stefan Hari, Olof Wallquist
Patented Case
View Patent ↗
Granted: Mar 7, 1995
Filed: Sep 22, 1993
Inventors
Stefan Hari
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.