Granted Patent
Utility
US 5,360,559 · App. 08/168,743
Modified ligninsulfonates as dispersing agents for benzoltriazole ultra-violet absorbing agents
Inventor:
Thomas W. Cooke
Patented Case
View Patent ↗
Granted: Nov 1, 1994
Filed: Dec 16, 1993
Inventor
Thomas W. Cooke
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.