Granted Patent
Utility
US 4,512,773 · App. 06/493,262
Cationic triphendioxazine dyes, methods for their manufacture and their use for dyeing cellulosic substrates
Inventors:
Kenneth Anderton, Nigel Hall, Brian Parton, Andrew H. M. Renfrew, Malcolm G. Shaw
Patented Case
View Patent ↗
Granted: Apr 23, 1985
Filed: May 10, 1983
Inventors
Kenneth Anderton
Nigel Hall
Brian Parton
Andrew H. M. Renfrew
Malcolm G. Shaw
Assignee (at issue)
IMPERIAL CHEMICAL INDUSTRIES LIMITED
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.