Granted Patent
Utility
US 4,908,062 · App. 07/294,655
Water-soluble dye
Inventors:
Brian Balmforth, Nigel Hughes
Patented Case
View Patent ↗
Granted: Mar 13, 1990
Filed: Jan 9, 1989
Inventors
Brian Balmforth
Nigel Hughes
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.