Granted Patent
Utility
US 4,270,917 · App. 06/081,057
Stabilized aqueous dyestuff dispersions
Inventors:
Terence E. Heald, Roy W. Porter
Patented Case
View Patent ↗
Granted: Jun 2, 1981
Filed: Oct 2, 1979
Inventors
Terence E. Heald
Roy W. Porter
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.