Granted Patent
Utility
US 4,300,902 · App. 06/156,795
Coloration process
Inventor:
Herbert G. Connor
Patented Case
View Patent ↗
Granted: Nov 17, 1981
Filed: Jun 5, 1980
Inventor
Herbert G. Connor
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.