Granted Patent
Utility
US 4,224,212 · App. 05/919,831
Dispersing agents, dispersions containing these agents and paints and inks made from the dispersions
Inventor:
Arthur Topham
Patented Case
View Patent ↗
Granted: Sep 23, 1980
Filed: Jun 28, 1978
Inventor
Arthur Topham
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.