Granted Patent
Utility
US 4,522,840 · App. 06/499,400
Manufacture of highlighted intagliated articles
Inventors:
Brian L. Corfield, Raymond C. Rowe
Patented Case
View Patent ↗
Granted: Jun 11, 1985
Filed: May 31, 1983
Inventors
Brian L. Corfield
Raymond C. Rowe
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.