Granted Patent
Utility
US 4,764,178 · App. 06/896,000
Thermal transfer printing: hetero-aromatic azo dye
Inventors:
Peter Gregory, Raymond L. White
Patented Case
View Patent ↗
Granted: Aug 16, 1988
Filed: Aug 13, 1986
Inventors
Peter Gregory
Raymond L. White
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.