Granted Patent
Utility
US 4,824,437 · App. 07/136,444
Thermal transfer printing sheet and process
Inventor:
Peter Gregory
Patented Case
View Patent ↗
Granted: Apr 25, 1989
Filed: Dec 17, 1987
Inventor
Peter Gregory
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.