Granted Patent
Utility
US 4,977,015 · App. 07/454,910
Films and tapes
Inventors:
Colin A. Dewar, Kevin J. Artus
Patented Case
View Patent ↗
Granted: Dec 11, 1990
Filed: Dec 22, 1989
Inventors
Colin A. Dewar
Kevin J. Artus
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.