Granted Patent
Utility
US 4,304,851 · App. 06/192,937
Polyester sublime layers for photographic layers with polyester bases
Inventors:
Patrick Terence McGrail, David R. Mann
Patented Case
View Patent ↗
Granted: Dec 8, 1981
Filed: Oct 1, 1980
Inventors
Patrick Terence McGrail
David R. Mann
Assignee (at issue)
Bexford 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.