Granted Patent
Utility
US 4,480,091 · App. 06/547,262
Process for preparing cellulose sulfate esters
Inventor:
Richard J. Brewer
Patented Case
View Patent ↗
Granted: Oct 30, 1984
Filed: Oct 31, 1983
Inventor
Richard J. Brewer
Assignee (at issue)
EASTMAN KODAK COMPANY
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.