Granted Patent
Utility
US 4,329,447 · App. 06/182,521
Catalyst for and method of preparing cellulose esters
Inventors:
Richard J. Brewer, Brice S. Wininger
Patented Case
View Patent ↗
Granted: May 11, 1982
Filed: Aug 29, 1980
Inventors
Richard J. Brewer
Brice S. Wininger
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.