Granted Patent
Utility
US 4,228,276 · App. 06/024,281
Direct precipitation method for producing extrusion-grade cellulose acetate powder and resulting product
Inventors:
Chung-Ming Kuo, Richard T. Bogan
Patented Case
View Patent ↗
Granted: Oct 14, 1980
Filed: Mar 26, 1979
Inventors
Chung-Ming Kuo
Richard T. Bogan
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.