Granted Patent
Utility
US 5,149,775 · App. 07/647,122
Method for purifying high molecular weight vinylpyridine/styrene polymers from solution
Inventor:
Stephen H. Wu
Patented Case
View Patent ↗
Granted: Sep 22, 1992
Filed: Jan 25, 1991
Inventor
Stephen H. Wu
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.