Granted Patent
Utility
US 6,166,165 · App. 08/768,660
Polyurethane synthesis from functional group terminated polymers containing sulfonate groups
Inventor:
Wally Liyuan Chang
Patented Case
View Patent ↗
Granted: Dec 26, 2000
Filed: Dec 18, 1996
Inventor
Wally Liyuan Chang
Assignee (at issue)
Witco Corporation
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.