Granted Patent
Utility
US 5,753,774 · App. 08/768,661
Functional group terminated polymers containing sulfonate group via sulfonation of ethylenically unsaturated polymers
Inventor:
Wally Liyuan Chang
Patented Case
View Patent ↗
Granted: May 19, 1998
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.