Granted Patent
Utility
US 6,624,271 · App. 10/304,649
Process for making a solution of copolymers of maleic anhydride and alkyl vinyl ether in isopropyl acetate of high specific viscosity and at a high solids level
Inventors:
Yoon Tae Kwak, Stephen L. Kopolow, Alan Carlin
Patented Case
View Patent ↗
Granted: Sep 23, 2003
Filed: Nov 26, 2002
Inventors
Yoon Tae Kwak
Stephen L. Kopolow
Alan Carlin
Assignee (at issue)
ISP INVESTMENTS LLC
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.