Granted Patent
Utility
US 6,451,944 · App. 09/861,044
Continuous, solvent-free process for making copolymers of maleic anhydride and C1−4 alkyl vinyl ether
Inventors:
Russell B. Biss, Jeffrey M. Cohen, John Zamora, Krystyna Plochocka, Jeffrey Lynn
Patented Case
View Patent ↗
Granted: Sep 17, 2002
Filed: May 18, 2001
Inventors
Russell B. Biss
Jeffrey M. Cohen
John Zamora
Krystyna Plochocka
Jeffrey Lynn
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.