Granted Patent
Utility
US 6,214,956 · App. 09/268,834
Solvent-free copolymers of maleic anhydride and alkyl vinyl ethers having a specific viscosity of 0.5 to 5 and method of making
Inventor:
Krystyna Plochocka
Patented Case
View Patent ↗
Granted: Apr 10, 2001
Filed: Mar 16, 1999
Inventor
Krystyna Plochocka
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.