Granted Patent
Utility
US 6,197,908 · App. 09/263,450
High molecular weight, homogeneous, branched copolymers of maleic anhydride and alkyl vinyl ether monomers
Inventor:
Herbert Ulmer
Patented Case
View Patent ↗
Granted: Mar 6, 2001
Filed: Mar 5, 1999
Inventor
Herbert Ulmer
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.