Granted Patent
Utility
US 4,992,517 · App. 07/340,182
Process for production of copolymers of maleic anhydride and an alkyl vinyl ether in a sterically hindered monoether solvent
Inventors:
Mohammed Tazi, Harold J. Harwood
Patented Case
View Patent ↗
Granted: Feb 12, 1991
Filed: Apr 19, 1989
Inventors
Mohammed Tazi
Harold J. Harwood
Assignee (at issue)
GAF Chemicals 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.