Granted Patent
Utility
US 5,621,136 · App. 08/542,579
Colorless, non-toxic, stabilized aqueous solution of a C1-C5 alkyl vinyl ether and maleic acid copolymer
Inventors:
Chi-San Wu, James F. Curry, James P. Cullen, John S. McEwan
Patented Case
View Patent ↗
Granted: Apr 15, 1997
Filed: Oct 13, 1995
Inventors
Chi-San Wu
James F. Curry
James P. Cullen
John S. McEwan
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.