Granted Patent
Utility
US 4,973,641 · App. 07/273,394
Polysaccharide graft copolymers containing reactive aminoethyl halide group
Inventors:
John J. Tsai, Eric A. Meier
Patented Case
View Patent ↗
Granted: Nov 27, 1990
Filed: Nov 18, 1988
Inventors
John J. Tsai
Eric A. Meier
Assignee (at issue)
National Starch and Chemical Investment Holding Copporation
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.