Inventor
ZHONG YUANZHEN
US11 patents
⚠️ This page may combine multiple inventors who share the name “ZHONG YUANZHEN”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
ISP INVESTMENTS INC
9 patentsUS6667029B2Dec 23, 2003
Stable, aqueous cationic hydrogel
ISP INVESTMENTS INC72 citations94
US5663258ASep 2, 1997
Strongly swellable, moderately crosslinked copolymers of vinylpyrrolidone and vinyl acetate
ISP INVESTMENTS INC22 citations92
US5502136AMar 26, 1996
Process for making substantially homogeneous copolymers of vinyl pyrrolidone and vinyl acetate which form clear aqueous solutions
ISP INVESTMENTS INC29 citations91
US5319041AJun 7, 1994
Process for the preparation of vinylpyrrolidone/vinyl acetate copolymers
ISP INVESTMENTS INC29 citations91
US5395904AMar 7, 1995
Process for providing homogeneous copolymers of vinylpyrrolidone and vinyl acetate which form clear aqueous solutions having a high cloud point
ISP INVESTMENTS INC27 citations90
US5912312AJun 15, 1999
Homogeneous copolymers containing vinyl pyrrolidone and 2-methylene-1,3-dioxepane and process for making same
ISP INVESTMENTS INC8 citations73
US5684105ANov 4, 1997
Process for providing homogeneous copolymers of vinylpyrrolidone and 3-dimethylaminopropyl methacrylamide (DMAPMA) which form clear aqueous solutions having high cloud points
ISP INVESTMENTS INC8 citations73
US5604275AFeb 18, 1997
Color stabilized aqueous n-vinyl heterocyclic copolymer solutions
ISP INVESTMENTS INC8 citations73
US5534564AJul 9, 1996
Process for the color stabilization of an aqueous N-vinyl heterocyclic copolymer solution
ISP INVESTMENTS INC11 citations73