Inventor

DREFKO WILLIAM J

US2 patents

Patents

2 patents

US6620900B2Sep 16, 2003

Proliferous copolymer of vinyl pyrrolidone and vinyl acetate

ISP INVESTMENTS INC1 citations48

US6806334B2Oct 19, 2004

Proliferous copolymer of vinyl pyrrolidone and vinyl acetate

ISP INVESTMENTS INC1 citations47