found 4 in 633ms
patent
score
priority
expiry  
expired
references
current assignee
title
4659642251984-10-222004-10-22136Hoechst Celanese Corporation;  Positive working naphthoquinone diazide color proofing transfer process
4948693391988-08-292008-08-29115Hoechst Celanese Corporation;  Positive working color proofing system comprising polyvinyl acetal/polyvinyl alcohol/polyvinyl acetate resin
4772533451984-10-222005-09-2017Hoechst Celanese Corporation;  Positive working naphthoquinone diazide color proofing element with polyvinyl acetate adhesive layer
4869993511988-08-292008-08-2916HOECHST CELANESE CORPORATION, A CORP OF DE;  Optical brightener containing positive working color proofing system