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Score from: | % to: % | Current assig. owns from to patents |
patent | score | priority | expiry | expired | references | current assignee | title |
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4659642 | 25 | 1984-10-22 | 2004-10-22 | 1 | 36 | Hoechst Celanese Corporation; | Positive working naphthoquinone diazide color proofing transfer process |
4948693 | 39 | 1988-08-29 | 2008-08-29 | 1 | 15 | Hoechst Celanese Corporation; | Positive working color proofing system comprising polyvinyl acetal/polyvinyl alcohol/polyvinyl acetate resin |
4772533 | 45 | 1984-10-22 | 2005-09-20 | 1 | 7 | Hoechst Celanese Corporation; | Positive working naphthoquinone diazide color proofing element with polyvinyl acetate adhesive layer |
4869993 | 51 | 1988-08-29 | 2008-08-29 | 1 | 6 | HOECHST CELANESE CORPORATION, A CORP OF DE; | Optical brightener containing positive working color proofing system |