Thermally sensitive coating compositions containing mixed diazo novolaks useful for lithographic elements
CA 2451613 A1 · Owner: Cusumano, Charles S. · Inventors: Seth, Prakash; Cusumano, Charles S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An infrared imaging composition comprises a mixture of at least two novolak resins esterified with from about 0.1 to 50 mole % of a 2-diazo-1-naphthol-4 or 5-sulfonic acid or derivative thereof wherein the degree of esterification , of one novolak differs from the degree of esterification of the other by at least about 3 mole %, further mixed with an infrared radiation absorbing compound. When applied to a proper support and processed the composition is , useful as an offset lithographics printing plate color proofing film or image , resist.
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed May 29, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 29, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 29, 2024.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.