Phthalic acid derivatives which are substituted by 2- propynyloxy groups, processes for their preparation and their use
CA 1236465 A · Owner: Ciba-Geigy Investments Ltd. · Inventors: Monnier, Charles E.; Kvita, Vratislav; Darms, Roland
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Phthalic acid derivatives which are substituted by 2-propynyloxy groups, processes for their preparation and their use, Abstract, Novel phthalic acid derivatives which are substituted by 2-propynyloxy groups, of the formula I (I), in which Q1, Q2, R1 and n are as defined in patent claim 1 (for example Q1 and Q2 together are -O- or -N(R2)-) are described. The phthalic anhydrides which are substituted by 2-propynyloxy, of the formula I, can be used for curing epoxy resins, cured products with outstanding physical properties being obtained.
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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
- Granted May 10, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 10, 2005.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.