Aqueous solutions or dispersions of self-crosslinking binders, a process for their production and their use
CA 2004513 A1 · Owner: Bayer Aktiengesellschaft · Inventors: Blum, Harald
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Aqueous solutions or dispersions of self-crosslinking binders based on ionically modified polycarboxylic acid polyanhydrides wherein the binders dissolved or dispersed in water have a) a total content of lateral carboxylic acid ester carboxylic, acid thioester or carboxylic acid amide groups of up to 500 milliequivalents per 100 grams solids b) a content of chemically incorporated carboxylate groups of from 10 to 500 milliequivalents per 100 grams solids and, c) a content of ammonium groups of from 10 to 500 milliequivalents per 100 grams solids, are prepared by a process which comprises a first reaction step wherein polyanhydrides A) containing intramolecular carboxylic anhydride groups …
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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 December 4, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 4, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 4, 2011.
- 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.