Epoxide adducts and their salts as dispersants
CA 2469989 C · Owner: Byk-Chemie Gmbh · Inventors: Matthee, Peter; Pentzek, Andrea; Haubennestel, Karlheinz
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to addition compounds suitable for use as wetting agents and dispersants and obtainable by reacting monofunctional or polyfunctional aromatic epoxides with polyoxyalkylenemonoamines having a number-average molecular weight of > 400 g/mol one primary or secondary amino group and at least 4 ether oxygens per molecule from 90 to 100% of the epoxide groups of the starting material having undergone reaction the weight fraction of aromatic groups in the addition compounds being not more than 50% and the addition compounds containing per molecule at least one amino group on which salts can be formed or being present as a salt. The invention also relates to a process for …
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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 June 3, 2004 and granted July 31, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 3, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 3, 2026.
- 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.