Phosphorus-containing copolymers and their use
CA 2026255 A1 · Owner: Ciba-Geigy Ag · Inventors: Renner, Alfred
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
K-17766/+, Phosphorus-containing copolymers and their use Abstract, Phosphorus-containing copolymers obtainable by reacting an epoxide compound with a dialkyl pentaerythrityl diphosphite of the formula I (I), in which R1 and R2 independently of one another are a C1-C4alkyl group are suitable for, use as fire-retarding additives for plastics in particular for epoxy resins. If the diphosphite is reacted with an excess of a diepoxide epoxy resins containing chemically linked phosphorus are obtained, and, after curing these afford flameproof, crosslinked products having good properties.
Read the whole patent
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 September 26, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 26, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 26, 2012.
- 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
Timeline From CIPO dates
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.