Flame-resistant polycarbonates containing units deriving from halogenated carbonyl compounds in their polymer chain
CA 2004411 A1 · Owner: Poggio, Sergio · Inventors: Petri, Alberto; Poggio, Sergio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
CASE 2958, "FLAME-RESISTANT POLYCARBONATES CONTAINING UNITS DERIVING FROM HALOGENATED CARBONYL COMPOUNDS IN THEIR POLYMER CHAIN." ABSTRACT, Flame-resistant thermoplastic branched polycarbonates of high molecular weight are prepared from:, (1) a carbonate precursor; (2) at least one dihydroxyaromatic compound of formula: (I), where:, R is a single bond, or a substituted or non-substituted linear or branched C1-C5 alkylene radical, or a group chosen from O,S,SO2 and CO;, X and Y, which may be the same or different are H or CH3;, m and n, which may be the same or different are whole numbers, from 1 to 4;, (3) at least one halogenated carboryl compound of formula: I I, -2-, where: Z is a group …
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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 1, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 1, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 1, 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.