Novel polyether amides from mixed amines
CA 2038668 A1 · Owner: Texaco Chemical Company · Inventors: Su, Wei-Yang; Champion, Donald H.; Speranza, George P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
NOVEL POLYETHER AMIDES FROM MIXED AMINES (D#80,876-F), Abstract of the Disclosure Novel polyether amides are produced by reacting a polyethylene glycol diamine and a first dicarboxylic acid or an ester thereof with a poly-, oxyalkylene diamine of a molecular weight of at least 500 and a second dicarboxylic acid or an ester thereof, where the polyethylene glycol diamine has the formula NH2-(CH2CH2O)x-CH2CH2-NH2 where x, ranges from 2 to 6, and where the first and second dicarboxylic acid may be the same or different. Suitable dicarboxylic acids include adipic acid azelaic, acid, sebacic acid, dodecanedioic acid terephthalic acid, isophthalic acid, tbutyl isophthalic acid, and mixtures …
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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 March 20, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 20, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 20, 2013.
- 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.