Polyester based on poly(trimethylene terephthalate)
CA 2426137 A1 · Owner: Teijin Limited · Inventors: Tsukamoto, Ryoji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polytrimethylene terephthalate polyester which is composed mainly of trimethylene terephthalate repeating units contains at least one compound , selected from the group consisting of alkali metal compounds alkaline earth , metal compounds and manganese compounds in an amount of 10 to 150 ppm in terms of metal element(s), and satisfies the relationship (I): 0 <= P/M <= 1 (I) wherein P is the molar amount of phosphorus contained in the polyester; and M is the total molar amount of alkali metals alkaline earth metals and , manganese contained therein.
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 July 5, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 5, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 5, 2024.
- 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.