Shaped articles based on high molecular weight polyesters
CA 2132402 A1 · Owner: Homann, Walter K. · Inventors: Homann, Walter K.; GROßE-PUPPENDAHL, THOMAS
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A shaped article made of a high molecular polyester containing olefinic double bonds is disclosed. The polyester is prepared from an organic dicarboxylic acid and a mixture of an alkanediol (97.5 to 100 mol%) with 2-butene-1,4-diol (0 to 2.5 mol%). After shaping, the article is irradiated with an ionizing radiation. The dose is generally between 1 kGy and 2000 kGy and at least 200 kGy for the polyester which does not comprise 2butene-1,4-diol. The shaped articles according to the invention have outstanding mechanical properties such as high impact, strength, elongation and impact strength. They are prepared from readily accessible and inexpensive monomers and can be readily recycled after …
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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 September 19, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 19, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 19, 2016.
- 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.