Enhanced polyester copolymer fiber
CA 2004838 A1 · Owner: Hoechst Celanese Corporation · Inventors: Blaeser, Eric J.; Nichols, Carl S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Invention The invention is a method of producing a polyester filament which has a superior combination of tensile dyeability and shrinkage, properties. The method comprises forming a polyester-polyethylene glycol copolymer from a mixture consisting essentially of a terephthalic acid or dimethyl terephthalate ethylene glycol, and, polyethylene glycol with the polyethylene glycol having an average molecular weight of between about 200 and 1500 grams per mole and being added in an amount sufficient to produce a polyesterpolyethylene glycol copolymer in which the polyethylene glycol is present in an amount of between about 1.0 and 4 percent by weight of the copolymer formed; …
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 December 7, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 7, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 7, 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
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.