Process for determining the dye uptake of polyethylene terephthalate fibres
CA 2362102 A1 · Owner: Enka Tecnica Gmbh · Inventors: De Weijer, Anton Peter; Swieringa, Erik; Van Wijk, Robert Jan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention pertains to a process for determining the dye uptake of polyethylene terephthalate fibres in which the fibres are irradiated with highintensity monochromatic light. A light-sensitive sensor is used to measure the Raman scattering and compare it with that of an earlier established model on the basis of Raman spectra of polyethylene terephthalate fibres of known composition and structure. A model is used to calculate the density which , constitutes a quantitative measure of the dye uptake. In the calculation use is made of measurement points from a number of regions in the spectral measuring region of 598 to 1900 cm-1.
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 January 26, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 26, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 26, 2022.
- 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.