Process for enhancing the whiteness, brightness and chromaticity of paper making fibres
CA 2105922 A1 · Owner: Novartis Ag · Inventors: Von Raven, Axel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for enhancing the whiteness, brightness and chromaticity of paper making fibres Abstract of the Disclosure, The present invention relates to the addition of photosensitising compounds to woodpulps and mixtures thereof for enhancing their whiteness brightness and chromaticity, as well as to the paper making fibres so obtained and the use thereof.
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 September 10, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 10, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 10, 2015.
- 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.