Use of triazine-based uvas for use as quenchers in paper-making processes
CA 2252575 A1 · Owner: Ciba Specialty Chemicals Holding Inc. · Inventors: Hochberg, Robert; Metzger, Georges; Rohringer, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a process for the inhibition (quenching) of the effect of anionic fluorescent whitening agents on a substrate comprising , treating the substrate with a triazine UVA compound some of which are new , compounds.
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 May 22, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 22, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 22, 2019.
- 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.