Composition and method for bleaching a substrate
CA 2383935 A1 · Owner: Unilever Plc · Inventors: Twisker, Robin Stefan; Thijssen, Rob; Kalmeijer, Robertus Everardus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates a method of bleaching a substrate that comprises applying to a substrate, in an aqueous medium a specified ligand which forms , a complex with a transition metal the complex catalysing bleaching of the substrate by atmospheric oxygen. Also provided in an aqueous bleaching composition substantially devoid of peroxygen bleach or a peroxy-based or generating bleach system. Also provided is a method of treating a textile such as a laundry fabric whereby a complex catalyses bleaching of the textile by atmospheric oxygen after the treatment. The catalyst may be used in dry form or in a liquor that is then dried, such as an aqueous spray-on fabric treatment fluid or a …
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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 August 16, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 16, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 16, 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
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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.