Bleaching compositions
CA 2312901 A1 · Owner: Corma-Canos, Avelino · Inventors: Jorda-Moret, Jose Luis; Greenhill-Hooper, Michael John; Rey-Garcia, Fernando
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a bleaching composition. In particular the invention provides a bleaching composition which comprises: (i) a bleaching agent and , (ii) as bleach catalyst, a polyoxometalate of Keggin Dawson or Finke , structure and having the general formula (II):(A')a'(Cox'Yy',Mm',Oo).cH2O wherein the or each A', which may be the same or different is a cation; a' , has a value such that (A')a' counters the anionic charge of (Cox' Yy', Mm', Oo); x' has a value of 0.25 to 4; the or each Y which may be the same or , different, represents P Si or Co; y'is 1 or 2; o has a value of 34 to 68; the or each M, which may be the same or different represents W, Mo, V, Nb or Ta; , m' has a …
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 3, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 3, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 3, 2020.
- 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.