Bleaching compositions
CA 2120491 A1 · Owner: The Procter & Gamble Company · Inventors: Ingram, Barry Thomas; Hardy, Frederick Edward
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A bleaching composition useful for the bleaching of stained articles, comprises (a) a urea clathrate of a diacyl or tetraacyl peroxide, e.g. dinonanoyl peroxide, dioctanoyl peroxide or diperoxyazelaic diacetate. The composition may also comprise (b) a compound capable of yielding hydrogen peroxide in an aqueous medium e.g , sodium perbonate. The composition which can be effective against, carotenoid stains is generally in granular form and may be formulated as a laundry detergent composition that also comprises (c) an anionic, nonionic, cationic, ampholytic or zwitterionic detersive surfactant and, optionally, (d) a detergent builder and/or (e) a bleach activator.
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 28, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 28, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 28, 2014.
- 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.