Use of bleach activators for low perhydroxyl concentrations
CA 2205574 C · Owner: The Procter & Gamble Company · Inventors: Miracle, Gregory Scot; Burckett-St.Laurent, James C.; Kott, Kevin Lee
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Improved aqueous bleaching solutions formed by reacting a bleach activator having a perhydrolysis selectivity coefficient of 5 or greater and a low-pH perhydrolysis-efficiency coefficient of 0.15 or higher are provided. More specifically, the invention relates to bleaching solutions which provide enhanced cleaning/bleaching benefits through the selection of bleach activators at mildly alkaline washing solutions or in the presence of reducedlevels of hydrogen peroxide.
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 November 3, 1995 and granted February 6, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 3, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 3, 2017.
- 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.