Spray-dried component comprising chelant
CA 2249268 C · Owner: Procter & Gamble Company European Technical Center N.V. · Inventors: Doumen, Achille Jules Edmond; Donoghue, Scott John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a spray-dried component which is in the form of a free-flowing particle with high chelant activity comprising: i) at least 50 %, preferably at least 60 %, by weight of a chelant; ii) from 1 % to 25 % preferably from 5 % to 10 %, by weight of a alkali metal or alkaline earth , metal sulphate; and iii) preferably less than 10 % by weight free moisture.
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 March 21, 1997 and granted February 5, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 21, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 21, 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.