Process for manufacture of a high active detergent composition containing succinic acid
CA 2117746 C · Owner: Lievens, Luc M. W. · Inventors: Vanwelssenaers, Noel A.; Lievens, Luc M. W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for making a concentrated liquid detergent composition comprising the steps of: i) mixing succinic anhydride water and an alkaline catalyst, wherein the ratio of succinic anhydride to water is at least 4:1; ii) allowing an exothermic hydrolysis reaction to take place in a buffer tank and iii) mixing the resulting highly active partly neutralised succinic acid with other detergent ingredients.
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 29, 1993 and granted April 27, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 29, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 29, 2015.
- 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.