Polyhydroxy fatty acid amides in polycarboxylate-built detergent
CA 2090238 C · Owner: Mao, Mark H. · Inventors: Honsa, Sandra L.; Mao, Mark H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed are detergent compositions containing polycarboxylate builders and one or more anionic nonionic, or cationic, detersive surfactants or mixtures thereof, improved by the inclusion of certain polyhydroxy fatty acid amide surfactants. The compositions comprise at least 1 % by weight polycarboxylate builder and at least 1 % by weight of a polyhydroxy fatty acid amide of formula (I) wherein R1 is H, C1-C4 hydrocarbyl 2-hydroxy ethyl, 2-hydroxy-propyl, or a mixture thereof; and R2 is a C5-C31 hydrocarbyl; and Z is a polyhydroxyhydrocarbyl having a linear hydrocarbyl chain with at least 3 hydroxyls directly connected to the chain, or an alkoxylated derivative (preferably ethoxylated or …
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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 25, 1991 and granted September 1, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 25, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 25, 2013.
- 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.