Polyhydroxy fatty acid amides in brightener-containing liquid detergent compositions
CA 2092560 C · Owner: The Procter & Gamble Company · Inventors: Honsa, Sandra L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides highly-built liquid detergent compositions comprising: one or more conventional anionic nonionic or cationic detersive surfactants; one or more optical brighteners; one or more polyhydroxy fatty acid amides of general formula (I) wherein R1 is H, a C1-C4 hydrocarbyl 2-hydroxy ethyl, 2-hydroxy propyl, or mixtures thereof R2 is a C5-C31, hydrocarbyl group, and Z is a polyhydroxyhydrocarbyl having a linear hydrocarbyl chain with at least 3 hydroxyl groups directly connected to the chain, or an alkoxylated derivative thereof; one or more detergent builders; and a liquid carrier; wherein the optical brightener is added to the detergent composition in admixture with …
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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 December 15, 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
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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.