Co-granules and detergent tablets formed therefrom
CA 2180433 C · Owner: Unilever Plc · Inventors: Delwel, Francois; Gordon, James William
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A homogenous co-granule comprising a salt of a ditri- or tetracarboxylic acid and an inorganic acid salt. The salt of a ditri-, or tetracarboxylic acid is preferably an alkali metal citrate or an alkali metal oxydisuccinate. The inorganic salt is preferably alkali metal silicate, in particular sodium disilicate or sodium silicate with a composition satisfying SiO2 : Na2O = 1.0 - 33 ideally 1.8 - 2.3. The, co-granule preferably also comprises at least one polymeric compound being either acid and/or salt, selected from polycarboxylic acid and polypeptides. The invention also provides detergent compositions and tablets comprising these co-granules. The invention further provides the use of …
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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 January 23, 1995 and granted April 25, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 23, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 23, 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
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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.