Detergent compositions comprising dye transfer inhibitors, and process for making them
CA 2187439 C · Owner: Schamp, Koen Mariette Albert · Inventors: Donoghue, Scott John; Schamp, Koen Mariette Albert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a free-flowing powder having a bulk density of at least 600 g/l comprising: (a) from 20 % to 95 % by weight (on anhydrous basis) of a detergent ingredient selected from the group consisting of aluminosilicate citrate, silica, carbonate, bicarbonate silicate, sulphate, phosphate, water-soluble polymer and mixtures thereof; and (b) from 5 % to 50 % by weight of a copolymer of N-vinylpyrrolidone and N-vinylimidazole. A process for making the free-flowing granules is also provided.
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 April 3, 1995 and granted January 16, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 3, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 3, 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
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.