Polymer-protected bleach precursors
CA 2055423 A1 · Owner: Unilever Plc · Inventors: Garcia, Rigoberto F.; Coppinger, Elizabeth M.; Irwin, Charles F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A particulate detergent composition additive is disclosed wherein each particle is an intimately blended mixture of a bleach precursor, a binder and a sugar. The binder is a non-crosslinked polymer having in an unplasticized form a Tg of at least 40°C. Suitable sugars include sorbitol glucose, sucrose and lactose.
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 November 13, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 13, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 13, 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.