Lavatory cleansing block
CA 2044490 C · Owner: Unilever Plc · Inventors: Joy, Bryan Stuart; Rennie, George Kerr
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A lavatory rim cleansing block comprising: 30 to 80 % by weight of an anionic surfactant; 0 to 50 % by weight of an inert or electrolyte filler; 5 to 50 % by weight of a water-soluble bleaching agent; 5 to 15 % by weight of a hydrophobic structurant, preferably an oily liquid perfume. The weight ratio between the anionic surfactant and the filler, if electrolytic, is preferably greater than 2 and the preferred water-soluble bleaching agent is potassium dichloro cyanurate.
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 June 13, 1991 and granted December 17, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 13, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 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.