Cleaning composition
CA 2019642 C · Owner: Unilever Plc · Inventors: Stirling, Thomas; Dawson, Peter Leonard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An aqueous cleaning composition suitable for hard surfaces contains ammonia or an alkanolamine having a boiling point below 200°C at atmospheric pressure, plus a cationic polymer having a molecular weight over 5,000, in an aqueous system containing an organic solvent which has a boiling point below 200°C at atmospheric pressure; preferably with at most a limited amount of surfactant and other materials which do not boil below 200°C at atmospheric pressure.
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 22, 1990 and granted December 27, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 22, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 22, 2012.
- 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.