Improvements relating to limescale removing compositions
CA 2254844 C · Owner: Novita, Luciano · Inventors: Novita, Luciano; Coruzzi, Marilena
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In limescale-removing compositions of pH 1-5 comprising 1-15 wt.% of a , dicarboxylic acid and 1-30 wt.% of an anionic surfactant other than fatty acid, the presence of 0.1-10 wt.% of a fatty acid prevents low temperature , instability of the product which leads to precipitation of the dicarboxylic acid.
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 25, 1997 and granted October 21, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 25, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 25, 2019.
- 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.