Acidic limescale removal compositions
CA 2287835 A1 · Owner: Bianchetti, Giulia Ottavia · Inventors: Caselli, Alberto; Pace, Luigi; Bianchetti, Giulia Ottavia
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to liquid acidic thickened compositions having a viscosity of at least 10 m Pa s, when measured with a Carrimed rheometer at 5 N/m2 at 20 ~C, and a pH below 4, said composition comprising a thickening system comprising a zwitterionic surfactant and an anionic surfactant at a weight ratio of said zwitterionic surfactant to said anionic surfactant of at least 2:1, and from 0.1 % to 70 % by weight of the total composition of an acid. Said compositions deliver excellent limescale removal performance as well as outstanding greasy soap scum cleaning on hard-surfaces. The compositions are suitable for the cleaning of non-horizontal and horizontal surfaces.
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 24, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 24, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 24, 2020.
- 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.