Baths and method for chemically polishing stainless steel surfaces
CA 2076382 A1 · Owner: Solvay (Societe Anonyme) · Inventors: Barthelemy, Nathalie; Reignier, Marianne; Dujardin, Francois
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Baths for chemically polishing stainless steel surfaces comprising in an aqueous solution, a mixture of hydrochloric acid nitric acid and phosphoric acid, an optionally substituted hydroxybenzoic acid at least one quaternary ammonium salt and an additive selected from perchloric acid and the water-soluble salts thereof.
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 February 18, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 18, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 18, 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.