Process for the preparation of calcium sulfonate/calcium carbonate complexes
CA 2057196 A1 · Owner: Studeneer, Adolf · Inventors: Studeneer, Adolf; Eife, Karl-Heinz; Fossati, Franco
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for the preparation of calcium sulfonate/calcium carbonate complexes, In the process for the preparation of superbasic calcium sulfonate/calcium carbonate complexes, a mixture of - oil-soluble aralkylsulfonic acids, - calcium oxide and/or calcium hydroxide and - carboxylic acids, is reacted in the presence of a liquid non-polar reaction medium, water-soluble polar solubilizing agents and water. The reaction with carbon dioxide is then carried out. Water-immiscible or water-insoluble carboxylic acids are employed as the carboxylic acids. The process products are used as anticorrosive agents.
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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 December 6, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 6, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 6, 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.