Monolithic catalysts for conversion of sulfur dioxide to sulfur trioxide
CA 2043539 C · Owner: Mecs, Inc. · Inventors: Felthouse, Timothy R.; Vavere, Atis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Chemically and thermally stable monolithic catalysts are disclosed having platinum or alkali metalvanadium active phases for use in the conversion of sulfur dioxide to sulfur trioxide. The platinum catalyst comprises a foraminous ceramic support which has at its wall surfaces a high surface area substrate for an active catalyst phase and, a combination of a platinum active phase and a promoter on the substrate. The substrate preferably comprises silica provided, for example, by application of a silica washcoat. The promoter is selected from among compounds of zirconium hafnium and titanium. The alkali-vanadium catalyst comprises a foraminous ceramic support having a porous silica substrate …
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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 May 30, 1991 and granted March 4, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 30, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 30, 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.