Reducing nox emissions with group iiib compounds
CA 2032833 A1 · Owner: Chin, Arthur A. · Inventors: Chin, Arthur A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for regeneration of cracking catalyst while minimizing NOx emissions is disclosed. A Group IIIB based deNOx additive is present in an amount and in a form which reduces NOx emissions. Relatively small amounts of lanthanum or yttrium oxides,or lanthanum titanate, preferably impregnated on a separate support are effective to reduce NOx produced in the regenerator. The additive converts NOx to nitrogen even when Pt CO combustion promoter and some excess oxygen are present in the regenerator.
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 December 20, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 20, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 20, 2012.
- 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.