Methods for lowering the nitrogen oxides content of exhaust gases
CA 2048472 A1 · Owner: Wakihara, Masataka · Inventors: Chiba, Yoshikazu; Wakihara, Masataka; Nishikawa, Yuji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Catalytic cracking or selective contact reduction of NOx in exhaust gases is improved in these known processes by use of a Chevrel phase compound as the catalyst. The catalytic compounds have the formula Mx Mo6 S8-y and/or Mx Mo6 S8-y Oz, where M is metal S is, chalcogen, O is oxygen, x is 1-5 8-y is 7.4-8.5 and z, is from 2 to 8.
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 August 6, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 6, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 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.