Catalyst
CA 2000998 A1 · Owner: Bhattacharya, Ashok K. · Inventors: Bhattacharya, Ashok K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A catalyst for the purification of motor vehicle exhaust gases comprising a copper component comprising at least one copper oxide carried on a support and at least one oxide from Category (i) and/or Category (ii), which categories are defined as follows: (i) an oxide of a metal which is a lanthanide or a metal from Group IIA and/or IIb of the Mendeleev periodic table; (ii) an oxide of a transition metal in which the transition metal is in a first oxidation state having a second higher, oxidation state at an, energy level close to that of the first oxidation state.
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 October 19, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 19, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 19, 2011.
- 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.