Activated carbon, production thereof and adsorption using activated carbon
CA 2038686 C · Owner: Kobata, Takeji · Inventors: Kobata, Takeji; Ikenaga, Yoshihiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A novel method and apparatus is provided herein for removing SO2 and/or NO X from an exhaust gas. The method includes the first step of providing a zone containing an activated carbon which comprises carbon microcrystals which are irregularly arranged, and difficultly graphitizable carbon in the form of difficultly graphitizable crosslinking lattices in the gaps among carbon microcrystals and which has a pencil hardness of from B to 6B, a pore size of 100-400.ANG. a specific surface area of 100-500 m2/g, and a pore volume of 1.3-5.0 ml/g. The next step comprises passing the exhaust gas through such zone containing such activated carbon.
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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 March 20, 1991 and granted June 1, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 20, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 20, 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.