Catalytic filter material and method of making same
CA 2228597 C · Owner: Plinke, Marc · Inventors: Plinke, Marc; Sassa, Robert L.; Brinckman, Glenn A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is an improved catalytic filter material for use in removing contaminants such as NOx from a fluid stream . The filter of the present invention employs composite fibers of expanded polytetrafluoroethylene (PTFE) filled with catalytic particles. The composite fibers are chopped into staple fibers and made into a felt material. Preferably the felt material is , then laminated on at least one side with a protective microporous membrane. The combined filter removes both macro-particles such as dust, from the , filter stream before the dust can clog active catalytic sites and effectively catalytically converts undesirable contaminants in the fluid stream to …
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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 June 7, 1996 and granted April 17, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 7, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 7, 2018.
- 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.