Chromium-free impregnated activated carbon for adsorption of toxic gases and/or vapors
CA 2019843 C · Owner: Calgon Carbon Corporation · Inventors: Doughty, David Templeton; Groose, James Edward
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Impregnated activated carbon adsorbents for the removal of toxic materials from gas streams are used in a variety of respiration and collective filter applications. The activated carbon impregnated adsorbents in the present invention remain effective in removing toxic gases and/or vapors in military, industrial and other applications and, are free of chromium and its potential health hazards. Generally these activated carbons are comprised of an activated carbon adsorbent impregnated so as to result in an activated carbon containing 0 to 14% copper and 2 to 16% zinc, optionally supplemented according to the desired characteristics with silver, triethylenediamine and molybdenum, prepared …
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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 26, 1990 and granted July 31, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 26, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 26, 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.