Two-stage hybrid biofiltration
CA 2312557 A1 · Owner: Alberta Research Council, Inc. · Inventors: Coleman, Richard Nigel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A hybrid filter system for degrading a sulfur-containing compound having a primary stage, sacrificial filter and a secondary stage biofilter is disclosed. This hybrid filter system, significantly increases the lifetime of the biofilter providing a cost effective and removal , effective biofiltration filter system. The process consists of two filtration stages, a primary stage, sacrificial filtration and a secondary stage biofiltration. A small percentage of the , sulfur-containing compound is oxidized to elemental sulfur which blocks the pore space of the filter, matrix. The primary stage sacrificial filter is used to trap and remove elemental sulfur which is, produced when the …
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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 27, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 27, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 27, 2022.
- 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.