Treatment of waste liquor in a vertical shaft bioreactor
CA 2247409 C · Owner: Deep Shaft Technology Inc. · Inventors: Pollock, David C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved apparatus for treating waste mixed liquor comprising a long vertical downcomer chamber (10), an adjacent long vertical riser chamber (12) a surface basin (14), said downcomer chamber (10) and said riser chamber (12) operatively communicating directly with each other at their lower ends and through said basin (14) at their upper ends to form a circulatory loop; means (28) for injecting an oxygen-containing gas in said downcomer (10) and riser chambers at depth; a flotation-sedimentation vessel (52) adjacent said surface basin (14); a first waste liquor influent conduit (20) opening into said riser chamber (12) at depth and operatively communicating with said vessel (52) 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 February 27, 1997 and granted January 7, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 27, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 27, 2019.
- 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.