Two-phase anaerobic digestion of carbonaceous organic materials
CA 2180016 C · Owner: Srivastava, Vipul J. · Inventors: Srivastava, Vipul J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for improved methane production by two-phase anaerobic digestion of organic carbonaceous material in which organic carbonaceous material is fermented under anaerobic conditions in an acid phase digester forming a , liquid/solids effluent, the liquid/solids effluent is fermented under anaerobic conditions in a methane phase digester product gas comprising , methane is withdrawn from the methane phase digester and oxygen is introduced , into the methane phase digester. In a preferred embodiment the methane phase , liquid effluent is passed through a CO2 stripper resulting in stripping of CO2 and H2S from the methane phase liquid effluent. The resulting stripper liquid effluent …
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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 December 23, 1994 and granted November 7, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 23, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 23, 2016.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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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.