Waste treatment system
CA 2064660 A1 · Owner: Ke-Xin, Liu · Inventors: An-Ming, Li; Yanzhang, Liao; Ke-Xin, Liu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process is disclosed for the treatment of decomposable organic based waste materials and decomposable organic refuse suitable for use on a municipal or urban scale. In one aspect the process includes the steps of aerobically decomposing organic based waste material in a digester for about 4 days in a temperature range of about 44-73°C followed by an anaerobic decomposition (fermentation) step of about 22 days carried out in the same digester. Exhaust gases produced during the aerobic decomposition step are purified prior to being discharged to the atmosphere while biogas produced during the anaerobic decomposition step is collected which may be utilized in power generating applications. …
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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 April 1, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 1, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 1, 2014.
- 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.