Aerobic/anaerobic sludge digestion process
CA 1115432 A · Owner: Union Carbide Corporation · Inventors: Matsch, Ladislas C.; Gould, Michael S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, A process for digestion of sludge wherein the sludge is oxygenated in a first digestion zone at temperature of from 35° to 75° to partially reduce the biodegradable volatile suspended solids content of the sludge. The partially stabilized sludge is anaerobically digested in a covered second digestion zone at temperature of from 25° to 60°C to further reduce the biodegradable volatile suspended solids content of the sludge to less, than about 40% of the biodegradable volatile suspended solids content of the sludge introduced to the first digestion zone. S P E C I F I C A T I O N - 1 -
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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
- Granted December 29, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 29, 1998.
- 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.