Process for activated-sludge treatment of sewage or industrial waste water
CA 1332007 C · Owner: Nakamura, Eiichi · Inventors: Fujii, Masahiro; Nakamura, Eiichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A fluidized-bed type activated-sludge treatment of sewage or industrial waste water is characterized in that: a fine powder of the granulated blast furnace slag is added to an aeration tank of the activatedsludge treatment installation to facilitate the treatment. In a fixed-bed type activated-sludge treatment of the sewage or industrial waste water, the granulated blast furnace constitutes a main constituent element of a ceramic material to be mounted in the aeration tank so as to serve as a fixing carrier of the activated sludge.
Read the whole patent
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 September 13, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 13, 2011.
- 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.