Process for the disinfection and aerobic stabilization of sewage sludge
CA 2010156 C · Owner: Fuchs, Martin · Inventors: Fuchs, Leonhard; Fuchs, Martin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The process for the disinfection and aerobic stabilization of concentrated sewage sludge in several steps, comprising one or more heat-insulated containers preferably with stirring, with the addition of an oxygen-containing gas, is carried out by that a) the sludge coming in and having been concentrated to at least 2% of dry matter is brought to reach the thermophilic temperature range of >50 °C if, required with pre-heating, then solely by an aerobic degradation without supplying external heat within from 2 to 4 days, b) the sludge is disinfected by further aerobic degradation without supplying external heat at from 50 °C to 55 °C for at least 20 hours or at >55 °C for at least 10 hours, …
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
- Filed February 15, 1990 and granted March 19, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 15, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 15, 2012.
- 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.