Method and device for sludge treatment
CA 1069302 A · Owner: System Ab Infoteknik · Inventors: Bjermo, Gote H.E.; Tresjo, Paul E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Metal hydroxides in a sludge are converted to a product which does not cause pollution; the sludge is dewatered until it becomes thixotropic and is formed into a thin layer or a film which is subjected to a drying operation so that the layer or film is transformed into scales or grains of metal hydroxide; the scales or grains are subjected to calcination the crystal water, being removed and the scales or grains being transformed into a powder of metal oxide, which is non-poisonous.
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 January 8, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 8, 1997.
- 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.