Method at anaerobic wastewater treatment
CA 1231184 A · Owner: Purac Aktiebolag · Inventors: Hoglund, Hans; Peterson, Viking; Annergren, Goran
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method of treating wastewater obtained from closed manufacture of mechanical or chemi-mechanical cellulose pulp which treatment is carried out in a hydrolysis/acid fermentation step and a methane fermentation step with subsequent sludge separation and recycling of separated 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 January 5, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 5, 2005.
- 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.