Wastewater treatment method
CA 1254310 A · Owner: Purac Aktiebolag · Inventors: Welander, Thomas G.; Andersson, Per-Erik
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
22626/209, Abstract of the Disclosure, The problem of the toxic effect on bacteria culture of resin and fatty acids in wastewater during the anaerobic treatment of wastewater is solved by additions of iron or aluminium and calcium or magnesium to the wastewater. 3301
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 May 16, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 16, 2006.
- 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.