Method of treating sewage
CA 1187698 A · Owner: Leen, Charles J. · Inventors: Leen, Charles J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method is disclosed for treating sewage in which the combustible components of the sewage are separated from the sewage and utilized as a primary fuel. Scum is collected preferably by skimming, from screened sewage. This scum comprises oils, greases, fats, water and intermixed solid material. The collected scum is then transferred to a separation tank. The scum is maintained within the tank in a quiescent and substantially nonagitated state for at least twelve hours, during which the combustible oils greases, fats and the like are rendered separable from the other components of the scum. The scum is then conveyed from the tank to a processing unit where the fats oils, greases and, the …
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 28, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 28, 2002.
- 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.