Treatment of biological waste material
CA 1071528 A · Owner: Commonwealth Industrial Gases Limited (The) · Inventors: Shaw, Robert G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In an activated sludge process for the treatment of liquid wastes, liquid from the main reaction vessel is circulated downwardly through one or more vertical columns. Bubbles of oxygen are introduced at the bottom of the columns to rise upwardly relative to the liquid flow. A gas trap at the bottom of the last column collects small bubbles which are carried out of that column, and releases larger bubbles into the column. Advantageously an air lift may, be used to carry liquid from the main reaction vessel to the columns, and this serves to strip unwanted carbon dioxide from the liquid.
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 February 12, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 12, 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.