Treatment of biologically-degradable material
CA 1054729 A · Owner: Zeneca Limited · Inventors: Roesler, Frank C.; Ousby, John C.; Hines, David A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the treatment of liquid carrying biologically degradable material in solution and/or suspension particularly waste-water treatment, wherein the liquid is subjected to a low DOT (dissolved oxygen tension) and/or to a high DOT for a period thereby increasing the ratio of carbon dioxide to cellular material produced by microorganisms present in the liquid. In particular the liquid is subjected to a series of high and/or low DOT shocks.
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 15, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 15, 1996.
- 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.