Apparatus for use in a sewage clarifier
CA 2238792 C · Owner: The City Of Calgary · Inventors: Do, Paul
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for use in a conventional wastewater treatment plant of the type including a clarifier with a launder for use upstream of an anaerobic treatment facility, includes a dam assembly defined by a dam wall and a sluice ramp for mounting in the, launder downstream of a control dam for minimizing turbidity and consequently oxygen, uptake in the wastewater discharged from the launder. The apparatus reduces noise, emission of noxious and malodorous gases loss of volatile fatty acids from , the wastewater, uptake of oxygen into the wastewater and algae growth of in the clarifier.
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
- Filed May 27, 1998 and granted February 12, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 27, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 27, 2020.
- 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.