Grit removal devices and methods
CA 2052184 A1 · Owner: Oyler, Kenneth W. · Inventors: Oyler, Kenneth W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The efficiency of operation of vortex grit removal devices typically, used in wastewater treatment plants is improved by measuring changes in, the vertical level of liquid contained in the device as the grit removal operation progresses and using such level change measurements to automatically control the speed of rotation of the grit remover's rotor used to impart vortical motion to such body of liquid. Devices for performing such improved vortex grit removal operations are disclosed.
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 September 24, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 24, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 24, 2013.
- 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.