Domestic water clarifier
CA 2212503 C · Owner: Kidd, William J. · Inventors: Kidd, William J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A domestic water clarifier comprising a storage tank and a batch tank having an annular inner wall is described. Raw water is pressurized and injectedinto the batch tank along with a quantity of a flocculent chemical such that theraw water and the flocculent chemical swirl around the inner annular wall of the tank, thereby mixing the raw water and the flocculent chemical. The mixture is then allowed to stand, thereby separating into clarified water and floc. The clarified water is drawn off to the storage tank and stored until needed. The batch tank is then flushed to remove the floc and to prepare the batch tank for the next clarification cycle.
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 August 7, 1997 and granted January 19, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 7, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 7, 2019.
- 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.