Draft tube aeration with check valves
CA 1062122 A · Owner: Dominion Engineering Works Limited · Inventors: Koeller, Paul
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A hydraulic turbo-machine such as a Francis turbine has a draft tube with air admission provision to stabilize flow. A plurality of air boxes are provided having a long upstream surface and a short downstream surface to provide an inductive effect with the flow of water downwardly thereover. A non-return valve at the box downstream face substantially precludes the ingress of water within the box during conditions of disturbed flow, so that the breathing capability of the box is optimized.
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 September 11, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 11, 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.