Fluid impeller
CA 2227575 C · Owner: Elta Fans Limited · Inventors: Lack, Christopher Winston; Fenner, David Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A fluid impeller (such as a fan for moving air or gases) comprises one or more rotatable fluid impelling blades (200); and a flow guiding member (220) adjacent to an edge of the blades (200) at least a blade (200) facing surface of the flow guiding member being formed substantially as a segment of a sphere of radius r1 about a centre of curvature (280). Each blade (200) has a flow guiding member abutting edge (290) curved substantially to fit against a sphere of radius r1.
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 9, 1996 and granted January 14, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 9, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 9, 2018.
- 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.