Quiet clutch fan blade
CA 2065445 A1 · Owner: Siemens Automotive Limited · Inventors: Brackett, Stephen E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A clutch fan (20) has a new and unique blade design that results in quieter and more efficient operation. The blade design involves the leading edge (30) having inner (34) intermediate (36), and, outer regions (38) such that the intermediate region (36) is of increasing skew in the direction of rotation and the outer region (38) is of decreasing skew. The pitch ratio increases as a function of increasing blade radius. Along the outer region (38) the , blade (22) increases in pitch on a defined curvature as a function of blade radius and angle to form a tip curl.
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 10, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 10, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 10, 2012.
- 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.