Variable pitch fan
CA 2403632 C · Owner: Flexxaire Manufacturing Inc. · Inventors: Nelson, Terry D.; Mccallum, Jonathan E.; Gerwing, Murray C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved variable pitch fan comprising a fan hub with fan blades extending radially outward from the fan hub and mounted for rotation about respective radially extending axes corresponding to each fan blade. Each fan blade has a blade surface extending perpendicularly to the radially extending axis of the fan blade each blade surface lying between respective outer edges of the corresponding fan blade and facing rearward. A pitch shifting mechanism is mounted in the hub and interconnects with the fan blades to control the rotational position of each fan blade about the corresponding radially extending axis of the fan blade. The respective outer edges of each fan blade diverge as the fan …
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 17, 2002 and granted April 5, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 17, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 17, 2024.
- 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.