Method of securing a filter element to a blade of a fan
CA 2124889 C · Owner: Kuryliw, William · Inventors: Kuryliw, William
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is described a method of securing a filter element to a blade of a fan. Firstly, form a cavity within a fan blade. The cavity has a tip end oriented toward a tip of the fan blade and a root end oriented toward a root of the fan blade. Secondly, form at least one flow passage extending from one broad surface of a fan blade through the cavity to an opposed broad surface of the fan blade such that air, circulates through the cavity via the flow passages upon movement of the fan blade. Thirdly, form an access opening through which a filter element is inserted into the cavity.
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 June 1, 1994 and granted July 28, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 1, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 1, 2016.
- 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.