Lightning protection of a pitch-controlled wind turbine blade
CA 2500643 C · Owner: Lm Glasfiber A/S · Inventors: Hansen, Lars Bo; Moeller Larsen, Flemming
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A wind turbine rotor is provided, including a rotor hub and blades where each , blade root , is connected to said rotor hub through a pitch bearing in such a manner that the pitch , angle of the blade is adjustable by a turning of the blade about its longitudinal axis. The , blade is provided with at least one electrically conducting lightning downconductor , extending in the longitudinal direction of the blade to the blade root and being electrically , isolated from the pitch bearing. A spark gap is provided between the lightning down-conductor , and the rotor hub, said spark gap being adapted to conduct a lightning current passing through the lightning down-conductor. A sliding …
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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 November 12, 2003 and granted August 21, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 12, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 12, 2025.
- 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.