Beaver controlling culvert attachment
CA 2330892 C · Owner: Poirier, Karen · Inventors: Poirier, Karen; Poirier, Keith
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A beaver controlling culvert attachment prevents beavers from disturbing the flow of water, through a culvert. An upstream unit includes a vertical pipe having an upper grate which prevents, the entrance of beavers and debris while allowing the entrance of water , during periods of high water levels. A horizontal pipe has an upstream end attached to an upper portion of the vertical, pipe and a downstream end attached to an upstream end of the culvert by an attachment plate. A, basket insert is carried within the vertical pipe and is movable between an , in-use position wherein a grate prevents entrance to the bottom of the vertical pipe and a , clean-out position, wherein the grill is …
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 January 11, 2001 and granted December 2, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 11, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 11, 2023.
- 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.