Culvert system
CA 2302856 C · Owner: Boulet, Hubert I. · Inventors: Boulet, Edmond E.; Boulet, Hubert I.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A masonry culvert is formed from channel shaped components including bottom components and inverted top components. The bottom components connect together end to end to form an upwardly open channel while the top, components connect end to end on top of the bottom components to complete the culvert. The reduced height culvert components are easier to handle and transport, than full height components. They are more readily manufactured by casting them as, inverted channels over a permanent mould core using movable end pieces and side, panels. The cast component can be lifted directly off the core without the need to, dismantle the core from the interior of a box-shaped culvert section.
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 April 14, 2000 and granted January 16, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 14, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 14, 2022.
- 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.