Culvert end guard
CA 2276867 C · Owner: Harten, Elgin · Inventors: Harten, Elgin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A culvert end guard for use in surrounding and protecting an exterior end portion of a culvert and which is assembled from first and second like half shell sections is disclosed. Each half shell is T-shaped in configuration and includes a central limb portion two end limb portions, an exterior surface and an interior surface. The interior surface of each half shell is further characterized by an open-ended channel of predetermined size and shape that is centrally disposed in and which extends in a direction along the central limb portion and contact areas located on either side of the channel. When the first and second half shell sections are brought together in opposed and closed shell …
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 29, 1999 and granted July 31, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 29, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 29, 2021.
- 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.