Flexible dam
CA 2083890 C · Owner: Dos Santos, Juarez Fontana · Inventors: Dos Santos, Juarez Fontana
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A dam is provided for the temporary local containment of water in a body of standing or slow moving water such as a lake, bay or river. The dam is formed by a flexible barrier having a chamber extending along its lower margin and containing a flexible pipe which is filled with a high density fluid such as barite mud whish anchors, the bottom of the barrier and allows it to accommodate the contour of the bottom of the lake, bay or river. The upper and intermediate portions of the barrier have inflatable chambers, those in the upper portion being filled with air so as to support the barrier at the waters surface and the, chambers in the intermediate portion are filled with water to give them …
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 November 26, 1992 and granted December 22, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 26, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 26, 2014.
- 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.