Conduit isolating gate system
CA 2003019 A1 · Owner: Dufault, Denis · Inventors: Dufault, Denis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A gate system is installed at the intersection of three conduits in a liquid waste treatment plant. The three conduits include a vertical and cylindrical pipe conduit and two horizontal conduits. The system comprises a semicylindrical gate of which the geometrical axis coincides with the longitudinal axis of the vertical pipe conduit and of which the radius is equal to that of the latter conduit. In a first angular position the gate can be translated along the above mentioned longitudinal axis and toward the vertical conduit to isolate a first one of the horizontal conduits while, in a second angular position it can be translated to isolate the other one of these horizontal conduits. …
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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 15, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 15, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 15, 2011.
- 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.