Method and apparatus for laying pipe having bell and spigot connections in a vertical wall trench
CA 2299803 A1 · Owner: Gravel, Andre Joseph · Inventors: Gravel, Andre Joseph; Gravel, Marc Andre
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for laying pipe with bell and spigot connections in a vertical wall trench. A first step involves providing a rigid guide chute having a feed end and a discharge end. The guide chute is radiused within deflection limits for pipe to be used. A second step involves mounting the guide chute to a mobile support. This enables the guide chute to be moved along a pipeline right of way. A third step involves inserting the discharge end of the guide chute into a vertical wall trench. A fourth step involves using a pipe feeder at the feed end of the guide chute to exert and maintain a force upon a pipe string sufficient to maintain all bell and spigot connections of the pipe …
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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 March 1, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 1, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 1, 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
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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.