Apparatus and method for producing pipe and pipe produced thereby
CA 2187126 C · Owner: Presby Patent Trust · Inventors: Presby, David W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus and method for perforating corrugated plastic pipe from the inside of the pipe to the outside and the pipe produced by the method. The apparatus has a perforating device attached to an elongated support member. Perforations are created by advancing pipe over the perforating device or by advancing the perforating device into the interior of the pipe. Where the pipe is advanced over the perforating device a carriage, holding the pipe, is riding on a track which guides the pipe into engagement or into cutting or perforating proximity with the perforating device. The perforating device includes a housing holding motors with cutters attached to them. The cutters cut the inner …
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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 October 4, 1996 and granted November 20, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 4, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 4, 2018.
- 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.