Method for forming a socket on a pipe biaxially oriented polyvinyl ch loride
CA 2248208 A1 · Owner: Wavin B.V. · Inventors: Visscher, Jan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The method comprises the successive steps of: placing a support in an end section of the pipe, heating the pipe in the region of the end section; deforming the pipe to produce a socket in the region of the heated end section; the heated end section being supported internally while the socket is being formed; cooling the pipe in the region of the end section the end , section being supported internally during the cooling operation; and removing the support from the pipe, for the purpose of heating the internally supported end section of the pipe, said end section first being heated until said end section has reached, substantially homogeneously the glass transition , temperature of …
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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 10, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 10, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 10, 2019.
- 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.