Method of producing centrifugally cast, glass fiber reinforced plastic tubes
CA 2358577 A1 · Owner: Carlstrom, Borge · Inventors: Carlstrom, Borge
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method of producing centrifugally cast glass fiber , reinforced plastic tubes. According to said method a liquid curable resin , which contains a filler is introduced into a rotating die together with glass fibers, curing additives, possibly also with sand. Said die has a temperature of between 40 ~C and 75 ~C at the time of introducing the raw materials. For the layers in the outer surface of the tube a resin is used which has a gel time that is the same or equal the gel time of the resin used for the interior of the tube. The resin used has a filler content of at least 40 %. Once the exothermic reaction is started, warm water is sprayed onto the die to …
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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 January 19, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 19, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 19, 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
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.