Compression moulding method
CA 2310034 A1 · Owner: Trisport Limited · Inventors: Kelly, Paul Andrew
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of compression moulding an article from rubber moulding material incorporating hollow inserts (10, 35) avoids damage to the inserts. Where compression moulding takes place in an enclosed mould at an elevated pressure the pressure can distort and damage the hollow inserts (10 35) especially if , they are of plastics. In order to avoid such distortion and damage the method , compresses during moulding creating a pressure in a cavity (20 36) of the , insert (10, 35) which substantially balances the pressure exerted on the exterior of the insert by the rubber moulding material in the mould. The pressure in the cavity (20, 36) is preferably produced by introducing some rubber …
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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 10, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 10, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 10, 2020.
- 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.