Warm cycle thermoforming process of thermoplastic material using a flat free parison
CA 2260856 A1 · Owner: Duplessy, Herve · Inventors: Duplessy, Herve
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method wherein a flat parison (2) is extruded using a flat die (1) in such a way that it hangs freely either at the extruder outlet or following a heat treatment and the parison is squeezed in a moulding device (7) consisting of a mould (3) and a matching opposite mould (4) with a vertical land (5) and separated by a cutting means for cutting the upper portion (6) of the flat parison. Thermoforming is preferably carried out by injecting compressed air into the opposite mould cavity after retracting the moulding device.
Read the whole patent
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 July 16, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 16, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 16, 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.