Method for manufacturing thin-walled articles from crystalline thermoplastic material by thermoforming
CA 1114125 A · Owner: Bellaplast G.M.B.H. · Inventors: Thiel, Alfons W.; Geppert, Barbara
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to an improved method for manufacturing thin-walled articles from crystalline thermoplastic material by thermoforming a web of said material. The method includes forming a web wherein the outer surface regions can act as solidified supportive layers while the core of the web is at a temperature close to but lower than the critical crystalline melting temperature range of said material. The relatively cool outer surface regions of the web are heated prior to thermoforming.
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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
- Granted December 15, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 15, 1998.
- 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.