Deep-draw thermoforming of thermoplastic sheet
CA 1099883 A · Owner: The Standard Oil Company · Inventors: Judzis, Arnis; Bond, Thomas J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus is disclosed for producing hollow articles of thermoplastic sheet material having large L/D ratios. The apparatus comprises a heated mandrel and a mold cavity with means provided for securing a heated thermoplastic sheet to position between the mandrel and mold cavity with means for moving the mandrel through the heated thermoplastic sheet so as to draw the heated thermoplastic onto the walls of the mandrel and into the mold cavity. A domed guide means is provided located directly above and at the top of the mold cavity with the guide means having internal walls which are greater in diameter than the internal diameter of the mold cavity. The domed guide means is also equiped …
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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 April 28, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 28, 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.