Adjustable pipe extrusion die with internal cooling
CA 1309564 C · Owner: Yi, Basilio · Inventors: Yi, Basilio; Chan, Harry
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An extrusion die particularly for double-walled, thermoplastic pipes includes an extrusion head, a nozzle, two concentric hollow mandrels carrying die lips and an additional cooling mandrel. The lips have threaded adjusting members to vary the sizes of the die gaps the lips for, the inner wall being provided with electrical heaters. The concentric mandrels have a spider with members for its radial adjustment. The cooling mandrel has substantially annular channels for a coolant, communicating with each other by means of a sharply skewed opening and combined into a number of sections to control intensity of heat exchange.
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
- Granted November 3, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 3, 2009.
- 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.