Die assembly for tire tread extrudate
CA 1231814 A · Owner: Firestone Tire & Rubber Company (The) · Inventors: Nadeau, John F.; Varvaro, Alexander J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A die assembly for generating a green tread extrudate for pneumatic tire fabrication is presented. Fundamentally, the invention includes a preform die of fixed configuration, having passages and openings therein for passing both a base stock material and a cap stock material. The openings are separated by a partition. Upper and lower final die plates are then formed to communicate with the openings, one for the cap stock and the, other for the base stock. The configuration of the die portion of the die plates control not only the external geometry of the resulting extrudate but, also the geometry of the junction between the cap stock and the base stock in the extrudate. The invention …
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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 January 26, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 26, 2005.
- 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.