Pneumatic tyre manufacture
CA 1070920 A · Owner: Dunlop Limited · Inventors: Goodfellow, Anthony G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to an improved method and apparatus for use in moulding the tread portion of a pneumatic tyre. The apparatus includes a solid or substantially solid annular former of elastomeric material and a stretching device which is actuable to cause or permit an increase in diameter of the former and a support engageable with the inner periphery of the former. The method includes the steps of locating an annular, substantially inextensible breaker on the radially outer surface of the former, increasing the diameter of the former to stretch the breaker, locating the former with the breaker in the stretched condition thereon in a mould moulding a tyre portion, over the stretched …
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 February 5, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 5, 1997.
- 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.