Pneumatic tire with improved snow and ice traction
CA 2110069 C · Owner: Bridgestone Corporation · Inventors: Futamura, Shingo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composite tread structure (22) comprises a law modules at -20°C rubber outer layer (23) and a high modules at -20°C rubber inner layer (24) thicker than the outer layer. The outer layer is preferably made from a rubber having a glass transition temperature lower than the glass transition temperature of the rubber comprising the inner layer. Such a tire generally improves snow and ice handling and maintains good wet and dry traction. A pneumatic tire (10) having improved snow and ice traction employs a composite tread (22) comprising a low modules at -20°C rubber outer layer component (23) and a high modules at -20°C rubber inner layer rubber component (24) thicker than the outer layer …
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
- Filed November 26, 1993 and granted November 21, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 26, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 26, 2015.
- 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.