Rubber composition for tire tread
CA 1290084 C · Owner: The Yokohama Rubber Co. Ltd. · Inventors: Suzuki, Yukizi; Kikuchi, Yasushi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A rubber composition for a tire tread comprises (a) 25 to 55 p-arts by weight of natural rubber and/or polyisoprene rubber, (b) 5 to 15 parts by weight of halogenated butyl rubber, and (c) 70 to 30 parts by weight of a styrene-butadiene copolymer rubber including 10 to 30 wt. % of bonded styrene units and 25 to 80% of 1,2 vinyl bonds in the butadiene units and having at a molecular terminal or in a chain thereof an atomic group introduced thereinto and represented by the following formula:, (or SH)
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 October 1, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 1, 2008.
- 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.