Rubber compositions
CA 1333310 C · Owner: Sumitomo Chemical Company, Limited · Inventors: Iketani, Kohichi; Tanimoto, Yoshio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a rubber composition which comprises 100 parts by weight of ethylene. .alpha.-olefin.non-conjugated diene copolymer rubber 5 - 40 parts, by weight of solid diene rubber and 4 - 15 parts by weight of sulfur, the butadiene content of said solid diene rubber being 50 % by weight or more, the butadiene portions of said solid diene rubber having 40 % or more of 1,2 bonds based on all the bonds of said portion and the ratio of, weight-average molecular weight to number-average molecular weight being 2 or less. The rubber composition is a vulcanized rubber excellent in properties such as hardness and stength.
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 29, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 29, 2011.
- 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.