Process of bonding aromatic polyamide fibers to rubber compounds
CA 2006403 C · Owner: Hata, Katsuhiko · Inventors: Fujiwara, Akinori; Hata, Katsuhiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process of bonding aromatic polyamide fibers to rubber compounds is disclosed, which comprises: the first step of treating fibers with an aqueous mixture comprising a resorcinol/formalin resin and a latex of a polymer containing halogens in amounts of not less than 45 % by weight based on the polymer; the second step of treating the fibers with an aqueous adhesive composition comprising a resorcinol/formalin resin and a latex of an adhesive rubber which is compatible with the rubber in the rubber compound; and the third step of placing the fibers in close contact with the rubber compound and vulcanizing the rubber together with the fibers. A second process is further disclosed wherein in …
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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
- Filed December 21, 1989 and granted May 11, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 21, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 21, 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.