Shaped article of composition comprising thermoplastic synthetic resin and cellular material and method of producing same
CA 1236668 A · Owner: Walker (James) & Co Limited · Inventors: Johnson, Ian F.; Goulding, Leslie B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A rail pad or other shaped article in the form of a resiliently compressible extrudate having a textured surface and comprising particles or granules of cork or similar resiliently compressible cellular material substantially homogenously dispersed throughout a polymeric matrix of generally saturated thermoplastic synthetic resin preferably ethylene/vinyl acetate copolymer which has a stiffness, modulus of not more than 1000 MPa and is extrudable under conditions at which the cellular material is not significantly degraded the, extrudate having a Poissons ratio less than that of the matrix. The article may be made by forming a hot dough of the matrix and cellular material, feeding the dough …
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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
- Granted May 17, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 17, 2005.
- 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.