Process for reducing the density of an extruded foam board of a thermoplastic resin
CA 1292347 C · Owner: Vo, Chau V. · Inventors: Vo, Chau V.; Eschenlauer, Georges
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for reducing the density of an extruded foam board of a thermoplastic resin, The density of an extruded foam board (32) of a thermoplastic resin which board has a thickness of 1 cm or more is reduced by exposing the foam board simultaneously or in sequence to heated air and steam. The density reduction can be carried out in an expansion device (11) which comprises at least one chamber 12 in which simultaneously an atmosphere of steam and heated air is maintained. The chamber (12) is provided with a steam inlet port (14) which is in communication with a steam source (16) and, with an air inlet port (18) which is in communication with an air source (20). The invention allows to …
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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 November 26, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 26, 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.