Method and apparatus for producing foam with reduced thermal conductivity
CA 2110010 A1 · Owner: General Electric Company · Inventors: Jaster, Heinz
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure The thermal conductivity of a foam is, lowered by increasing the cell gas concentration of the foam. A foam extruder having a container for feeding polymer pellets to the extruder and an injector for injecting a blowing agent into the extruder is provided with an inlet port for injecting a high molecular weight gas into the container. The injection of the high molecular weight gas purges air from the container, thereby preventing air from being ingested by the extruder with the polymer pellets. This results in a higher cell gas concentration which lowers the thermal conductivity of the foam. The high molecular weight gas is preferably selected from the group …
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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 November 25, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 25, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 25, 2015.
- 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.