Expandable styrene polymers containing carbon dioxide as blowing agent
CA 2081934 A1 · Owner: Kaempfer, Knut · Inventors: Schaefer, Anthony; Hahn, Klaus; Witt, Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
O.Z. 0050/42810, Abstract of the Disclosure: The invention relates to expandable styrene polymers containing a) a styrene polymer, b) and at least one carbon dioxide absorber mixed or, copolymerized with the above in an amount of from, 0.01 to 50% by weight based on the sum of a) and, b), and, c) a blowing agent or blowing agent mixture in an amount of from 0.5 to 12% by weight, where the blowing agent or blowing agent mixture comprises, c1) from 10 to 100% by weight of carbon dioxide and c2) from 0 to 90% by weight of at least one further blowing agent. The invention furthermore relates to the styrene polymers containing a carbon dioxide absorber to the, styrene polymer foams obtainable …
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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 2, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 2, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 2, 2014.
- 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.