Expandable styrene polymers of high heat resistance
CA 2136649 A1 · Owner: Brudermueller, Martin · Inventors: Deckers, Andreas; Besecke, Siegmund; Guentherberg, Norbert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Expandable styrene polymers containing a) 0 to 90 % wt. of a styrene polymer different from b) or a styrene copolymer with at least 50 % wt. monopolymerised styrene b) 10 to 100 % wt. of a, styrene/methacrylamide copolymer consisting to the extent of 0.5 to 50 % wt. of at least one monopolymerised N-substituted methacrylamide of general formula (I) in which R1 and R2 are the same or different and are hydrogen, C1 to C15 alkyl C6 to C16, cycloalkyl or C6 to C20 aryl and in the case of constitutents , R1 and R2 with at least 2 carbon atoms at least 2 carbon, atoms may be cross-linked via hetero atoms and c) 1 to 15 % wt. related to the sum of a) and b) or an aliphatic C3 to C9, hydrocarbon …
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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 May 17, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 17, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 17, 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.