Recyclable protective and sealing composition based on a compound mixture of high molecular weight, partly crystalline copolyesters
CA 2091875 A1 · Owner: Huls Aktiengesellschaft · Inventors: Bruning, Klaus; Hahn, Siegfried; Vollkommer, Norbert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Sealing compositions comprising 60 to 98 % by weight of a high molecular weight, partly crystalline copolyester or mixture of such copolyesters, 2 to 40 % by weight of an inorganic or polymeric filler and 0 to 10.% by weight of additives are disclosed The copolyesters are prepared by polycondensation of 40 to 80 mol % of terephthalic acid, 20 to 60 mol % of at least one dicarboxylic acid of the formula HOOC-R-COOH wherein R is, for example, an aliphatic radical having 2 to 10 carbon atoms and if appropriate, 0 to 3 mol % of trimesic acid or trimellitic anhydride with 60 to 100 mol % of at least one diol having the formula HO-R'-OH, wherein R ' is an aliphatic radical having 2 to 12 C atoms, …
Read the whole patent
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 March 17, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 17, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 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.