Flow enhancer for petroleum middle distillates
CA 2288708 A1 · Owner: Dralle-Voss, Gabriele · Inventors: Schornick, Gunnar; Dralle-Voss, Gabriele; Wenderoth, Bernd
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a copolymer from the monomers of constituents A to C as indicated below and optionally D, the total weight of which amounts to 100 mol %: a) 20 to 80 mol % of at least one ethylenically unsaturated dicarboxylic acid or an anhydride, ester and/or amide thereof as constituent A; b) 1 to 79 mol % of at least one diketene of general formula (I) wherein , R1 and R2 independently means hydrogen or C1-30-alkyl as constituent B; c) 1 to 79 mol % of at least one vinyl ester (meth)acrylic acid alkyl ester, (meth)acrylnitrile or mixtures thereof as constituent C and d) 0 to less than 0.5 mol %, or when at least 20 mol % of constituent C is provided 0 to 20 mol , % of at …
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 May 7, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 7, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 7, 2020.
- 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.