Method for carrying out polycondensation reactions
CA 2281745 A1 · Owner: Wagner, Paul · Inventors: Heise, Klaus-Peter; Menzel, Thomas; Weinschenck, Jorgen
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 method for carrying out polycondensation reactions according to which the polycondensation of a monomeric educt is carried out with an external supply of heat in an at least two-stage reactor combination comprising a pre-reactor and a high-viscosity reactor the resulting low-, molecular cleavage products being removed by evaporation. In the pre-reactor the reaction product is concentrated into a viscous starting product and said , viscous starting product then fully reacted into a polycondensation product in the high-viscosity reactor under addition of thermal and mechanical energy over a period of between 20 seconds and 60 minutes.
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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 February 10, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 10, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 10, 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.