Carrying out batchwise distillative separations
CA 2101461 A1 · Owner: Basf Aktiengesellschaft · Inventors: Kaibel, Gerd
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Batchwise distillative separations are carried out by means of a distillation still with an attached distillation column by a process in which the separation of individual fractions is effected in at least two different steps where, in the, first step, a portion is removed via the top or as a side product in a purity which is lower than the required final purity of this fraction and this portion is temporarily stored in one or more containers and in a, further step, this portion is removed from the container or the containers and fed to the column in the middle region and at the same the product is obtained in the required final purity at the top of the column.
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 July 28, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 28, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 28, 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.