Process for crystallizing melt with adiabatic cooling and apparatus for the same
CA 2106411 C · Owner: Takegami, Keizo · Inventors: Takegami, Keizo; Morita, Minoru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An adiabatic evaporation and cooling of a solvent from a melt of organic chemicals, containing the solvent is conducted in a crystallizer 1. Crystals which are formed by this, operation are removed from the crystallizer 1 and vapor from the crystallizer 1 is, introduced to an absorption condenser 2. A feed solution of the melt is introduced to the, absorption condenser 2 in which it is brought into contact with the vapor to condense the, vapor. The condensate is introduced to the crystallizer 1.
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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 September 17, 1993 and granted August 31, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 17, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 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.