Freeze-concentrating apparatus for aqueous solutions, ice pillar producing apparatus, and freeze-concentrating method for aqueous solutions
CA 2294640 A1 · Owner: Matsunaga, Heihachi · Inventors: Sekiya, Eiji; Matsunaga, Heihachi; Shinozaki, Katsuhiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A freeze-concentrating apparatus for cooling an aqueous solution with a cooling cylinder (22) serving as a heat exchanger for cooling and continuously producing a suspension containing particles of ice crystals. The liquid component is separated from the suspension and discharged to bring the particles of ice crystals into a high-density state and the particles of ice , crystals are grown to produce a block of ice particles in a pillar shape. The block of ice particles is cut into ice pillars of a prescribed length and a , concentrated solution is withdrawn from the ice pillars.
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 June 9, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 9, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 9, 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.