Tunnel freezer
CA 2004459 A1 · Owner: Summers, John Vincent · Inventors: Miller, Jeremy Paul; Summers, John Vincent
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A tunnel freezer (1) comprises an elongate tunnel (2) which is inclined to the horizontal and which can be rotated about its longitudinal axis (X-X). The inside of the tunnel (2) is provided with a weir (6) which retains a pool (7) of liquid nitrogen between the weir (6) and the upper end (5) of the tunnel (2). Particles (12) to be frozen are introduced into the tunnel (2) on a conveyor (83 and drop into the pool (7) where they freeze substantially without aggregation. Rotation of the tunnel (2) carries the particles out of the liquid nitrogen and through the remainder of the tunnel (2) to the outlet end (13) of the tunnel (2). The frozen particles and the nitrogen vapour from the tunnel …
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 December 1, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 1, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 1, 2011.
- 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.