F - Mech Eng,Light,Heat,Weapons – 25 – D
Patent
F - Mech Eng,Light,Heat,Weapons
25
D
F25D 3/11 (2006.01) A23L 3/375 (2006.01) B01J 19/06 (2006.01) F25C 1/00 (2006.01) F26B 5/06 (2006.01) G01N 1/42 (2006.01)
Patent
CA 2134224
The present invention provides methods and devices for freezing drops of liquid reagent solutions in a cryogenic liquid. In one embodiment, the apparatus of the present invention comprises mans for dispensing (22) uniform, precisely measured drops of a liquid reagent (4) and a rotatable carousel (36) positioned below the dispensing means (22). The upper surface of the carousel has a plurality of trays (58) each containing a cryogenic liquid, typically liquid nitrogen, for receiving the drops of liquid reagent. An alternative embodiment of the present invention comprises a tank (66) comprising a cryogenic liquid for receiving the drops of liquid reagent. The tank has a heat source (70) for slightly heating a portion of the cryogenic liquid such that a convection current in the cryogenic liquid provide mild agitation of the liquid and prevent aggregation of the frozen drops.
Alvarado Anthony
Bhayani Bhaskar
Buhl Steven N.
Chatterjee Bikash K.
Smith Gary L.
Abaxis Inc.
Fetherstonhaugh & Co.
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