Refrigeration – Article moving means – Rotary about fixed axis – e.g. – rotary shelf or scraper
Patent
1992-04-24
1994-01-04
Capossela, Ronald C.
Refrigeration
Article moving means
Rotary about fixed axis, e.g., rotary shelf or scraper
2 78, 2374, F25D 2502
Patent
active
052750167
ABSTRACT:
The present invention provides methods and devices for freezing drops of liquid reagent solution in a cryogenic liquid. In one embodiment, the apparatus of the present invention comprises means for dispensing uniform, precisely measured drops of a liquid reagent and a rotatable carousel positioned below the dispensing means. The upper surface of the carousel has a plurality of trays 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 comprising a cryogenic liquid for receiving the drops of liquid reagent. The tank has a heat source for slightly heating a portion of the cryogenic liquid such that a convection current in the cryogenic liquid is created. The convection currents in the cryogenic liquid provide mild agitation of the liquid and prevent aggregation of the frozen drops.
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Alvarado Anthony
Bhayani Bhaskar
Buhl Steven N.
Chatterjee Bikash K.
Smith Gary L.
Abaxis, Inc.
Capossela Ronald C.
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