Process and device for determining the end of a primary stage of freeze drying
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United States of America Patent
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-
Nov 1, 1988
Grant Date -
N/A
app pub date -
Nov 30, 1987
filing date -
Nov 30, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A tray-type freeze drying device determines the end of a first stage of a freeze drying process by regularly and drastically reducing the pressure surrounding the product being freeze dried. No decrease in product temperature during the reduction in pressure indicates the completion of the sublimation of water from the product and the end of the first stage of drying. A decrease in product temperature during the drastic reduction in pressure indicates the need to continue the sublimation procedure and the first stage of drying.
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