Drying and gas or vapor contact with solids – Process – Gas or vapor pressure is subatmospheric
Reexamination Certificate
2005-11-29
2005-11-29
Gravini, Stephen (Department: 3749)
Drying and gas or vapor contact with solids
Process
Gas or vapor pressure is subatmospheric
C034S092000
Reexamination Certificate
active
06968631
ABSTRACT:
A freeze dryer having a collector chamber is provided with a sensor for detecting the presence of moisture in the chamber so that the vacuum pump cannot be operated if moisture is present. The refrigeration system can also be deactivated. This precludes moisture from being pulled into the vacuum pump where it will mix with pump oil and shorten the life of the pump. The moisture sensor is also coupled with a warning circuit which advises the operator that the system is inoperable and is capable of displaying the reason for inoperability.
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Bardat et al., Moisture Measurement: A New Method for Monitoring Freeze Drying Cycles, Journal of Parental Science and Technology, vol. 47, No. 6. 1993.
Kuhn Lowell
Schmitz Mark
Xing Tim
Gravini Stephen
Labconco Corporation
Stinson Morrison & Hecker LLP
Wharton J. David
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