US Patent No: 6,176,121
Number of patents in Portfolio can not be more than 2000
Method of determining residual moisture content during secondary drying in a freeze-drying process
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Jan 23, 2001
Issued date -
Aug 4, 1997
filing date -
08/875,708
serial no -
In Force
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Abstract
A method for determining the residual moisture content during secondary drying in the dry product of a freeze-drying process is disclosed. In order to determine the residual moisture content without interruption of the drying process is suggested that the desorption rate is measured at certain intervals (for example 10 minutes) during the secondary drying phase. A computer calculates from two or several of these measured values the time at which a desorption rate would be reached (desorption rate zero point) which would alter the desired residual moisture by only a tolerably small amount. The respective residual moisture is determined by the computer by chronological integration of desorption rates from zero point until the moment of measurement taking.
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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 4,506,994 Dew point measurement and time trend analysis | 6 | 1982 | |
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| 4,606,650 Microwave, a closed vessel and methods of determining volatile material content | 22 | 1984 | |
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| 4,889,201 Drying balance with evaluation circuit for determining the end of the drying | 15 | 1989 | |
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| 4,709,579 Measurement of moisture content | 12 | 1985 | |
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| 4,561,191 Method and apparatus for continuous freeze drying | 7 | 1985 | |
| 5,280,678 Method and apparatus for monitoring the processing of a material | 5 | 1992 | |