Gas separation – Two or more separators – Plies or layers of different characteristics or orientation
Reexamination Certificate
2006-10-24
2006-10-24
Smith, Duane (Department: 1724)
Gas separation
Two or more separators
Plies or layers of different characteristics or orientation
C055S320000, C055S487000, C055S498000, C095S287000, C210S338000, C210S348000, C210S497100, C210S493100, C210S787000
Reexamination Certificate
active
07125434
ABSTRACT:
A deep gradient-density filter device capable of effectively filtering a fluid containing a distribution of particles in the range of approximately 25 microns to approximately 0.2 micron at a fluid velocity of at least approximately 100 cm/hr and an initial hydraulic permeability of greater than approximately 10 cm/hr/psi. The deep gradient-density filter device includes several layers of filtration material, each having specific predetermined particle retention properties. In one product embodiment, the deep gradient-density filter device uses “loose” fibrillated cellulose fiber material as a primary filter element. In a method aspect, the deep gradient-density filter device is used for either the secondary clarification of industrial-scale volumes of cultured or fermented protein-containing biopharmaceutical fluids or the primary clarification of pilot-scale volumes.
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Raman Ven Anantha
Royce Jonathan
Tomasko Matthew Alexander
Yavorsky David P.
Millipore Corporation
Millipore Corporation
Pham Minh-Chau T.
Smith Duane
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