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| Number | Title | Issue Date |
| 6117317 | Chromatographic column and valve with movable valve sleeve A chromatography column having at least one central slurry valve positioned at either the top cell assembly and/or the bottom cell assembly. The central slurry valves have a pneumatically actuated valve sleeve which can be shifted to create three differen... | 09/12/2000 |
| 5833860 | Centrifugal adsorptive sample preparation device and method Adsorptive sample preparation device and method effective for concentrating, desalting and/or purifying biomolecules. An adsorptive membrane is used to bind biomolecules, which biomolecules can then be eluted with a suitable desorption agent. In a preferr... | 11/10/1998 |
| 5783087 | Method and apparatus for isolation and purification of immune complexes A system and method for isolating and purifying complexes of biologically active compounds. The inventive system and method utilize a centrifugal filtration device employing a membrane having ligands that preferentially bind a biologically active compound... | 07/21/1998 |
| 5772899 | Fluid dispensing system having independently operated pumps A fluid dispensing system is provided which has first diaphragm pump means, a filter connected to receive the discharge of said first pump, and accumulator/second diaphragm pump means connected to receive the discharge of said filter. Hydraulic fluids pum... | 06/30/1998 |
| 5671928 | Seal for chromatography column having ridges An annular seal for chromatography columns adapted for radial sealing with an inner cylindrical surface, having a compressive surface disposed on the inner annular edge of the seal, and a sealing surface disposed on the outer annular edge of the seal, whe... | 09/30/1997 |
| 5629084 | Porous composite membrane and process A composite porous membrane is provided which comprises a porous membrane substrate having an average pore size between 0.01 and 10 microns formed of a first polymer which is coated over its entire surface with a crosslinked second polymer. The second pol... | 05/13/1997 |
| 5603900 | Vacuum filter device A vacuum filter device is disclosed which includes a filter body which is adapted to receive in fluid-fight, sealed relationship a pair of closed containers for solutions to be filtered by a membrane filter positioned within the filter body. A vacuum port... | 02/18/1997 |
| 5599447 | Manifold apparatus for tangential flow filtration apparatus A manifold segment is provided for tangential flow filtration apparatus. The manifold segment includes a fluid feed conduit, a retentate conduit, a filtrate inlet and a filtrate outlet. An adaptor manifold is provided which directs filtrate from the manif... | 02/04/1997 |
| 5597486 | Membrane filtration with optimized addition of second liquid to maximize flux A membrane-based tangential flow filtration system is disclosed which includes optimized performance capabilities by taking into account the variety of flux and component passage behavior occurring during filtration processing. The system maximizes the re... | 01/28/1997 |
| 5583282 | Differential gas sensing in-line monitoring system An in-line detector system and method for real-time detection of impurity concentration in a flowing gas stream. In a specific aspect, the system may comprise an in-line monitoring system for determining the calibrated concentration of an impurity species... | 12/10/1996 |
| 5581017 | Integrity test for porous structures using acoustic emission A rapid, highly sensitive determination, in-situ, of the integrity and/or pore size distribution of a porous membrane structure (e.g. a pleated membrane filter cartridge) is disclosed. The identification of the integrity and/or pore size characteristics i... | 12/03/1996 |
| 5554536 | Biological analysis device having improved contamination prevention A device for conducting biological analysis, such as cell culture, is disclosed having improved contamination prevention features. In a preferred embodiment, a microwell membrane plate for cell analysis is adapted to be inserted into a shallow rectangular... | 09/10/1996 |
| 5554414 | Process for forming membrane having a hydrophobic fluoropolymer surface A composite porous article is formed from a porous polymeric substrate having its entire surface modified with a cross-linked polymer which results in a hydrophobic and oleophobic surface. The composite retains substantially all of the other original prop... | 09/10/1996 |
| 5531971 | Process for purifying semiconductor process gases to remove lewis acid and oxidant impurities therefrom Scavenger compositions useful for purifying process gas streams, such as process gas streams, such as hydrogen, nitrogen, noble gases, diborane, and hydride gases from Groups IVA-VIA of the Periodic Table, such as arsine, phosphine, silane, germane, hydro... | 07/02/1996 |
| 5531899 | Ion exchange polyethylene membrane and process A composite ultrahigh molecular weight polyethylene microporous membrane is provided having cation exchange capacity. The membrane is useful for removing metal ions from acidic aqueous solutions.... | 07/02/1996 |
| 5527672 | Hydrophobic coated membranes A portion of a hydrophobic membrane, having an unknown concentration of a first molecule in a sample bound to its surface, is incubated with a second molecule that selectively binds to the first molecule so as to allow determination of its concentration. ... | 06/18/1996 |
| 5522991 | Cellulosic ultrafiltration membrane A cellulosic ultrafiltration membrane is provided having a microporous base resistant substrate and an ultrafiltration layer form of a cellulose ester or cellulose.... | 06/04/1996 |
