Dialysis membrane and its use
Abstract
Abstract SUBJECTING A DIALYZABLE LIQUID (SUCH AS BLOOD) TO DIALYSIS (HEMODIALYSIS) BY PROVIDING AN ANISOTROPIS MICROPOROUS POLYSULFONE POLYMER MEMBRANE HAVING A BARRIER LAYER AT A SURFACE THEREOF AND A MORE POROUS SUPPORT LAYER INTEGRAL WITH THE BARRIER LAYER, THE BARRIER AND SUPPORT LAYERS BEING A CONTINUOUS UNINTERRUPTED POLYMER PHASE, WHICH MEMBRANE HAS A DIALYTIC RESISTANCE TO SODIUM CHLORIDE LESS THAN ABOUT 50 MIN./CM. AND A TOTAL ULTRAFILTRATION FLUX BETWEEN ABOUT 3X10**-5 AND 1X10**-6 ML./(CM.2 X MIN. X MM.HG), CONTACTING THE BARRIER LAYER SURFACE OF THIS MEMBRANE WITH THE DIALYZABLE LIQUID, AND CONTACTING THE OTHER SIDE OF THE MEMBRANE WITH A SOLVENT FOR THE DIALYZABLE COMPONENTS OF SUCH LIQUID.
Inventors
- 👤 Robert A Cross
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |