US2914453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification and recovery of normally solid polymers
Assignee: Standard Oil Co
•
Filing: 1956-11-19
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Granted: 1959-11-24
•
Expires: 1976-11-19
Abstract
No abstract record available.
Inventors
- 👤 Arnold N Wennerberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:12
CPC Classifications
B; B03; B03C; B03C5/00; B03C5/005; C; C08; C08F; C08F6/00; C08F6/02; Y; Y10; Y10S; Y10S159/00; Y10S159/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
THE METHOD OF EFFECTING CLARIFICATION OF A SOLUTION OF A HIGH-MOLECULAR-WEIGHT, SOLID POLYOLEFIN IN A DIELECTRIC SOLVENT WHICH SOLUTION CONTAINS SOLID CATALYST PARTICLES AND COLOR BODIES, WHICH METHOD COMPRISES FLOWING THE SOLUTION THROUGH AN INHOMOGENEOUS ELECTRICAL FIELD BETWEEN ELECTRODES HAVING A RATIO OF SURFACE AREAS GREATER THAN 10 AND WITH A FIELD STRENGTH IN THE RANGE OF 2-TO 50 KILOVOLTS PER CENTIMETER OF DISTANCE BETWEEN ELECTRODES WHEREBY SOLIDS ARE REMOVED FROM SAID SOLUTION BY DIELECTROPHORESIS AND PERCOLATING SAID SOLUTION THROUGH A MASS OF SOLID ADSORPTIVE MATERIAL SELECTED FROM THE CLASS CONSISTING OF CLAY, SILICIA GEL, FULLER''S EARTH, BAUXITE AND ALUMINA FOR REMOVING COLOR BODIES FROM SAID SOLUTION SAID PERCOLATION BEING LIKEWISE EFFECTED IN AN INHOMOGENEOUS ELECTRICAL FIELD BETWEEN ELECTRODES HAVING A RATIO OF SURFACE AREAS GREATER THAN 10 AND WITH A FIELD STRENGTH IN THE RANGE OF 2 TO 50 KILOVOLTS PER CENTIMETER OF DISTANCE BETWEEN ELECTRODES.
Claim 2
Independent Claim
147 words
THE METHOD OF EFFECTING CLARIFICATION OF A SOLUTION OF A HIGH-MOLECULAR-WEIGHT, SOLID POLYOLEFIN IN A DIELECTRIC SOLVENT WHICH SOLUTION CONTAINS SOLID CATALYST PARTICLES AND COLOR BODIES, WHICH METHOD COMPRISES FLOWING THE SOLUTION THROUGH AN INHOMOGENEOUS ELECTRICAL FIELD BETWEEN ELECTRODES HAVING A RATIO OF SURFACE AREAS GREATER THAN 10 AND WITH A FIELD STRENGTH IN THE RANGE OF 2-TO 50 KILOVOLTS PER CENTIMETER OF DISTANCE BETWEEN ELECTRODES WHEREBY SOLIDS ARE REMOVED FROM SAID SOLUTION BY DIELECTROPHORESIS AND PERCOLATING SAID SOLUTION THROUGH A MASS OF SOLID ADSORPTIVE MATERIAL SELECTED FROM THE CLASS CONSISTING OF CLAY, SILICIA GEL, FULLER''S EARTH, BAUXITE AND ALUMINA FOR REMOVING COLOR BODIES FROM SAID SOLUTION SAID PERCOLATION BEING LIKEWISE EFFECTED IN AN INHOMOGENEOUS ELECTRICAL FIELD BETWEEN ELECTRODES HAVING A RATIO OF SURFACE AREAS GREATER THAN 10 AND WITH A FIELD STRENGTH IN THE RANGE OF 2 TO 50 KILOVOLTS PER CENTIMETER OF DISTANCE BETWEEN ELECTRODES.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-23 | 1963-05-25 | 1963-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-23 | 1967-05-25 | 1967-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-23 | 1971-05-25 | 1971-11-24 | $7700.00 | Window Closed / Lapsed |