US3275548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of dissolved substances from aqueous dispersions
Assignee: Dow Chemical Co
•
Filing: 1963-08-14
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Granted: 1966-09-27
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Expires: 1983-08-14
Abstract
No abstract record available.
Inventors
- 👤 Harold A Walters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:11
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/28; C08J9/286; B; B01; B01D; B01D15/00; C08J2325/00; C08J2325/02; C08J2325/04; C08J2325/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A METHOD OF SEPARATING DISPERSED ORGANIC MATERAIL HAVING A MOLECULAR DIMENSION OF LESS THAN ABOUT 300 ANGSTROMS FROM AN AQUEOUS DISPERSION COMPRISING CONACTING THE AQUEOUS DISPERSION WITH A FINELY DIVIDED ADSORBENT COMPRISING A PLURALITY OF SYNTHETIC RESINOUS SPHERE-LIKE PARTICLES, THE SYNTHETIC RESINOUS PARTICLES HAVING A PLURALITY OF PORES COMMUNICATING WITH THE SURFACE THEREOF THE PORES HAVING DIAMETERS RANGING UP TO ABOUT 300 ANGSTOMS THE SYNTHETIC RESINOUS PARTICLES BEING PREPARED BY THE COPOLYMERIZATION OF 5 MOLE PERCENT DIVINYLBENZENE WITH 95 MOLE PERCENT STYRENE IN THE PRESENCE OF A SOLVENT EQUAL TO TWICE THE TOTAL VOLUME OF THE DIVINYLBENZENE AND STYRENE, THE SOLVENT BEING A MIXTURE OF 50 PARTS OF TOLUENE AND 50 PARTS OF OCTANE, TO FORM A RIGID CROSS-LINKED SOLID AND SUBSEQUENTLY SEPARATING THE RESINOUS PARTICLES FROM THE AQUEOUS DISPERSION.
Claim 2
Independent Claim
130 words
A METHOD OF SEPARATING DISPERSED ORGANIC MATERAIL HAVING A MOLECULAR DIMENSION OF LESS THAN ABOUT 300 ANGSTROMS FROM AN AQUEOUS DISPERSION COMPRISING CONACTING THE AQUEOUS DISPERSION WITH A FINELY DIVIDED ADSORBENT COMPRISING A PLURALITY OF SYNTHETIC RESINOUS SPHERE-LIKE PARTICLES, THE SYNTHETIC RESINOUS PARTICLES HAVING A PLURALITY OF PORES COMMUNICATING WITH THE SURFACE THEREOF THE PORES HAVING DIAMETERS RANGING UP TO ABOUT 300 ANGSTOMS THE SYNTHETIC RESINOUS PARTICLES BEING PREPARED BY THE COPOLYMERIZATION OF 5 MOLE PERCENT DIVINYLBENZENE WITH 95 MOLE PERCENT STYRENE IN THE PRESENCE OF A SOLVENT EQUAL TO TWICE THE TOTAL VOLUME OF THE DIVINYLBENZENE AND STYRENE, THE SOLVENT BEING A MIXTURE OF 50 PARTS OF TOLUENE AND 50 PARTS OF OCTANE, TO FORM A RIGID CROSS-LINKED SOLID AND SUBSEQUENTLY SEPARATING THE RESINOUS PARTICLES FROM THE AQUEOUS DISPERSION.
References Cited (Backward Citations)
US3147214A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-26 | 1970-03-28 | 1970-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-26 | 1974-03-28 | 1974-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-26 | 1978-03-28 | 1978-09-27 | $7700.00 | Window Closed / Lapsed |