US3310481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of residual monomeric sulfonates from polymerizates thereof
Assignee: Dow Chemical Co
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Filing: 1962-09-10
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Granted: 1967-03-21
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Expires: 1982-09-10
Abstract
No abstract record available.
Inventors
- 👤 Richard A Mock
- 👤 William N Vanderkooi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:36
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/42; B01D61/44; C; C08; C08F; C08F6/00; C08F6/001; C08F6/003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
A METHOD WHICH COMPRISES PASSING AN AQUEOUS DISPERSION OF A POLYVINYL ORGANIC SULFONATE CONTAINING RESIDUAL AMOUNTS OF VINYL ORGANIC SULFONATE THROUGH THE PURIFICATION CHAMBER OF AT LEAST ONE ELECTRODIALYSIS CELL, SAID PURIFICATION CHAMBER HAVING ONE WALL OF A CATION PERMSELECTIVE MEMBRANE AND ANOTHER WALL OF AN ANION PERMSELECTIVE MEMBRANE INWARDLY SHIELDED ON THE PURIFICATION CHAMBER SIDE WITH AN ION PERMEABLE NON-IONIC MEMBRANE, EACH OF SAID WALLS BEING IN CONTACT WITH ADJACENT BUT ELECTRICALLY SEPARATE VOLUME OF AN AQUEOUS ELECTROLYTE, THE ELECTROLYTE IN CONTACT WITH THE CATION PERMSELECTIVE MEMBRANE BEING IN ELECTRICAL COMMUNICATION WITH A CATHODE AND THE AQUEOUS ELECTROLYTE IN CONTACT WITH THE ANION PERMSELECTIVE MEMBRANE BEING IN ELECTRICAL COMMUNICATION WITH AN ANODE AND, WHILE PASSING THE DISPERSION THROUGH THE PURIFICATION CHAMBER, IMPRESSING A DIRECT CURRENT UNIDIRECTIONALLY THROUGH THE ELECTRODIALYSIS CELL, WHEREBY MONOMER IS REMOVED FROM THE AQUEOUS POLYMERIZATE.
Claim 2
Independent Claim
139 words
A METHOD WHICH COMPRISES PASSING AN AQUEOUS DISPERSION OF A POLYVINYL ORGANIC SULFONATE CONTAINING RESIDUAL AMOUNTS OF VINYL ORGANIC SULFONATE THROUGH THE PURIFICATION CHAMBER OF AT LEAST ONE ELECTRODIALYSIS CELL, SAID PURIFICATION CHAMBER HAVING ONE WALL OF A CATION PERMSELECTIVE MEMBRANE AND ANOTHER WALL OF AN ANION PERMSELECTIVE MEMBRANE INWARDLY SHIELDED ON THE PURIFICATION CHAMBER SIDE WITH AN ION PERMEABLE NON-IONIC MEMBRANE, EACH OF SAID WALLS BEING IN CONTACT WITH ADJACENT BUT ELECTRICALLY SEPARATE VOLUME OF AN AQUEOUS ELECTROLYTE, THE ELECTROLYTE IN CONTACT WITH THE CATION PERMSELECTIVE MEMBRANE BEING IN ELECTRICAL COMMUNICATION WITH A CATHODE AND THE AQUEOUS ELECTROLYTE IN CONTACT WITH THE ANION PERMSELECTIVE MEMBRANE BEING IN ELECTRICAL COMMUNICATION WITH AN ANODE AND, WHILE PASSING THE DISPERSION THROUGH THE PURIFICATION CHAMBER, IMPRESSING A DIRECT CURRENT UNIDIRECTIONALLY THROUGH THE ELECTRODIALYSIS CELL, WHEREBY MONOMER IS REMOVED FROM THE AQUEOUS POLYMERIZATE.
References Cited (Backward Citations)
US2815320A
Cited
US2758965A
Cited
US2897130A
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US2970098A
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US2981671A
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GB877239A
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US3017338A
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US3003940A
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US3230162A
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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) | 1970-03-20 | 1970-09-19 | 1971-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-20 | 1974-09-19 | 1975-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-20 | 1978-09-19 | 1979-03-21 | $7700.00 | Window Closed / Lapsed |