US2718514A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing salts of sulfonated polystyrene
Assignee: Monsanto Chemicals Ltd
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Filing: 1954-07-29
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Granted: 1955-09-20
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Expires: 1974-07-29
Abstract
No abstract record available.
Inventors
- 👤 Fantl Joel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:56
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A PROCESS FOR PREPARING A FINELY-DIVIDED SUBSTANTIALLY WATER-FREE WATER-SOLUBLE SALT OF SULFONATED POLYSTYRENE WHICH COMPRISES ADDING POLYSTYRENE SULFONIC ACID TO A MIXTURE OF ABOUT 80-99 PARTS BY WEIGHT OF A C1 TO C3 ALIPHATIC MONOHYDROXY ALCOHOL WITH ABOUT 20-1 PARTS BY WEIGHT OF WATER WITH AGITATION AT A TEMPERATURE OF NOT MORE THAN ABOUT 5* C., SAID ALCOHOL-WATER MIXTURE HAVING DISSOLVED THEREIN AN AMOUNT OF A HYDROXIDE SUFFICIENT TO NEUTRALIZE THE POLYSTYRENE SULFONIC ACID, SAID HYDROXIDE BEING TAKEN FROM THE GROUP CONSISTING OF AMMONIUM AND ALKALI METAL HYDROXIDES.
Claim 2
Dependent Claim
88 words
A PROCESS FOR PREPARING A FINELY-DIVIDED SUBSTANTIALLY WATER-FREE WATER-SOLUBLE SALT OF SULFONATED POLYSTYRENE WHICH COMPRISES ADDING POLYSTYRENE SULFONIC ACID TO A MIXTURE OF ABOUT 80-99 PARTS BY WEIGHT OF A C1 TO C3 ALIPHATIC MONOHYDROXY ALCOHOL WITH ABOUT 20-1 PARTS BY WEIGHT OF WATER WITH AGITATION AT A TEMPERATURE OF NOT MORE THAN ABOUT 5* C., SAID ALCOHOL-WATER MIXTURE HAVING DISSOLVED THEREIN AN AMOUNT OF A HYDROXIDE SUFFICIENT TO NEUTRALIZE THE POLYSTYRENE SULFONIC ACID, SAID HYDROXIDE BEING TAKEN FROM THE GROUP CONSISTING OF AMMONIUM AND ALKALI METAL HYDROXIDES.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-09-19 | 1959-03-21 | 1959-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-09-19 | 1963-03-21 | 1963-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-09-19 | 1967-03-21 | 1967-09-20 | $7700.00 | Window Closed / Lapsed |