US2860109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cross-linked acrylic anhydride terpolymer cation exchanger
Assignee: Roehm GmbH Darmstadt
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Filing: 1955-09-12
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Granted: 1958-11-11
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Expires: 1975-09-12
Abstract
No abstract record available.
Inventors
- 👤 Abel Margarete
- 👤 Wohnhas Adolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:42
CPC Classifications
C; C08; C08F; C08F8/00; C08F20/00; C08F20/62; C08F8/44; Y; Y10; Y10S; Y10S526/00; Y10S526/909
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
PROCESS FOR PREPARING AN ION EXCHANGE RESIN IN THE FORM OF SUBSTANTIALLY SPHERICAL BEADS HAVING DIAMETERS RANGING BETWEEN ABOUT 0.3 TO 1.0 MM. WHICH COMPRISES HEATING TO A TEMPERATURE OF THE ORDER OF ABOUT 75 TO 80* C., IN A 20% SODIUM CHLORIDE SOLUTION AND IN THE PRESENCE OF ABOUT 0.01 TO 0.1% STARCH AND ABOUT 0.1 TO 1% DIBENZOYL PEROXIDE, A MIXTURE OF ABOUT 80 PARTS BY WEIGHT METHYLACRYLATE, 10 PARTS BY WEIGHT DIVENYIBENZENE AND 10 PARTS BY WEIGHT METHACRYLIC ANHYDRIDE, AND THEREUPON SUBJECTING THE TERPOLYMER THUS OBTAINED TO ALKALINE SAPONIFICATION.
Claim 2
Dependent Claim
92 words
PROCESS FOR PREPARING AN ION EXCHANGE RESIN IN THE FORM OF SUBSTANTIALLY SPHERICAL BEADS HAVING DIAMETERS RANGING BETWEEN ABOUT 0.3 TO 1.0 MM. WHICH COMPRISES HEATING TO A TEMPERATURE OF THE ORDER OF ABOUT 75 TO 80* C., IN A 20% SODIUM CHLORIDE SOLUTION AND IN THE PRESENCE OF ABOUT 0.01 TO 0.1% STARCH AND ABOUT 0.1 TO 1% DIBENZOYL PEROXIDE, A MIXTURE OF ABOUT 80 PARTS BY WEIGHT METHYLACRYLATE, 10 PARTS BY WEIGHT DIVENYIBENZENE AND 10 PARTS BY WEIGHT METHACRYLIC ANHYDRIDE, AND THEREUPON SUBJECTING THE TERPOLYMER THUS OBTAINED TO ALKALINE SAPONIFICATION.
References Cited (Backward Citations)
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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) | 1961-11-10 | 1962-05-12 | 1962-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-10 | 1966-05-12 | 1966-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-10 | 1970-05-12 | 1970-11-11 | $7700.00 | Window Closed / Lapsed |