US2647886A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-soluble heteropolymers from styrene, maleic anhydride and a cross-linking reactant
Assignee: Monsanto Chemicals Ltd
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Filing: 1951-05-15
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Granted: 1953-08-04
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Expires: 1971-05-15
Abstract
No abstract record available.
Inventors
- 👤 Raymond B Seymour
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:50
CPC Classifications
C; C08; C08F; C08F222/00; C08F222/04; C08F222/06; C08F222/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
THE WATER-SOLUBLE ALKALI METAL AND AMMONIUM SALTS OF THE HETEROPOLYMER OF STYRENE AND MALEIC ANHYDRIDE, SAID STYRENE AND MALEIC ANHYDRIDE BEING COMBINED IN SUBSTANTIALLY EQUIMOLECULAR PROPORTIONS, SAID HETROPOLYMER HAVING BEEN FORMED BY INTERPOLYMERIZATION OF SAID STYRENE AND MALEIC ANHYDRIDE IN THE PRESENCE OF FROM 0.001 TO 2.0 MOLE PERCENT, BASED UPON THE MOLES OF STYRENE AND MALEIC ANHYDRIDE OF A COMPOUND POSSESSING ONLY ETHYLENIC POLYMERIZABLE UNSATURATION, AND HAVING AT LEAST 2 POLYMERIZABLE DOUBLE BONDS, BUT NOT IN EXCESS OF 3 POLYMERIZABLE DOUBLE BONDS IN THE MOLECULE, SAID DOUBLE BONDS BEING IN NON-CONJUGATED RELATIONSHIP TO EACH OTHER AND IN THE FURTHER PRESENCE OF AN INERT ORGANIC SOLVENT, THE AMOUNT OF SOLVENT BEING AT LEAST 3 TIMES THE TOTAL WEIGHT OF SAID STYRENE AND MALEIC ANHYDRIDE.
Claim 2
Dependent Claim
124 words
THE WATER-SOLUBLE ALKALI METAL AND AMMONIUM SALTS OF THE HETEROPOLYMER OF STYRENE AND MALEIC ANHYDRIDE, SAID STYRENE AND MALEIC ANHYDRIDE BEING COMBINED IN SUBSTANTIALLY EQUIMOLECULAR PROPORTIONS, SAID HETROPOLYMER HAVING BEEN FORMED BY INTERPOLYMERIZATION OF SAID STYRENE AND MALEIC ANHYDRIDE IN THE PRESENCE OF FROM 0.001 TO 2.0 MOLE PERCENT, BASED UPON THE MOLES OF STYRENE AND MALEIC ANHYDRIDE OF A COMPOUND POSSESSING ONLY ETHYLENIC POLYMERIZABLE UNSATURATION, AND HAVING AT LEAST 2 POLYMERIZABLE DOUBLE BONDS, BUT NOT IN EXCESS OF 3 POLYMERIZABLE DOUBLE BONDS IN THE MOLECULE, SAID DOUBLE BONDS BEING IN NON-CONJUGATED RELATIONSHIP TO EACH OTHER AND IN THE FURTHER PRESENCE OF AN INERT ORGANIC SOLVENT, THE AMOUNT OF SOLVENT BEING AT LEAST 3 TIMES THE TOTAL WEIGHT OF SAID STYRENE AND MALEIC ANHYDRIDE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-03 | 1957-02-02 | 1957-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-03 | 1961-02-02 | 1961-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-03 | 1965-02-02 | 1965-08-04 | $7700.00 | Window Closed / Lapsed |