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Patent US3320218A successfully refreshed from Google Patents.
US3320218A
Expired / Lapsed
US
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Cross-linked sulfonated aliphatic hydrocarbon polymers
Assignee: Dow Chemical Co
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Filing: 1963-04-05
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Granted: 1967-05-16
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Expires: 1983-04-05
Abstract
No abstract record available.
Inventors
- 👤 Charles A Levine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:09
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
PROCESS FOR PREPARING A SULFONATED HYDROCARBON POLYMER CONTAINING SULFONE CROSS-LINKAGES BY SWELLING A SOLID ALIPHATIC HYDROCARBON POLYMER WITH A LIQUID HALOLEN POLYMER WITH AN INORGANIC SULFUR-CONTAINING ACIDIC SULFONATING AGENT, RECOVERING A SULFONATED POLYMER HAVING PREDOMINATELY SULFONIC ACID GROUPS ON THE POLYMER CHAINS THEREOF, AND HEATING AT A TEMPERATURE IN THE RANGE FROM ABOUT 60* TO ABOUT 400*C. SUCH SULFONATED POLYMER CAUSING FURTHER REACTION OF SOME OF THE SULFONIC ACID GROUPS AND FORMING SULFONE CROSS-LINKAGES IN THE RESULTING PRODUCT.
Claim 2
Dependent Claim
78 words
PROCESS FOR PREPARING A SULFONATED HYDROCARBON POLYMER CONTAINING SULFONE CROSS-LINKAGES BY SWELLING A SOLID ALIPHATIC HYDROCARBON POLYMER WITH A LIQUID HALOLEN POLYMER WITH AN INORGANIC SULFUR-CONTAINING ACIDIC SULFONATING AGENT, RECOVERING A SULFONATED POLYMER HAVING PREDOMINATELY SULFONIC ACID GROUPS ON THE POLYMER CHAINS THEREOF, AND HEATING AT A TEMPERATURE IN THE RANGE FROM ABOUT 60* TO ABOUT 400*C. SUCH SULFONATED POLYMER CAUSING FURTHER REACTION OF SOME OF THE SULFONIC ACID GROUPS AND FORMING SULFONE CROSS-LINKAGES IN THE RESULTING PRODUCT.
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) | 1970-05-15 | 1970-11-14 | 1971-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-15 | 1974-11-14 | 1975-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-15 | 1978-11-14 | 1979-05-16 | $7700.00 | Window Closed / Lapsed |