US3056765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfonation of alkenylaromatic resins with sulfuric acid
Assignee: Dow Chemical Co
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Filing: 1958-09-02
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Granted: 1962-10-02
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Expires: 1978-09-02
Abstract
No abstract record available.
Inventors
- 👤 Edwin R Cowherd
- 👤 William C Bauman
- 👤 Ralph M Wiley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:45
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/34; C08F8/36; C08F2800/00; C08F2800/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A METHOD FOR THE SULFONATION OF ALKENYLAROMATIC POLYMERS WITH SULFURIC ACID BY THE PROCEDURAL SEQUENCE OF (1) MIXING SULFURIC ACID OF FROM 90 TO 100 PERCENT STRENGTH WITH FINELY DIVIDED DRY SOLID PARTICLES OF A BENZENE-SOLUBLE ADDITION POLYMER OFAN ALKENYLAROMATIC COMPOUND HAVING THE GENERAL FORMULA
Claim 2
Independent Claim
45 words
A METHOD FOR THE SULFONATION OF ALKENYLAROMATIC POLYMERS WITH SULFURIC ACID BY THE PROCEDURAL SEQUENCE OF (1) MIXING SULFURIC ACID OF FROM 90 TO 100 PERCENT STRENGTH WITH FINELY DIVIDED DRY SOLID PARTICLES OF A BENZENE-SOLUBLE ADDITION POLYMER OFAN ALKENYLAROMATIC COMPOUND HAVING THE GENERAL FORMULA
References Cited (Backward Citations)
US2604461A
Cited
US2809960A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-10-01 | 1966-04-02 | 1966-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-01 | 1970-04-02 | 1970-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-01 | 1974-04-02 | 1974-10-02 | $7700.00 | Window Closed / Lapsed |