US2683137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of water-dispersible sulfonates of alkenyl aromatic resins
Assignee: Dow Chemical Co
•
Filing: 1951-06-11
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Granted: 1954-07-06
•
Expires: 1971-06-11
Abstract
No abstract record available.
Inventors
- 👤 Harold H Roth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:14
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/34; C08F8/36; C08F2800/00; C08F2800/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
A METHOD OF SULPHONATING AN ALKENYL AROMATIC RESIN, CONSISTING OF A BENZENE-SOLUBLE POLYMER CONTAINING, IN CHEMICALLY COMBINED FORM, AT LEAST 20 PER CENT BY WEIGHT OF AT LEAST ONE ALKENYL AROMATIC COMPOUND HAVING THE GENERAL FORMULA:
Claim 2
Independent Claim
36 words
A METHOD OF SULPHONATING AN ALKENYL AROMATIC RESIN, CONSISTING OF A BENZENE-SOLUBLE POLYMER CONTAINING, IN CHEMICALLY COMBINED FORM, AT LEAST 20 PER CENT BY WEIGHT OF AT LEAST ONE ALKENYL AROMATIC COMPOUND HAVING THE GENERAL FORMULA:
References Cited (Backward Citations)
DE580366C
Cited
US2031929A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-05 | 1958-01-04 | 1958-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-05 | 1962-01-04 | 1962-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-05 | 1966-01-04 | 1966-07-06 | $7700.00 | Window Closed / Lapsed |