Patent US3336271A successfully refreshed from Google Patents.
US3336271A
Expired / Lapsed
US
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Sulfonation process
Assignee: Dow Chemical Co
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Filing: 1965-01-04
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Granted: 1967-08-15
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Expires: 1985-01-04
Abstract
No abstract record available.
Inventors
- 👤 Thomas E Durocher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:58
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/34; C08F2810/00; C08F2810/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A METHOD FOR SULFONATING AN ALKENYLAROMATIC RESIN WHICH COMPRISES DISPERSING THE RESIN IN CONCENTRATED SULFURIC ACID HAVING A SPECIFIC GRAVITY OF AT LEAST 1.81 AT 20* C. AND INCORPORATING CHLOROSULFONIC ACID INTO THE DISPERSION WHICH IS AT A TEMPERATURE LESS THAN ABOUT 60*C., IN AMOUNT SUFFICIENT TO SULFONATE THE RESIN WHEREBY A WATER DISPERSIBLE ALKENYLAROMATIC RESIN SULFONATE IS OBTAINED.
Claim 2
Independent Claim
59 words
A METHOD FOR SULFONATING AN ALKENYLAROMATIC RESIN WHICH COMPRISES DISPERSING THE RESIN IN CONCENTRATED SULFURIC ACID HAVING A SPECIFIC GRAVITY OF AT LEAST 1.81 AT 20* C. AND INCORPORATING CHLOROSULFONIC ACID INTO THE DISPERSION WHICH IS AT A TEMPERATURE LESS THAN ABOUT 60*C., IN AMOUNT SUFFICIENT TO SULFONATE THE RESIN WHEREBY A WATER DISPERSIBLE ALKENYLAROMATIC RESIN SULFONATE IS OBTAINED.
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) | 1970-08-14 | 1971-02-13 | 1971-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-14 | 1975-02-13 | 1975-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-14 | 1979-02-13 | 1979-08-15 | $7700.00 | Window Closed / Lapsed |