US2945842A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfonation of finely divided polymers with sulfonation agents in gas phase
Assignee: Dow Chemical Co
•
Filing: 1956-11-09
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Granted: 1960-07-19
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Expires: 1976-11-09
Abstract
No abstract record available.
Inventors
- 👤 Eichhorn Jacob
- 👤 James M Steinmetz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:31
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/34; C08F8/36; Y; Y10; Y10S; Y10S8/00; Y10S8/09
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A METHOD WHICH COMPRISES CONTACTING SOLID PARTICLES OF A RESINOUS POLYMER OF AN ALKENYLAROMATIC HYDROCARBON, WHICH PARTICLES HAVE DIAMETERS NOT GREATER THAN 25 MICRONS, WITH A BODY OF GAS COMPRISING AT LEAST ONE SULFONATION AGENT SELECTED FROM THE GROUP CONSISTING OF SULFUR TRIOXIDE AND CHLOROSULFONIC ACID AND MAINTAINING SUCH SOLID PARTICLES OF POLYMER IN CONTACT WITH SUCH GAS AT TEMPERATURES IN THE RANGE FROM -40*C. TO 200*C. WHEN THE SULFONATION AGENT IS SULFUR TRIOXIDE AND FROM 30* C. TO 200*C. WHEN THE SULFONATION AGENT IS CHLOROSULFONIC ACID UNTIL THE RESINOUS POLYMER IS APPRECIABLY SULFONATED.
Claim 2
Independent Claim
94 words
A METHOD WHICH COMPRISES CONTACTING SOLID PARTICLES OF A RESINOUS POLYMER OF AN ALKENYLAROMATIC HYDROCARBON, WHICH PARTICLES HAVE DIAMETERS NOT GREATER THAN 25 MICRONS, WITH A BODY OF GAS COMPRISING AT LEAST ONE SULFONATION AGENT SELECTED FROM THE GROUP CONSISTING OF SULFUR TRIOXIDE AND CHLOROSULFONIC ACID AND MAINTAINING SUCH SOLID PARTICLES OF POLYMER IN CONTACT WITH SUCH GAS AT TEMPERATURES IN THE RANGE FROM -40*C. TO 200*C. WHEN THE SULFONATION AGENT IS SULFUR TRIOXIDE AND FROM 30* C. TO 200*C. WHEN THE SULFONATION AGENT IS CHLOROSULFONIC ACID UNTIL THE RESINOUS POLYMER IS APPRECIABLY SULFONATED.
References Cited (Backward Citations)
US1835404A
Cited
US2280802A
Cited
US2235971A
Cited
US2523582A
Cited
US2604461A
Cited
US2746938A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-19 | 1964-01-18 | 1964-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-19 | 1968-01-18 | 1968-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-19 | 1972-01-18 | 1972-07-19 | $7700.00 | Window Closed / Lapsed |