Patent US2533211A successfully refreshed from Google Patents.
US2533211A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for stjlfonating
Assignee: —
•
Filing: —
•
Granted: 1950-12-12
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Expires: 1967-12-12
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:33
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/34; C08F8/36; C08L; C08L25/00; C08L25/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A PROCESS WHICH COMPRISES SULFONATING SOLID POLYMERS OF STYRENE BY REACTING SAID POLYMERS AT TEMPERATURES FROM -15*C. TO +5*C. IN A CHLORINATED, ALIPHATIC, ORGANIC SOLVENT WITH A COMPLEX OF SULFUR TRIOXIDE AND DIOXANE CONTAINING FROM 0.5 TO 2 MOLS OF DIOXANE PER MOL OF SULFUR TRIOXIDE.
Claim 2
Dependent Claim
46 words
A PROCESS WHICH COMPRISES SULFONATING SOLID POLYMERS OF STYRENE BY REACTING SAID POLYMERS AT TEMPERATURES FROM -15*C. TO +5*C. IN A CHLORINATED, ALIPHATIC, ORGANIC SOLVENT WITH A COMPLEX OF SULFUR TRIOXIDE AND DIOXANE CONTAINING FROM 0.5 TO 2 MOLS OF DIOXANE PER MOL OF SULFUR TRIOXIDE.
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) | 1953-12-11 | 1954-06-12 | 1954-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-11 | 1958-06-12 | 1958-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-11 | 1962-06-12 | 1962-12-12 | $7700.00 | Window Closed / Lapsed |