Patent US2733264A successfully refreshed from Google Patents.
US2733264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Agitator
Assignee: —
•
Filing: —
•
Granted: 1956-01-31
•
Expires: 1973-01-31
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:56
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/42; C07C303/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
THE METHOD OF SEPARATING FROM SOLUTION IN SULPHURIC ACID, AROMATIC SULFONIC ACIDS WHICH ARE SOLUBLE IN THE SULPHURIC ACID OF HIGH H2SO4 CONCENTRATION AND WHICH ARE PRECIPITATED THEREFROM UPON DILUTION WITH WATER, COMPRISING THE STEPS OF INTRODUCING THE SULPHURIC ACID SOLUTION OF THE AROMATIC SULFONIC ACID COMPOUND INTO A SEED MIXTURE HAVING THE AROMATIC SULFONIC ACID COMPUND PRECIPITATED THEREIN TO FORM CRYSTALS AND WITH WATER SUFFICIENT TO DILUTE THE SULPHURIC ACID TO THE POINT WHERE THE AMOUNT OF AROMATIC SULFONIC ACIDS PRESENT ARE IN EXCESS OF THAT WHICH IS SOLUBLE IN THE DILUTED SULPHURIC ACID, AND MAINTAINING THE MIXTURE AT A TEMPERATURE ABOVE 25* C. BUT BELOW THE TEMPERATURE AT WHICH THE AROMATIC SULFONIC ACID COMPOUND IS MISCIBLE WITH THE SULPHURIC ACID SOLUTION UNTIL THE AROMATIC SULFONIC ACID COMPOUND CRYSTALLIZES OUT TO FORM A SLURRY OF LIQUID CONSISTENRY.
Claim 2
Independent Claim
138 words
THE METHOD OF SEPARATING FROM SOLUTION IN SULPHURIC ACID, AROMATIC SULFONIC ACIDS WHICH ARE SOLUBLE IN THE SULPHURIC ACID OF HIGH H2SO4 CONCENTRATION AND WHICH ARE PRECIPITATED THEREFROM UPON DILUTION WITH WATER, COMPRISING THE STEPS OF INTRODUCING THE SULPHURIC ACID SOLUTION OF THE AROMATIC SULFONIC ACID COMPOUND INTO A SEED MIXTURE HAVING THE AROMATIC SULFONIC ACID COMPUND PRECIPITATED THEREIN TO FORM CRYSTALS AND WITH WATER SUFFICIENT TO DILUTE THE SULPHURIC ACID TO THE POINT WHERE THE AMOUNT OF AROMATIC SULFONIC ACIDS PRESENT ARE IN EXCESS OF THAT WHICH IS SOLUBLE IN THE DILUTED SULPHURIC ACID, AND MAINTAINING THE MIXTURE AT A TEMPERATURE ABOVE 25* C. BUT BELOW THE TEMPERATURE AT WHICH THE AROMATIC SULFONIC ACID COMPOUND IS MISCIBLE WITH THE SULPHURIC ACID SOLUTION UNTIL THE AROMATIC SULFONIC ACID COMPOUND CRYSTALLIZES OUT TO FORM A SLURRY OF LIQUID CONSISTENRY.
References Cited (Backward Citations)
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Cited
US1671586A
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US2057100A
Cited
US2460865A
Cited
US2463653A
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US2568154A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-30 | 1959-08-01 | 1960-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-30 | 1963-08-01 | 1964-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-30 | 1967-08-01 | 1968-01-31 | $7700.00 | Window Closed / Lapsed |