Patent US3790318A successfully refreshed from Google Patents.
US2810745A
Expired / Lapsed
US
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Purifying mahogany sulfonic acids
Assignee: Sunoco Inc
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Filing: 1955-07-05
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Granted: 1957-10-22
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Expires: 1975-07-05
Abstract
No abstract record available.
Inventors
- 👤 John J Wolski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:58
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/42; C07C303/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
THE METHOD OF REMOVING INORGANIC ACIDIC IMPURITIES FROM MAHOGANY SULFONIC ACIDS WHICH COMPRISES: CONTACTING MAHOGANY SULFONIC ACIDS CONTAINING INORGANIC ACIDIC IMPURITIES WITH AN ANHYDROUS ALKALI EARTH METAL NEUTRALIZING AGENT SELECTED FROM THE GROUP CONSISTING OF ALKALINE EARTH METAL OXIDES, HYDROXIDES, AND CARBONATES AT CONDITIONS WHEREBY THE ACIDIC IMPURITIES SELECTIVELY REACT WITH THE NEUTRALIZING AGENT TO FORM SOLID REACTION PRODUCTS, AND SEPARATING MAHOGANY SULFONIC ACIDS HAVING A REDUCED CONTENT OF INORGANIC IMPURITIES FROM THE SOLID PRODUCTS OF THE NEUTRALIZATION.
Claim 2
Independent Claim
78 words
THE METHOD OF REMOVING INORGANIC ACIDIC IMPURITIES FROM MAHOGANY SULFONIC ACIDS WHICH COMPRISES: CONTACTING MAHOGANY SULFONIC ACIDS CONTAINING INORGANIC ACIDIC IMPURITIES WITH AN ANHYDROUS ALKALI EARTH METAL NEUTRALIZING AGENT SELECTED FROM THE GROUP CONSISTING OF ALKALINE EARTH METAL OXIDES, HYDROXIDES, AND CARBONATES AT CONDITIONS WHEREBY THE ACIDIC IMPURITIES SELECTIVELY REACT WITH THE NEUTRALIZING AGENT TO FORM SOLID REACTION PRODUCTS, AND SEPARATING MAHOGANY SULFONIC ACIDS HAVING A REDUCED CONTENT OF INORGANIC IMPURITIES FROM THE SOLID PRODUCTS OF THE NEUTRALIZATION.
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) | 1960-10-21 | 1961-04-22 | 1961-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-21 | 1965-04-22 | 1965-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-21 | 1969-04-22 | 1969-10-22 | $7700.00 | Window Closed / Lapsed |