US2568154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystallization of sodium naphthalene beta sulfonates
Assignee: Wyeth Holdings LLC
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Filing: 1946-12-03
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Granted: 1951-09-18
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Expires: 1966-12-03
Abstract
No abstract record available.
Inventors
- 👤 Hill Alfred Garrett
- 👤 Shirley I Gale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:23
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/42; C07C303/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
AS A NEW AND IMPROVED METHOD OF RECOVERING CRYSTALLINE SODIUM NAPHTHALENE BETA-SULFONATE FROM SUPERSATURATED AQUEOUS SOLUTIONS OF THE SAME, THE IMPROVED METHOD WHICH COMPRISES INCORPORATING A MINOR PROPORTION OF A SURFACE-ACTIVE AGENT IN SAID SOLUTION, AGITATING THE MIXTURE UNTIL A SUBSTANTIAL AMOUNT OF SODIUM NAPHTHALENE UNTIL A SUBSTANTIAL AMOUNT OF SODIUM NAPHTHALENE COVERING THE CRYSTALLINE SODIUM NAPHTHALENE BETASULFONATE SO OBTAINED, SAID SURFACE-ACTIVE AGENT BEING AN IONIC SURFACE-ACTIVE AGENT SELECTED FROM THE CLASS CONSISTING OF CATIONIC SURFACE-ACTIVE AGENT AGENTS AND ANIONIC SURFACE-ACTIVE AGENTS.
Claim 2
Dependent Claim
82 words
AS A NEW AND IMPROVED METHOD OF RECOVERING CRYSTALLINE SODIUM NAPHTHALENE BETA-SULFONATE FROM SUPERSATURATED AQUEOUS SOLUTIONS OF THE SAME, THE IMPROVED METHOD WHICH COMPRISES INCORPORATING A MINOR PROPORTION OF A SURFACE-ACTIVE AGENT IN SAID SOLUTION, AGITATING THE MIXTURE UNTIL A SUBSTANTIAL AMOUNT OF SODIUM NAPHTHALENE UNTIL A SUBSTANTIAL AMOUNT OF SODIUM NAPHTHALENE COVERING THE CRYSTALLINE SODIUM NAPHTHALENE BETASULFONATE SO OBTAINED, SAID SURFACE-ACTIVE AGENT BEING AN IONIC SURFACE-ACTIVE AGENT SELECTED FROM THE CLASS CONSISTING OF CATIONIC SURFACE-ACTIVE AGENT AGENTS AND ANIONIC SURFACE-ACTIVE AGENTS.
References Cited (Backward Citations)
US2139277A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-17 | 1955-03-19 | 1955-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-17 | 1959-03-19 | 1959-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-17 | 1963-03-19 | 1963-09-18 | $7700.00 | Window Closed / Lapsed |