US2667507A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of disulfonic acids
Assignee: Celanese Corp
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Filing: 1951-05-08
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Granted: 1954-01-26
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Expires: 1971-05-08
Abstract
No abstract record available.
Inventors
- 👤 Jones Wilford Donald
- 👤 Samuel B Mcfarlane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:24
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/02; C07C303/22; C07C303/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
PROCESS FOR THE PRODUCTIONN OF DISULPHONIC ACIDS, WHICH COMPRISES ADDING A HYDROCARBON DITHIOL IN WHICH THE HYDROCARBON CONTAINS NO MORE THAN TWELVE CARBON ATOMS TO A SOLUTION IN GLACIAL ACETIC ACID OF A 30 TO 90% AQUEOUS SOLUTION OF HYDROGEN PEROXIDE CONTAINING A STOICHIOMETRIC EXCESS OF HYDROGEN PEROXIDE WHILE MAINTAINING THE REACTION MIXTURE AT A TEMPERATURE OF FROM 80 TO 115* C., AND RECOVERING THE DISULPHONIC ACID FROM THE REACTION MIXTURE.
Claim 2
Dependent Claim
71 words
PROCESS FOR THE PRODUCTIONN OF DISULPHONIC ACIDS, WHICH COMPRISES ADDING A HYDROCARBON DITHIOL IN WHICH THE HYDROCARBON CONTAINS NO MORE THAN TWELVE CARBON ATOMS TO A SOLUTION IN GLACIAL ACETIC ACID OF A 30 TO 90% AQUEOUS SOLUTION OF HYDROGEN PEROXIDE CONTAINING A STOICHIOMETRIC EXCESS OF HYDROGEN PEROXIDE WHILE MAINTAINING THE REACTION MIXTURE AT A TEMPERATURE OF FROM 80 TO 115* C., AND RECOVERING THE DISULPHONIC ACID FROM THE REACTION MIXTURE.
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) | 1957-01-25 | 1957-07-27 | 1958-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-25 | 1961-07-27 | 1962-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-25 | 1965-07-27 | 1966-01-26 | $7700.00 | Window Closed / Lapsed |