Patent US3143574A successfully refreshed from Google Patents.
US3143574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of individual disulfides
Assignee: Universal Oil Products Co
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Filing: 1961-11-14
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Granted: 1964-08-04
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Expires: 1981-11-14
Abstract
No abstract record available.
Inventors
- 👤 Kenneth M Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:27
CPC Classifications
C; C07; C07C; C07C319/00; C07C319/26; C07C319/28; C07C319/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A METHOD FOR RECOVERING AN INDIVIDUAL ALKYL DISULFIDE FROM A MIXTURE OF ALKYL DISULFIDES WHICH ARE NOT SUFFICIENTLY STABLE TO PERMIT OF SEPARATION THEREOF BY HIGH TEMPERATURE FRACTIONATION, SAID METHOD COMPRISING SUBJECTING SAID MIXTURE TO REDUCTION TO FORM A MIXTURE OF ALKYL MERCAPTANS OF SUBSTANTIALLY LOWER BOILING POINTS THAN THE CORRESPONDING DISULFIDES, WHERBY THE ALKYL MERCAPTAN MIXTURE CAN BE FRACTIONATED WITHOUT DECOMPOSITION AT LOWER TEMPERATURE THAN THE DISULFIDE MIXTURE, FRACTIONATING THE MERCAPTAN MIXTURE AT THE LOWER TEMPERATURE TO SEPARATE AT LEAST ONE INDIVIDUAL ALKYL MERCAPTAN THEREFROM, OXIDIZING THE THUS SEPARATED ALKYL MERCAPTAN TO CONVERT THE SAME TO AN INDIVIDUAL ALKYL DISULFIDE AND SEPARATELY RECOVERING THE LATTER.
Claim 2
Independent Claim
106 words
A METHOD FOR RECOVERING AN INDIVIDUAL ALKYL DISULFIDE FROM A MIXTURE OF ALKYL DISULFIDES WHICH ARE NOT SUFFICIENTLY STABLE TO PERMIT OF SEPARATION THEREOF BY HIGH TEMPERATURE FRACTIONATION, SAID METHOD COMPRISING SUBJECTING SAID MIXTURE TO REDUCTION TO FORM A MIXTURE OF ALKYL MERCAPTANS OF SUBSTANTIALLY LOWER BOILING POINTS THAN THE CORRESPONDING DISULFIDES, WHERBY THE ALKYL MERCAPTAN MIXTURE CAN BE FRACTIONATED WITHOUT DECOMPOSITION AT LOWER TEMPERATURE THAN THE DISULFIDE MIXTURE, FRACTIONATING THE MERCAPTAN MIXTURE AT THE LOWER TEMPERATURE TO SEPARATE AT LEAST ONE INDIVIDUAL ALKYL MERCAPTAN THEREFROM, OXIDIZING THE THUS SEPARATED ALKYL MERCAPTAN TO CONVERT THE SAME TO AN INDIVIDUAL ALKYL DISULFIDE AND SEPARATELY RECOVERING THE LATTER.
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) | 1967-08-04 | 1968-02-03 | 1968-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-04 | 1972-02-03 | 1972-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-04 | 1976-02-03 | 1976-08-04 | $7700.00 | Window Closed / Lapsed |