Patent US2793983A successfully refreshed from Google Patents.
US2793983A
Expired / Lapsed
US
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Production of doctor-sweet noncorrosive naphthas
Assignee: Pure Oil Co
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Filing: 1956-03-30
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Granted: 1957-05-28
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Expires: 1976-03-30
Abstract
No abstract record available.
Inventors
- 👤 George W Ayers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:37
CPC Classifications
C; C10; C10G; C10G19/00; C10G19/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
91 words
THE METHOD FOR PREPARING NAPHTHA HAVING A NEGATIVE DISTILLATION-CORROSION TEST COMPRISING TREATING A SWEETENED NAPHTHA CONTAINING FRACTIONS BOILING ABOVE 300* F. WITH A THIOPHENOL IN AMOUNT SUCH THAT THE AMOUNT OF SULFUR THEREIN IS AT LEAST EQUAL TO THE DISULFIDE CONTENT OF THE NAPHTHA, MAINTAINING THE TEMPERATURE OF THE MIXTURE BELOW ABOUT 300* F. UNTIL UPON DISTILLATION THE OVERHEAD SHOWS A SHARP DECREASE IN MERCAPTAN CONTENT, WASHING THE TREATED NAPHTHA WITH CAUSTIC ALKALI SOLUTION, SWEETENING THE CAUSTIC-WASHED NAPTHA AND THEN DISTILLING TO OBTAIN DESIRED FRACTIONS HAVINE END-POINTS BELOW ABOUT 400* F.
Claim 2
Independent Claim
91 words
THE METHOD FOR PREPARING NAPHTHA HAVING A NEGATIVE DISTILLATION-CORROSION TEST COMPRISING TREATING A SWEETENED NAPHTHA CONTAINING FRACTIONS BOILING ABOVE 300* F. WITH A THIOPHENOL IN AMOUNT SUCH THAT THE AMOUNT OF SULFUR THEREIN IS AT LEAST EQUAL TO THE DISULFIDE CONTENT OF THE NAPHTHA, MAINTAINING THE TEMPERATURE OF THE MIXTURE BELOW ABOUT 300* F. UNTIL UPON DISTILLATION THE OVERHEAD SHOWS A SHARP DECREASE IN MERCAPTAN CONTENT, WASHING THE TREATED NAPHTHA WITH CAUSTIC ALKALI SOLUTION, SWEETENING THE CAUSTIC-WASHED NAPTHA AND THEN DISTILLING TO OBTAIN DESIRED FRACTIONS HAVINE END-POINTS BELOW ABOUT 400* F.
Claim 3
Dependent Claim
28 words
METHOD IN ACCORDANCE WITH CLAIM 1 IN WHICH THE NAPHTHA IS ONE WHICH IS SWEETENED BY TREATMENT WITH OXYGEN IN THE PRESENCE OF CLAY IMPREGNATED WITH CUPIC CHLORIDE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-05-27 | 1960-11-26 | 1961-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-27 | 1964-11-26 | 1965-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-27 | 1968-11-26 | 1969-05-28 | $7700.00 | Window Closed / Lapsed |