Patent US2638441A successfully refreshed from Google Patents.
US2638441A
Expired / Lapsed
US
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Process of contacting hydrocarbon mixtures with antimony trichloride
Assignee: Shell Development Co
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Filing: 1949-10-03
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Granted: 1953-05-12
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Expires: 1969-10-03
Abstract
No abstract record available.
Inventors
- 👤 Alan C Nixon
- 👤 Jr Carl H Deal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:27
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
IN THE EXTRACTIVE DISTILLATION OF A HYDROCARBON MIXTURE COMPRISING LOWER ALKYLAROMATIC HYDROCARBONS AND NON-AROMATICS OF SIMILAR BOILING RANGE, IN THE PRESENCE OF ATIMONY TRICHLORIDE AS A SELECTIVE SOLVENT, THE IMPROVEMENT WHICH COMPRISES REDUCING SUBSTANTIALLY THE DECOMPOSITION OF THE ANTIMONY TRICHLORIDE BY EFFECTING THE EXTRACTIVE DISTILLATION IN THE PRESENCE OF BETWEEN ABOUT 0.5% AND ABOUT 3% BY WEIGHT BASED ON THE ANTIMONY THRICHLORIDE, OF AN ORGANIC BASIC NITROGENOUS COMPOUND.
Claim 2
Dependent Claim
68 words
IN THE EXTRACTIVE DISTILLATION OF A HYDROCARBON MIXTURE COMPRISING LOWER ALKYLAROMATIC HYDROCARBONS AND NON-AROMATICS OF SIMILAR BOILING RANGE, IN THE PRESENCE OF ATIMONY TRICHLORIDE AS A SELECTIVE SOLVENT, THE IMPROVEMENT WHICH COMPRISES REDUCING SUBSTANTIALLY THE DECOMPOSITION OF THE ANTIMONY TRICHLORIDE BY EFFECTING THE EXTRACTIVE DISTILLATION IN THE PRESENCE OF BETWEEN ABOUT 0.5% AND ABOUT 3% BY WEIGHT BASED ON THE ANTIMONY THRICHLORIDE, OF AN ORGANIC BASIC NITROGENOUS COMPOUND.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |