US2646450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making unsaturated dimers of alpha-alkyl styrenes
Assignee: Dow Chemical Co
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Filing: 1951-05-25
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Granted: 1953-07-21
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Expires: 1971-05-25
Abstract
No abstract record available.
Inventors
- 👤 William S Thurber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:42
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/06; B01J27/14; B01J27/16; C; C07; C07C; C07C2/00; C07C2/02; C07C2/04; C07C2527/00; C07C2527/14; C07C2527/16; C07C2527/167; C07C2527/173
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A PROCESS, FOR MAKING THE UNSATURATED DIMERS OF AN ALPHA-ALKYL STYRENE, WHICH COMPRISES REACTING TOGETHER TWO MOLECULES OF AT LEAST ONE ALPHA-ALKYL STYRENE AT A TEMPERATURE BETWEEN 0* AND 130* C. IN THE PRESENCE OF FROM 0.05 TO 5 PER CENT BY WEIGHT OF A CATALYST MIXTURE CONTAINING AS THE ESSENTIAL INGREDIENTS FROM 80 TO 98 PER CENT BY WEIGHT OF A PHOSPHORUS OXYHALIDE SELECTED FROM THE GROUP CONSISTING OF PHOSPHORUS OXYCHLORIDE AND PHOSPHORUS OXYBROMIDE, AND FROM 20 TO 2 PER CENT OF A STRONG MINERAL ACID AND SEPARATING THE UNSATURATED DIMERS FROM THE REACTION MIXTURE.
Claim 2
Dependent Claim
96 words
A PROCESS, FOR MAKING THE UNSATURATED DIMERS OF AN ALPHA-ALKYL STYRENE, WHICH COMPRISES REACTING TOGETHER TWO MOLECULES OF AT LEAST ONE ALPHA-ALKYL STYRENE AT A TEMPERATURE BETWEEN 0* AND 130* C. IN THE PRESENCE OF FROM 0.05 TO 5 PER CENT BY WEIGHT OF A CATALYST MIXTURE CONTAINING AS THE ESSENTIAL INGREDIENTS FROM 80 TO 98 PER CENT BY WEIGHT OF A PHOSPHORUS OXYHALIDE SELECTED FROM THE GROUP CONSISTING OF PHOSPHORUS OXYCHLORIDE AND PHOSPHORUS OXYBROMIDE, AND FROM 20 TO 2 PER CENT OF A STRONG MINERAL ACID AND SEPARATING THE UNSATURATED DIMERS 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) | 1956-07-20 | 1957-01-19 | 1957-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-20 | 1961-01-19 | 1961-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-20 | 1965-01-19 | 1965-07-21 | $7700.00 | Window Closed / Lapsed |