US2761886A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of coupling styrene with alkyl aromatics
Assignee: Millennium Petrochemicals Inc
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Filing: 1954-06-16
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Granted: 1956-09-04
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Expires: 1974-06-16
Abstract
No abstract record available.
Inventors
- 👤 Charles E Frank
- 👤 James S Swinehart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:46
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/54; C07C2/72; C07C2523/00; C07C2523/02; C07C2523/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A METHOD OF COUPLING STYRENE WITH ALKYL AROMATICS WHICH COMPRISES MAINTAINING A BODY OF ALKYL AROMATICS CONTAINING DISPERSED ALKALI METAL IN THE FORM OF SUSPENDED DROPLETS HAVING A DIAMETER NOT GREATER THAN 50 MICRONS, AT A TEMPERATURE BETWEEN 60* AND 200* C., AND ADDING STYRENE THERETO AT A SUBSTANTIALLY UNIFORM RATE NOT GREATER THAN 0.05 MOLE OF STYRENE PER HOUR PER MOL OF ALKALI METAL PRESENT IN THE REACTING MIXTURE, MAINTAINING AN AMOUNT OF ALKALI METAL AT ALL TIMES DURING THE REACTION PERIOD OF AT LEAST 1 MOLE OF A ALKALI METAL TO 10-12 MOLES OF ALKYL AROMATICS (BOTH FREE AND COMBINED), AND MAINTAINING THE MOLE RATIO OF TOTAL STYRENE (BOTH FREE AND COMBINED) TO A TOTAL ALKYL AROMATICS (BOTH FREE AND COMBINED) TO A RATIO NOT EXCEEDING 1 TO ABOUT 5.
Claim 2
Independent Claim
132 words
A METHOD OF COUPLING STYRENE WITH ALKYL AROMATICS WHICH COMPRISES MAINTAINING A BODY OF ALKYL AROMATICS CONTAINING DISPERSED ALKALI METAL IN THE FORM OF SUSPENDED DROPLETS HAVING A DIAMETER NOT GREATER THAN 50 MICRONS, AT A TEMPERATURE BETWEEN 60* AND 200* C., AND ADDING STYRENE THERETO AT A SUBSTANTIALLY UNIFORM RATE NOT GREATER THAN 0.05 MOLE OF STYRENE PER HOUR PER MOL OF ALKALI METAL PRESENT IN THE REACTING MIXTURE, MAINTAINING AN AMOUNT OF ALKALI METAL AT ALL TIMES DURING THE REACTION PERIOD OF AT LEAST 1 MOLE OF A ALKALI METAL TO 10-12 MOLES OF ALKYL AROMATICS (BOTH FREE AND COMBINED), AND MAINTAINING THE MOLE RATIO OF TOTAL STYRENE (BOTH FREE AND COMBINED) TO A TOTAL ALKYL AROMATICS (BOTH FREE AND COMBINED) TO A RATIO NOT EXCEEDING 1 TO ABOUT 5.
References Cited (Backward Citations)
US2386507A
Cited
US2448641A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-04 | 1960-03-05 | 1960-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-04 | 1964-03-05 | 1964-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-04 | 1968-03-05 | 1968-09-04 | $7700.00 | Window Closed / Lapsed |