US2816913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of substituted acids
Assignee: Millennium Petrochemicals Inc
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Filing: 1953-11-25
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Granted: 1957-12-17
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Expires: 1973-11-25
Abstract
No abstract record available.
Inventors
- 👤 Charles E Frank
- 👤 John R Leebrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:06
CPC Classifications
C; C07; C07F; C07F1/00; C07C; C07C51/00; C07C51/15; C07C57/00; C07C57/30; C07C57/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
A SELECTIVE DIMERIZATION PROCESS WHICH COMPRISES REACTING (1) A VINYL AROMATIC COMPOUND FROM THE GROUP CONSISTING OF STYRENE AND STYRENE HAVING AN ALKYL SUBSTITUENT FOR A NUCLEAR HYDROGEN ATOM WITH (2) A FINELY DISPERSED ALKALI METAL IN (3) A REACTION MEDIUM CONSISTING SUBSTANTIALLY OF AN ETHER SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC MONOETHERS HAVING A METHOXY GROUP AND AN OXYGEN TO CARBON RATIO OF NOT LESS THAN 1:4 AND POLYETHERS DERIVED FROM AN ALIPHATIC POLYHYDRIC ALCOHOL HAVING ALL THE HYDROXYL HYDROGEN ATOMS REPLACED BY ALKYL GROUPS AND MIXTURES THEREOF, IN THE PRESENCE OF (4) A RELATIVELY SMALL AMOUNT OF A POLYCYCLIC AROMATIC COMPOUND AT (5) A TEMPERATURE OF BELOW ABOUT O* C. TO PROVIDE A REACTION MIXTURE COMPRISING DIALKALI METAL DIMERS OF THE VINYL AROMATIC COMPOUND.
Claim 2
Dependent Claim
127 words
A SELECTIVE DIMERIZATION PROCESS WHICH COMPRISES REACTING (1) A VINYL AROMATIC COMPOUND FROM THE GROUP CONSISTING OF STYRENE AND STYRENE HAVING AN ALKYL SUBSTITUENT FOR A NUCLEAR HYDROGEN ATOM WITH (2) A FINELY DISPERSED ALKALI METAL IN (3) A REACTION MEDIUM CONSISTING SUBSTANTIALLY OF AN ETHER SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC MONOETHERS HAVING A METHOXY GROUP AND AN OXYGEN TO CARBON RATIO OF NOT LESS THAN 1:4 AND POLYETHERS DERIVED FROM AN ALIPHATIC POLYHYDRIC ALCOHOL HAVING ALL THE HYDROXYL HYDROGEN ATOMS REPLACED BY ALKYL GROUPS AND MIXTURES THEREOF, IN THE PRESENCE OF (4) A RELATIVELY SMALL AMOUNT OF A POLYCYCLIC AROMATIC COMPOUND AT (5) A TEMPERATURE OF BELOW ABOUT O* C. TO PROVIDE A REACTION MIXTURE COMPRISING DIALKALI METAL DIMERS OF THE VINYL AROMATIC COMPOUND.
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) | 1960-12-16 | 1961-06-17 | 1961-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-16 | 1965-06-17 | 1965-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-16 | 1969-06-17 | 1969-12-17 | $7700.00 | Window Closed / Lapsed |