US2849459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of chromans, chromenes, and coumarons
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1953-06-22
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Granted: 1958-08-26
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Expires: 1973-06-22
Abstract
No abstract record available.
Inventors
- 👤 Robert F Leary
- 👤 Joseph F Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:48
CPC Classifications
C; C07; C07D; C07D311/00; C07D311/02; C07D311/04; C07D311/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
THE PROCESS WHICH COMPRISES REACTING, AT ELEVATED TEMPERATURES OF 120* TO 270*C. IN THE PRESENCE OF AN IRON METAL CATALYST, A MIXTURE OF OPEN-CHAIN C5 AND C6 DIOLEFINS CONTAINED IN A HYDROCARBON FRACTION SELECTED FROM THE GROUP CONSISTING OF BENZENE, TOLUENE, AND XYLENE FRACTIONS, WITH A PHENOLIC SOLVENT SELECTED FROM THE GROUP CONSISTING OF PHENOL AND CRESYLIC ACID, SEPARATING AND RECOVERING FROM HIGHER BOILING SLUDGE MATERIALS THE RESULTING MIXTURE OF AROMATIC CYCLIC ETHERS, WHOSE STRUCTURES RESULT FROM THE ATTACHMENT OF ONE MOLECULE OF SAID DIOLEFINS TO ONE MOLECULE OF SAID PHENOLIC SOLVENT, SAID ETHERS HAVING THE DICYCLIC RING STRUCTURES OF THE COMPOUNDS SELECTED FROM THE GROUP CONSISTING OF CHROMAN, CHROMENE, AND COUMARAN.
Claim 2
Dependent Claim
112 words
THE PROCESS WHICH COMPRISES REACTING, AT ELEVATED TEMPERATURES OF 120* TO 270*C. IN THE PRESENCE OF AN IRON METAL CATALYST, A MIXTURE OF OPEN-CHAIN C5 AND C6 DIOLEFINS CONTAINED IN A HYDROCARBON FRACTION SELECTED FROM THE GROUP CONSISTING OF BENZENE, TOLUENE, AND XYLENE FRACTIONS, WITH A PHENOLIC SOLVENT SELECTED FROM THE GROUP CONSISTING OF PHENOL AND CRESYLIC ACID, SEPARATING AND RECOVERING FROM HIGHER BOILING SLUDGE MATERIALS THE RESULTING MIXTURE OF AROMATIC CYCLIC ETHERS, WHOSE STRUCTURES RESULT FROM THE ATTACHMENT OF ONE MOLECULE OF SAID DIOLEFINS TO ONE MOLECULE OF SAID PHENOLIC SOLVENT, SAID ETHERS HAVING THE DICYCLIC RING STRUCTURES OF THE COMPOUNDS SELECTED FROM THE GROUP CONSISTING OF CHROMAN, CHROMENE, AND COUMARAN.
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) | 1961-08-25 | 1962-02-24 | 1962-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-25 | 1966-02-24 | 1966-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-25 | 1970-02-24 | 1970-08-26 | $7700.00 | Window Closed / Lapsed |