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US2932675A
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Solvent extraction using substituted oxazolidones
Assignee: Union Carbide Corp
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Filing: 1955-12-28
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Granted: 1960-04-12
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Expires: 1975-12-28
Abstract
No abstract record available.
Inventors
- 👤 Arthur B Steele
- 👤 John B O'neal
- 👤 John R Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:03
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/10; C07D; C07D263/00; C07D263/02; C07D263/08; C07D263/16; C07D263/18; C07D263/20; C07D263/22; C10; C10G; C10G21/00; C10G21/06; C10G21/12; C10G21/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
A PROCESS FOR SEPARATING A HYDROCARBON MIXTURE INTO A MORE AROMATIC AND A LESS AROMATIC FRACTION WHICH COMPRISES EXTRACTING THE MORE AROMATIC FRACTION FROM THE MIXTURE WITH A SOLVENT COMPRISING A SUBSTITUTED OXAZOLIDONE HAVING THE FORMULA:
Claim 2
Dependent Claim
36 words
A PROCESS FOR SEPARATING A HYDROCARBON MIXTURE INTO A MORE AROMATIC AND A LESS AROMATIC FRACTION WHICH COMPRISES EXTRACTING THE MORE AROMATIC FRACTION FROM THE MIXTURE WITH A SOLVENT COMPRISING A SUBSTITUTED OXAZOLIDONE HAVING THE FORMULA:
References Cited (Backward Citations)
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US2840511A
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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) | 1963-04-12 | 1963-10-12 | 1964-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-12 | 1967-10-12 | 1968-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-12 | 1971-10-12 | 1972-04-12 | $7700.00 | Window Closed / Lapsed |