US2916497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of indoles
Assignee: Union Carbide Corp
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Filing: 1955-05-09
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Granted: 1959-12-08
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Expires: 1975-05-09
Abstract
No abstract record available.
Inventors
- 👤 Jr James V Murray
- 👤 John D Fales
- 👤 Charles H Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:35
CPC Classifications
C; C07; C07D; C07D209/00; C07D209/02; C07D209/04; C07D209/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A PROCESS FOR RECOVIRING INDOLES FROM AN INDOLESBEARING OIL CONTAINING AROMATIC HYDROCARBONS WHICH COMPRISES EXTRACTING AN INDOLES-CONTAINING EXTRACT FROM SAID INDOLES-BEARING OIL WITH A LOWER ALKYLENE CARBONATE; SEPARATING SAID EXTRACT TO REMOVE SAID CARBONATE AND LEAVE AN INDOLES-CONTAINING RESIDUE; ADDING AT LEAST ONE PARAFFIN HYDROCARBON HAVING A BOILING TEMPERATURE ABOVE 180*C. TO SAID RESIDUE TO FORM A SECOND MIXTURE; DISTILLING SAID SECOND MIXTURE TO REMOVE SAID INDOLES AS MINIMUMBOILING AZEOTROPES WITH SAID PARAFFIN HYDROCARBON; AND RECOVERING SAID INDOLES FROM SAID PARAFFIN HYDROCARBON.
Claim 2
Dependent Claim
82 words
A PROCESS FOR RECOVIRING INDOLES FROM AN INDOLESBEARING OIL CONTAINING AROMATIC HYDROCARBONS WHICH COMPRISES EXTRACTING AN INDOLES-CONTAINING EXTRACT FROM SAID INDOLES-BEARING OIL WITH A LOWER ALKYLENE CARBONATE; SEPARATING SAID EXTRACT TO REMOVE SAID CARBONATE AND LEAVE AN INDOLES-CONTAINING RESIDUE; ADDING AT LEAST ONE PARAFFIN HYDROCARBON HAVING A BOILING TEMPERATURE ABOVE 180*C. TO SAID RESIDUE TO FORM A SECOND MIXTURE; DISTILLING SAID SECOND MIXTURE TO REMOVE SAID INDOLES AS MINIMUMBOILING AZEOTROPES WITH SAID PARAFFIN HYDROCARBON; AND RECOVERING SAID INDOLES FROM SAID PARAFFIN HYDROCARBON.
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) | 1962-12-07 | 1963-06-08 | 1963-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-07 | 1967-06-08 | 1967-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-07 | 1971-06-08 | 1971-12-08 | $7700.00 | Window Closed / Lapsed |