US2831905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gamma-butyrolactone as a selective solvent for hydrocarbons
Assignee: Phillips Petroleum Co
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Filing: 1956-04-09
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Granted: 1958-04-22
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Expires: 1976-04-09
Abstract
No abstract record available.
Inventors
- 👤 William T Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:42
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/06; C10G21/12; C10G21/16; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/08; C07C7/10; C07C2601/00; C07C2601/12; C07C2601/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
IN A PROCESS FOR THE SEPARATION OF ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF NORMALLY LIQUID AROMATIC, OLEFINIC, NAPHTHENIC, AND PARAFFINIC HYDROCARBONS, FROM ANOTHER MEMBER OF THIS GROUP BY SOLVENT EXTRACTION AND EXTRACTIVE DISTILLATION PROCESS AT A TEMPERATURES OF AT LEAST 20*C., THE STEP OF TREATING THE MIXTURE WITH A SELECTIVE CONSISTING ESSENTIALLY OF GRAMMA-BUTYROLACTONE.
Claim 2
Dependent Claim
56 words
IN A PROCESS FOR THE SEPARATION OF ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF NORMALLY LIQUID AROMATIC, OLEFINIC, NAPHTHENIC, AND PARAFFINIC HYDROCARBONS, FROM ANOTHER MEMBER OF THIS GROUP BY SOLVENT EXTRACTION AND EXTRACTIVE DISTILLATION PROCESS AT A TEMPERATURES OF AT LEAST 20*C., THE STEP OF TREATING THE MIXTURE WITH A SELECTIVE CONSISTING ESSENTIALLY OF GRAMMA-BUTYROLACTONE.
References Cited (Backward Citations)
US2063680A
Cited
US2738860A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |