Patent US2840511A successfully refreshed from Google Patents.
US2840511A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of extraction with 2-oxazolidone solvents
Assignee: Standard Oil Co
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Filing: 1955-07-08
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Granted: 1958-06-24
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Expires: 1975-07-08
Abstract
No abstract record available.
Inventors
- 👤 Paul N Rylander
- 👤 Jr William A Junk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:58
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/08; C10; C10G; C10G21/00; C10G21/06; C10G21/12; C10G21/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
31 words
A PROCESS FOR SELECTIVELY SEPARATING A HYDROCARBON FROM A MIXTURE OF HYDROCARBONS OF DIVERSE STRUCTURAL TYPE WHICH PROCESS COMPRISES SELECTIVELY EXTRACTING SAID MIXTURE WITH A LIQUID 2-OXAZOLIDONE COMPOUND HAVING THE FORMULA
Claim 2
Dependent Claim
31 words
A PROCESS FOR SELECTIVELY SEPARATING A HYDROCARBON FROM A MIXTURE OF HYDROCARBONS OF DIVERSE STRUCTURAL TYPE WHICH PROCESS COMPRISES SELECTIVELY EXTRACTING SAID MIXTURE WITH A LIQUID 2-OXAZOLIDONE COMPOUND HAVING THE FORMULA
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) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |