US2834820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent extraction of organic mixtures with mixed glycol ethers as solvents
Assignee: Universal Oil Products Co
•
Filing: 1953-07-28
•
Granted: 1958-05-13
•
Expires: 1973-07-28
Abstract
No abstract record available.
Inventors
- 👤 Herman S Bloch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:53
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/06; C10G21/12; C10G21/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
30 words
A SOLVENT EXTRACTION PROCESS WHICH COMPRISES CONTACTING A FEED STOCK CONTAINING AN AROMATIC HYDROCARBON WITH A SOLVENT COMPRISING A MIXED ETHER-GLYCOL OF ETHYLENE AND PROPYLENE GLYCOLS HAVING THE EMPIRICAL FORMULA:
Claim 2
Dependent Claim
30 words
A SOLVENT EXTRACTION PROCESS WHICH COMPRISES CONTACTING A FEED STOCK CONTAINING AN AROMATIC HYDROCARBON WITH A SOLVENT COMPRISING A MIXED ETHER-GLYCOL OF ETHYLENE AND PROPYLENE GLYCOLS HAVING THE EMPIRICAL FORMULA:
References Cited (Backward Citations)
US2141443A
Cited
US1633927A
Cited
US2414252A
Cited
US2357028A
Cited
US2520611A
Cited
US2706182A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-12 | 1961-11-11 | 1962-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-12 | 1965-11-11 | 1966-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-12 | 1969-11-11 | 1970-05-13 | $7700.00 | Window Closed / Lapsed |