US2557257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extractive fractionation process
Assignee: —
•
Filing: 1949-01-29
•
Granted: 1951-06-19
•
Expires: 1969-01-29
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:46
CPC Classifications
C; C10; C10G; C10G31/00; C10G31/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
93 words
THE PROCESS FOR THE SEPARATION OF STRAIGHTCHAIN ORGANIC COMPOUNDS FROM A LIQUID MIXTURE THEREOF WITH NON-STRAIGHT-CHAIN ORGANIC COMPOUNDS WHICH COMPRISES CONTACTING SAID MIXTURE WITH AN AQUEOUS PHASE HAVING DISSOLVED THEREIN UREA AND AN AGENT OF THE GROUP CONSISTING OF WATER-SOLUBLE NITRITES, IODATES AND CHROMATES AND MIXTURES THEREOF, WHEREBY CRYSTALLINE MOLECULAR COMPLEXES FORM BETWEEN UREA AND STRAIGHT-CHAIN ORGANIC COMPOUNDS, AND SUBSEQUENTLY SEPARATING SAID AQUEOUS PHASE FROM SAID LIQUID ORGANIC COMPOUNDS, THE AMOUNT OF SAID AGENT BEING AT LEAST SUFFICIENT TO SUBSTANTIALLY SUPPRESS THE EMULSIFICATION OF THE AQUEOUS PHASE AND THE LIQUID ORGANIC COMPOUNDS MIXTURE.
References Cited (Backward Citations)
US1891987A
Cited
US2305549A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-18 | 1954-12-18 | 1955-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-18 | 1958-12-18 | 1959-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-18 | 1962-12-18 | 1963-06-19 | $7700.00 | Window Closed / Lapsed |