Patent US2549372A successfully refreshed from Google Patents.
US2549372A
Expired / Lapsed
US
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Extractive fractionation process
Assignee: —
•
Filing: 1947-04-15
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Granted: 1951-04-17
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Expires: 1967-04-15
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:05
CPC Classifications
C; C10; C10G; C10G31/00; C10G31/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
IN THE PROCESS OF FRACTIONATING A MIXTURE OF ORGANIC COMPOUNDS, SAID MIXTURE CONTAINING A FRACTION A COMPRISING SUBSTANTIALLY STRAIGHCHAIN MATERIALS AND A FRACTION B COMPRISING PREDOMINANTLY NON-STRAIGHT-CHAIN MATERIALS, WHEREIN SAID MIXTURE IS TREATED WITH UREA AND THE CRYSTALLINE COMPLEXES WHICH FORM BETWEEN UREA AND AT LEAST PART OF FRACTION A ARE SEPARATED FROM FRACTION B, SAID TREATMENT BEING CONDUCTED BELOW THE DECOMPOSITION TEMPERATURES OF SAID COMPLEXES, THE IMPROVEMENT WHICH COMPRISES RECYCLING AT LEAST PART OF THE FRACTION A THUS SEPARATED TO ENRICH ADDITIONAL AMOUNTS OF THE ORIGINAL
Claim 2
Dependent Claim
87 words
IN THE PROCESS OF FRACTIONATING A MIXTURE OF ORGANIC COMPOUNDS, SAID MIXTURE CONTAINING A FRACTION A COMPRISING SUBSTANTIALLY STRAIGHCHAIN MATERIALS AND A FRACTION B COMPRISING PREDOMINANTLY NON-STRAIGHT-CHAIN MATERIALS, WHEREIN SAID MIXTURE IS TREATED WITH UREA AND THE CRYSTALLINE COMPLEXES WHICH FORM BETWEEN UREA AND AT LEAST PART OF FRACTION A ARE SEPARATED FROM FRACTION B, SAID TREATMENT BEING CONDUCTED BELOW THE DECOMPOSITION TEMPERATURES OF SAID COMPLEXES, THE IMPROVEMENT WHICH COMPRISES RECYCLING AT LEAST PART OF THE FRACTION A THUS SEPARATED TO ENRICH ADDITIONAL AMOUNTS OF THE ORIGINAL
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) | 1954-04-16 | 1954-10-16 | 1955-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-16 | 1958-10-16 | 1959-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-16 | 1962-10-16 | 1963-04-17 | $7700.00 | Window Closed / Lapsed |