Patent US2900413A successfully refreshed from Google Patents.
US2900413A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of lower aliphatic acids
Assignee: Celanese Corp
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Filing: 1956-03-12
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Granted: 1959-08-18
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Expires: 1976-03-12
Abstract
No abstract record available.
Inventors
- 👤 Adin L Stautzenberger
- 👤 Alexander F Maclean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:16
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/487
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
PROCESS FOR PURIFYING AN IMPURE LOWER ALIPHATIC ACID CONTAINING FROM 2 TO4 CARBON ATOMS WHICH COMPRISES HEATING IN THE LIQUID PHASE AT A TEMPERATURE OF AT LEAST 235*C. BUT BELOW THE TEMPERATURE AT WHICH SUBSTANTIAL DECOMPOSITION OF THE ACID OCCURS FOR FROM AOUT 1 TO 20 HOURS A MASS CONSISTING ESSENTIALLY OF SAID IMPURE ACID, 0 TO 10% BY WEIGHT OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF THE SODIUM AND POTASSIUM SALTS OF SAID ACID AND 0 TO 10% BY WEIGHT OF WATER.
Claim 2
Dependent Claim
85 words
PROCESS FOR PURIFYING AN IMPURE LOWER ALIPHATIC ACID CONTAINING FROM 2 TO4 CARBON ATOMS WHICH COMPRISES HEATING IN THE LIQUID PHASE AT A TEMPERATURE OF AT LEAST 235*C. BUT BELOW THE TEMPERATURE AT WHICH SUBSTANTIAL DECOMPOSITION OF THE ACID OCCURS FOR FROM AOUT 1 TO 20 HOURS A MASS CONSISTING ESSENTIALLY OF SAID IMPURE ACID, 0 TO 10% BY WEIGHT OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF THE SODIUM AND POTASSIUM SALTS OF SAID ACID AND 0 TO 10% BY WEIGHT OF WATER.
References Cited (Backward Citations)
US2255421A
Cited
US2126611A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-17 | 1963-02-16 | 1963-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-17 | 1967-02-16 | 1967-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-17 | 1971-02-16 | 1971-08-18 | $7700.00 | Window Closed / Lapsed |