US2813122A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adipic acid crystallization
Assignee: EIDP Inc
•
Filing: 1953-08-27
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Granted: 1957-11-12
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Expires: 1973-08-27
Abstract
No abstract record available.
Inventors
- 👤 William B Clark
- 👤 Robert E Gee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:52
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/43
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
IN A PROCESS FOR CRYSTALLIZING ADIPIC ACID THE STEPS WHICH COMPRISE PREPARING AN AQUEOUS SOLUTION CONTAINING ADIPIC AND NITRIC ACIDS, SATURATING THE SOLUTION, COOLING SAID SOLUTION 2*C. TO 5*C. BELOW ITS SATURATION TEMPERATURE, CRYSTALLIZING THE ADIPIC ACID, SUPPRESSING THE RATE OF NUCLEATION WITH AT LEAST 0.1% BY WEIGHT OF AN ORGANIC MONOBASIC ACID CONTAINING 2 TO 8 CARBON ATOMS, AND INCREASING THE RATE OF CRYSTAL GROWTH BY CONDUCTING THE CRYSTALLIZATING AT TEMPERATURES BETWEEN ABOUT 40*C. AND ABOUT 70*C.
Claim 2
Dependent Claim
78 words
IN A PROCESS FOR CRYSTALLIZING ADIPIC ACID THE STEPS WHICH COMPRISE PREPARING AN AQUEOUS SOLUTION CONTAINING ADIPIC AND NITRIC ACIDS, SATURATING THE SOLUTION, COOLING SAID SOLUTION 2*C. TO 5*C. BELOW ITS SATURATION TEMPERATURE, CRYSTALLIZING THE ADIPIC ACID, SUPPRESSING THE RATE OF NUCLEATION WITH AT LEAST 0.1% BY WEIGHT OF AN ORGANIC MONOBASIC ACID CONTAINING 2 TO 8 CARBON ATOMS, AND INCREASING THE RATE OF CRYSTAL GROWTH BY CONDUCTING THE CRYSTALLIZATING AT TEMPERATURES BETWEEN ABOUT 40*C. AND ABOUT 70*C.
References Cited (Backward Citations)
US2285601A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-11 | 1961-05-13 | 1961-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-11 | 1965-05-13 | 1965-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-11 | 1969-05-13 | 1969-11-12 | $7700.00 | Window Closed / Lapsed |