US2644826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Di-nitrogen containing di-carboxylic acids
Assignee: TIDE WATER ASSOCIATED OIL Co
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Filing: 1951-06-15
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Granted: 1953-07-07
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Expires: 1971-06-15
Abstract
No abstract record available.
Inventors
- 👤 John D Spivack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:47
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C10M2215/00; C10M2215/08; C10M2215/082; C10M2215/12; C10M2215/24; C10M2215/28; C10N; C10N2040/00; C10N2040/135
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
21 words
DI(N-CARBOXYALKYL ALKANAMIDES) IN WHICH THE ALKANOYL RADICAL OF THE ALKANAMIDE GROUPING IS AN ALKANOYL RESIDUE OF A LONG CHAIN FATTY ACID.
Claim 2
Dependent Claim
21 words
DI(N-CARBOXYALKYL ALKANAMIDES) IN WHICH THE ALKANOYL RADICAL OF THE ALKANAMIDE GROUPING IS AN ALKANOYL RESIDUE OF A LONG CHAIN FATTY ACID.
Claim 3
Independent Claim
102 words
A METHOD FOR PREPARATION OF A COMPOUND CONTAINING TWO NITROGEN ATOMS AND TWO CARBOXYLIC GROUPS PER MOLECULE FROM A (N-ALKANOYL) IMINODIPROPIONITRILE IN WHICH THE ALKANOYL RADICAL IN THE (N-ALKANOYL) GROUP IS AN ALKANOYL RESIDUE OF A FATTY ACID OF ABOUT 6 TO ABOUT 30 CARBON ATOMS WHICH COMPRISES SUBJECTING SAID NITRILE TO BASIC HYDROLYSIS IN PRESENCE OF AN ALCOHOL UNDER AMMONIA-PRODUCING CONDITIONS TO PRODUCE A REACTION MIXTUE COMPRISING A COMPOUND CONTAINING TWO NITROGEN ATOMS AND TWO CARBOXYLIC GROUPS PER MOLECULE IN THE FORM OF A SALT THEREOF, AND HYDROLYZING THE REACTION MIXTURE TO CONVERT SAID SALT TO ITS CORRESPONDING FREE DICARBOXYLIC ACID.
Claim 4
Independent Claim
102 words
A METHOD FOR PREPARATION OF A COMPOUND CONTAINING TWO NITROGEN ATOMS AND TWO CARBOXYLIC GROUPS PER MOLECULE FROM A (N-ALKANOYL) IMINODIPROPIONITRILE IN WHICH THE ALKANOYL RADICAL IN THE (N-ALKANOYL) GROUP IS AN ALKANOYL RESIDUE OF A FATTY ACID OF ABOUT 6 TO ABOUT 30 CARBON ATOMS WHICH COMPRISES SUBJECTING SAID NITRILE TO BASIC HYDROLYSIS IN PRESENCE OF AN ALCOHOL UNDER AMMONIA-PRODUCING CONDITIONS TO PRODUCE A REACTION MIXTUE COMPRISING A COMPOUND CONTAINING TWO NITROGEN ATOMS AND TWO CARBOXYLIC GROUPS PER MOLECULE IN THE FORM OF A SALT THEREOF, AND HYDROLYZING THE REACTION MIXTURE TO CONVERT SAID SALT TO ITS CORRESPONDING FREE DICARBOXYLIC ACID.
References Cited (Backward Citations)
US2047069A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-06 | 1957-01-05 | 1957-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-06 | 1961-01-05 | 1961-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-06 | 1965-01-05 | 1965-07-07 | $7700.00 | Window Closed / Lapsed |