US2840607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of dibasic acids
Assignee: Union Oil Company of California
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Filing: 1956-02-20
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Granted: 1958-06-24
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Expires: 1976-02-20
Abstract
No abstract record available.
Inventors
- 👤 Jr Edward C Attane
- 👤 Thomas F Doumani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:27
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/43
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A METHOD FOR RESOLVING A MIXTURE OF ADIPIC AND SUCCINIC ACIDS WHICH COMPRISES SUBJECTING SAID MIXTURE TO A FIRST FRACTIONAL CRYSTALLIZATION FROM A SOLVENT SELECTED FROM THE CLASS CONSISTING OF WATER AND LOWER ALIPHATIC KETONES, TO OBTAIN A FIRST CROP OF CRYSTALS CONTAINING A RATIO OF SAID ACIDS ONE TO ANOTHER WHICH IS SUBSTANTIALLY DIFFERENT FROM THE RATIO REMAINING IN IT MOTHER LIQUOR, THEN EVAPORATING SAID MOTHER LIQUOR TO DRYNESS AND SUBJECTING THE RESIDUE TO A SECOND FRACTIONAL CRYSTALLIZATION FROM A SOLVENT SELECTED FROM TH OTHER OF SAID SOLVENT GROUPS.
Claim 2
Independent Claim
90 words
A METHOD FOR RESOLVING A MIXTURE OF ADIPIC AND SUCCINIC ACIDS WHICH COMPRISES SUBJECTING SAID MIXTURE TO A FIRST FRACTIONAL CRYSTALLIZATION FROM A SOLVENT SELECTED FROM THE CLASS CONSISTING OF WATER AND LOWER ALIPHATIC KETONES, TO OBTAIN A FIRST CROP OF CRYSTALS CONTAINING A RATIO OF SAID ACIDS ONE TO ANOTHER WHICH IS SUBSTANTIALLY DIFFERENT FROM THE RATIO REMAINING IN IT MOTHER LIQUOR, THEN EVAPORATING SAID MOTHER LIQUOR TO DRYNESS AND SUBJECTING THE RESIDUE TO A SECOND FRACTIONAL CRYSTALLIZATION FROM A SOLVENT SELECTED FROM TH OTHER OF SAID SOLVENT GROUPS.
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) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |