Patent US3290369A successfully refreshed from Google Patents.
US3290369A
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Recovery of acyclic dicarboxylic acids from mixtures of the same
Assignee: Honeywell International Inc
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Filing: 1962-02-19
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Granted: 1966-12-06
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Expires: 1982-02-19
Abstract
No abstract record available.
Inventors
- 👤 John H Bonfield
- 👤 Reed H Belden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:02
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/43; C07C51/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
THE PROCESS FOR THE SEPARATION AND RECOVERY OF SUCCINIC, ADIPIC, AND GLUTARIC ACIDS FROM LIQUORS CONTAINTING THEM IN ADMIXTURE WITH ONE ANOTHER COMPRISING DISTILLING THE MIXTURE UNDER REDUCED PRESSURE SO AS TO OBTAN TWO FRACTIONS, THE FIRST CONTAINING SUBSTANTIALLY ALL OF THE SUCCINIC ACID AND A PORTION OF THE GULTARIC AND THE SECOND SUBSTANTIALLY ALL OF THE ADIPIC AND A PORTION OF THE GLUTARIC; RECRYSTALLIZING THE INDIVIDUAL FRACTIONS FROM WATER TO ISOLATE PURE SUCCINIC ACID FROM THE FIRST FRACTION AND PURE ADIPIC ACID FROM THE SECOND FRACTION; AND SEPARATING GLUTARIC FROM THE MOTHER LIQUORS OBTAINED IN THE RECRYSTALLIZATION STEP BY EVAPORATING THE MOTHER LIQUOR TO DRYNESS.
Claim 2
Dependent Claim
106 words
THE PROCESS FOR THE SEPARATION AND RECOVERY OF SUCCINIC, ADIPIC, AND GLUTARIC ACIDS FROM LIQUORS CONTAINTING THEM IN ADMIXTURE WITH ONE ANOTHER COMPRISING DISTILLING THE MIXTURE UNDER REDUCED PRESSURE SO AS TO OBTAN TWO FRACTIONS, THE FIRST CONTAINING SUBSTANTIALLY ALL OF THE SUCCINIC ACID AND A PORTION OF THE GULTARIC AND THE SECOND SUBSTANTIALLY ALL OF THE ADIPIC AND A PORTION OF THE GLUTARIC; RECRYSTALLIZING THE INDIVIDUAL FRACTIONS FROM WATER TO ISOLATE PURE SUCCINIC ACID FROM THE FIRST FRACTION AND PURE ADIPIC ACID FROM THE SECOND FRACTION; AND SEPARATING GLUTARIC FROM THE MOTHER LIQUORS OBTAINED IN THE RECRYSTALLIZATION STEP BY EVAPORATING THE MOTHER LIQUOR TO DRYNESS.
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) | 1969-12-05 | 1970-06-06 | 1970-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-05 | 1974-06-06 | 1974-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-05 | 1978-06-06 | 1978-12-06 | $7700.00 | Window Closed / Lapsed |