US3309356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separating levoglucosan and carbohydrate acids from aqueous mixtures containing the same-by solvent extraction
Assignee: Weyerhaeuser Co
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Filing: 1965-07-06
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Granted: 1967-03-14
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Expires: 1985-07-06
Abstract
No abstract record available.
Inventors
- 👤 Esterer Arnulf Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:54
CPC Classifications
C; C08; C08B; C08B1/00; C13; C13K; C13K13/00; C13K13/007
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
THE PROCESS OF SEPARATING AQUEOUS MIXTURES CONTAINING DISSOLVED LEVOGLUCOSAN AND CARBOHYDRATE DERIVED ACIDS, THE PROCESS COMPRISING: (A) REMOVING THE WATER CONTENT OF THE AQUEOUS MIXTURE, (B) ADDING TO THE RESULTING MIXTURE OF LEVOGLUCOSAN AND CARBOHYDRATE DERIVED ACIDS A SELECTIVE ORGANIC SOLVENT FOR THE LEVOGLUCOSAN, (C) SEPARATING THE RESULTING SOLUTION OF LEVOGLUCOSAN FROM THE RESULTING RESIDUE OF CARBOHYDRATE DERIVED ACIDS, (D) CRYSTALLIZING THE LEVOGLUCOSAN FROM THE SOLVENT, AND (E) SEPARATING THE CRYSTALLINE LEVOGLUCOSAN PRODUCT FROM THE RESULTING MOTHER LIQUOR.
Claim 2
Dependent Claim
78 words
THE PROCESS OF SEPARATING AQUEOUS MIXTURES CONTAINING DISSOLVED LEVOGLUCOSAN AND CARBOHYDRATE DERIVED ACIDS, THE PROCESS COMPRISING: (A) REMOVING THE WATER CONTENT OF THE AQUEOUS MIXTURE, (B) ADDING TO THE RESULTING MIXTURE OF LEVOGLUCOSAN AND CARBOHYDRATE DERIVED ACIDS A SELECTIVE ORGANIC SOLVENT FOR THE LEVOGLUCOSAN, (C) SEPARATING THE RESULTING SOLUTION OF LEVOGLUCOSAN FROM THE RESULTING RESIDUE OF CARBOHYDRATE DERIVED ACIDS, (D) CRYSTALLIZING THE LEVOGLUCOSAN FROM THE SOLVENT, AND (E) SEPARATING THE CRYSTALLINE LEVOGLUCOSAN PRODUCT FROM THE RESULTING MOTHER LIQUOR.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-13 | 1970-09-12 | 1971-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-13 | 1974-09-12 | 1975-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-13 | 1978-09-12 | 1979-03-14 | $7700.00 | Window Closed / Lapsed |