US2703279A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organic acid digestion of lignocellulose
Assignee: Acordis UK Ltd
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Filing: 1950-05-06
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Granted: 1955-03-01
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Expires: 1970-05-06
Abstract
No abstract record available.
Inventors
- 👤 Bate Stanley Charles
- 👤 Peach Francis George
- 👤 Rogerson Walter Alan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:04
CPC Classifications
D; D21; D21C; D21C3/00; D21C3/003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
PROCESS FOR THE PRODUCTION OF CELLULOSE FROM LIGNOCELLULOSIC MATERIAL, WHICH COMPRISES HEATING THE MATERAIL WITHIN THE RANGE OF 110* AND 175* C. WITH A HOMOGENEOUS MIXTURE OF A SUBSTANCE SELECTED FROM THE GROUP WHICH CONSISTS OF ALIPHATIC ALPHA-HYDROXY ACIDS CONTAINING 2 TO 8 CARBON ATOMS IN THE MOLECULE AND THE ANHYDRIDES AND LACTIDES OF SUCH ACIDS, AND AS A DILUENT SUBSTANCE AN UNSUBSTITUTED MONOCARBOXYLIC ALIPHATIC ACID CONTAINING AT MOST 4 CARBIN ATOMS IN THE MOLECULE, THE PROPERTION OF THE SUBSTANCE OF SAID GROUPS IN TH MIXTURE BEING 25-85%, RECKONED AS THE ACID, AND HEATING BEING CONTAINED UNTIL SUBSTANTIALLY NO MORE LIGNIN DISSOLVES.
Claim 2
Dependent Claim
102 words
PROCESS FOR THE PRODUCTION OF CELLULOSE FROM LIGNOCELLULOSIC MATERIAL, WHICH COMPRISES HEATING THE MATERAIL WITHIN THE RANGE OF 110* AND 175* C. WITH A HOMOGENEOUS MIXTURE OF A SUBSTANCE SELECTED FROM THE GROUP WHICH CONSISTS OF ALIPHATIC ALPHA-HYDROXY ACIDS CONTAINING 2 TO 8 CARBON ATOMS IN THE MOLECULE AND THE ANHYDRIDES AND LACTIDES OF SUCH ACIDS, AND AS A DILUENT SUBSTANCE AN UNSUBSTITUTED MONOCARBOXYLIC ALIPHATIC ACID CONTAINING AT MOST 4 CARBIN ATOMS IN THE MOLECULE, THE PROPERTION OF THE SUBSTANCE OF SAID GROUPS IN TH MIXTURE BEING 25-85%, RECKONED AS THE ACID, AND HEATING BEING CONTAINED UNTIL SUBSTANTIALLY NO MORE LIGNIN DISSOLVES.
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) | 1958-02-28 | 1958-08-30 | 1959-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-02-28 | 1962-08-30 | 1963-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-02-28 | 1966-08-30 | 1967-03-01 | $7700.00 | Window Closed / Lapsed |