US3040094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of aliphatic acids from black liquor
Assignee: West Virginia Pulp and Paper Co
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Filing: 1958-09-24
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Granted: 1962-06-19
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Expires: 1978-09-24
Abstract
No abstract record available.
Inventors
- 👤 Ira A Stine
- 👤 Jr Joseph Mcmanus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:03
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/0007
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
THE PROCESS OF OBTAINING AN ALIPHATIC ACID COMPONENT SELECTED FROM THE GROUP CONSISTING OF FORMIC, ACETIC, AND PROPIONIC ACIDS AND MIXTURES THEREOF FROM BLACK LIQUOR RESULTING FROM THE NEUTRAL OR ALKALINE PULPING OF WOOD AND CONTAINING SALTS OF A PLURALITY OF SAID ACIDS WHICH COMPRISES CONCENTRATING SAID BLACK LIQUOR TO A SOLIDS CONTENT OF BETWEEN 25 AND 60%, ACIDIFYING THE BLACK LIQUOR TO A PH BETWEEN 2 AND 4 THEREBY CONVERTING THE ACID SALTS TO THE FREE ACIDS, DISSOLVING THE ALIPHATIC ACID COMPONENT FROM THE CONCENTRATED ACIDIFIED BALCK LIQUOR WITH CYCLOHEXANNONE, REMOVING THE CYCLOHEXANNONEALIPHATIC ACID COMPONENT SOLUTION OBTAINED THEREBY FROM THE BLACK LIQUOR, AND RECOVERING THE ALIPHATIC ACID COMPONENT BY DISTILLATION.
Claim 2
Dependent Claim
111 words
THE PROCESS OF OBTAINING AN ALIPHATIC ACID COMPONENT SELECTED FROM THE GROUP CONSISTING OF FORMIC, ACETIC, AND PROPIONIC ACIDS AND MIXTURES THEREOF FROM BLACK LIQUOR RESULTING FROM THE NEUTRAL OR ALKALINE PULPING OF WOOD AND CONTAINING SALTS OF A PLURALITY OF SAID ACIDS WHICH COMPRISES CONCENTRATING SAID BLACK LIQUOR TO A SOLIDS CONTENT OF BETWEEN 25 AND 60%, ACIDIFYING THE BLACK LIQUOR TO A PH BETWEEN 2 AND 4 THEREBY CONVERTING THE ACID SALTS TO THE FREE ACIDS, DISSOLVING THE ALIPHATIC ACID COMPONENT FROM THE CONCENTRATED ACIDIFIED BALCK LIQUOR WITH CYCLOHEXANNONE, REMOVING THE CYCLOHEXANNONEALIPHATIC ACID COMPONENT SOLUTION OBTAINED THEREBY FROM THE BLACK LIQUOR, AND RECOVERING THE ALIPHATIC ACID COMPONENT BY DISTILLATION.
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) | 1965-06-18 | 1965-12-18 | 1966-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-18 | 1969-12-18 | 1970-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-18 | 1973-12-18 | 1974-06-19 | $7700.00 | Window Closed / Lapsed |