US3271382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of lignosulfonates from spent sulfite liquors
Assignee: Rayonier Inc
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Filing: 1963-09-26
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Granted: 1966-09-06
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Expires: 1983-09-26
Abstract
No abstract record available.
Inventors
- 👤 George R Quimby
- 👤 Goldschmid Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:50
CPC Classifications
C; C08; C08H; C08H6/00; D; D21; D21C; D21C11/00; D21C11/0007
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
THE PROCESS FOR THE SEPARATION OF LIGNOSULFONATE FROM SPENT SULFITE LIQUOR WHICH COMPRISES ADDING TO SAID LIQUOR A HIGH MOLECULAR WEIGHT QUATERNARY AMMONIUM SALT AND PRECIPITATING THE QUATERNARY AMMONIUM LIGNOSULFONATE, WASHING THE PRECIPITATE WITH WATER, DRYING THE PRECIPITATE, DISSOLVING THE DRIED PRECIPITATE IN A LOWER ALIPHATIC ALCOHOL, ADDING TO THE ALCOHOLIC SOLUTION AN ALKALI METAL SALT OF THE GROUP CONSISTING OF SODIUM CHLORIDE AND POTASSIUM CHLORIDE TO PRECIPITATE ALKALI METAL LIGNOSULFONATE, AND SEPARATING THE ALKALI METAL LIGNOSULFONATE PRECIPITATE FROM THE ALCOHOLIC SOLUTION.
Claim 2
Dependent Claim
82 words
THE PROCESS FOR THE SEPARATION OF LIGNOSULFONATE FROM SPENT SULFITE LIQUOR WHICH COMPRISES ADDING TO SAID LIQUOR A HIGH MOLECULAR WEIGHT QUATERNARY AMMONIUM SALT AND PRECIPITATING THE QUATERNARY AMMONIUM LIGNOSULFONATE, WASHING THE PRECIPITATE WITH WATER, DRYING THE PRECIPITATE, DISSOLVING THE DRIED PRECIPITATE IN A LOWER ALIPHATIC ALCOHOL, ADDING TO THE ALCOHOLIC SOLUTION AN ALKALI METAL SALT OF THE GROUP CONSISTING OF SODIUM CHLORIDE AND POTASSIUM CHLORIDE TO PRECIPITATE ALKALI METAL LIGNOSULFONATE, AND SEPARATING THE ALKALI METAL LIGNOSULFONATE PRECIPITATE FROM THE ALCOHOLIC SOLUTION.
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) | 1969-09-05 | 1970-03-07 | 1970-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-05 | 1974-03-07 | 1974-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-05 | 1978-03-07 | 1978-09-06 | $7700.00 | Window Closed / Lapsed |