US2736635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing sulfite cooking liquors and recovering valuable constituents therefrom
Assignee: Veolia WTS Systems USA Inc
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Filing: 1951-07-07
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Granted: 1956-02-28
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Expires: 1971-07-07
Abstract
No abstract record available.
Inventors
- 👤 Haywood Gerald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:11
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/0042; D21C11/005; Y; Y10; Y10S; Y10S423/00; Y10S423/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A METHOD OF RECOVERING BASE IONS SELECTED FROM THE GROUP CONSISTING OF SODIUM AND AMMONIUM IONS FROM WASTE LIQUOR PRODUCED IN A NEUTRAL SULFITE PULPING PROCESS AND OF PRODUCING FRESH NEUTRAL SULFITE COOKING LIQUOR CONTAINING SAID BASE IONS WHICH COMPRISES PASSING SAID WASTE LIQUOR SUCCESSIVELY THROUGH A PLURALITY OF BODIES OF CATION EXCHANGE RESINS IN THE HYDROGEN FORM, ONE OF SAID BODIES BEING A CARBOXYLIC RESIN AND THE OTHER OF SULFONIC RESIN, SAID WASTE LIQUOR BEING PASSED FIRSTLY THROUGH SAID BODY OF CARBOXYLIC RESIN AND THE EFFLUENT THEREFROM BEING PASSED THROUGH SAID BODY OF SULFONIC RESIN, AND SUBSQUENTLY PASSING A SOLUTION OF AVAILABLE SULFUROUS ACID FIRSTLY THROUGH SAID BODY OF SULFONIC RESIN AND THEN THROUGH SAID BODY OF CARBOXYLIC RESIN AND COLLECTING THE EFFLUENT FROM THE LATTER TO PROVIDE FRESH COOKING LIQUOR.
Claim 2
Independent Claim
132 words
A METHOD OF RECOVERING BASE IONS SELECTED FROM THE GROUP CONSISTING OF SODIUM AND AMMONIUM IONS FROM WASTE LIQUOR PRODUCED IN A NEUTRAL SULFITE PULPING PROCESS AND OF PRODUCING FRESH NEUTRAL SULFITE COOKING LIQUOR CONTAINING SAID BASE IONS WHICH COMPRISES PASSING SAID WASTE LIQUOR SUCCESSIVELY THROUGH A PLURALITY OF BODIES OF CATION EXCHANGE RESINS IN THE HYDROGEN FORM, ONE OF SAID BODIES BEING A CARBOXYLIC RESIN AND THE OTHER OF SULFONIC RESIN, SAID WASTE LIQUOR BEING PASSED FIRSTLY THROUGH SAID BODY OF CARBOXYLIC RESIN AND THE EFFLUENT THEREFROM BEING PASSED THROUGH SAID BODY OF SULFONIC RESIN, AND SUBSQUENTLY PASSING A SOLUTION OF AVAILABLE SULFUROUS ACID FIRSTLY THROUGH SAID BODY OF SULFONIC RESIN AND THEN THROUGH SAID BODY OF CARBOXYLIC RESIN AND COLLECTING THE EFFLUENT FROM THE LATTER TO PROVIDE FRESH COOKING LIQUOR.
References Cited (Backward Citations)
US2104501A
Cited
US2191853A
Cited
GB519848A
Cited
US2656245A
Cited
US2656249A
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US2656244A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-02-27 | 1959-08-29 | 1960-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-27 | 1963-08-29 | 1964-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-27 | 1967-08-29 | 1968-02-28 | $7700.00 | Window Closed / Lapsed |