US3366534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Complete chemical system for a kraft mill
Assignee: Hooker Chemical Corp
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Filing: 1964-08-14
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Granted: 1968-01-30
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Expires: 1984-08-14
Abstract
No abstract record available.
Inventors
- 👤 Rapson William Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:22
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/0035; C; C01; C01B; C01B11/00; C01B11/02; C01B11/022; C01B11/023; C01B11/025; D21C9/00; D21C9/10; D21C9/12; D21C9/14; Y; Y10; Y10S; Y10S162/00; Y10S162/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
A PROCESS FOR THE PRODUCTION OF CHEMICALS FOR THE PULPING AND BLEACHING OF CELLULOSIC MATERIALS COMPRISING REACTING SODIUM CHLORATE, SODIUM CHLORIDE AND SULFURIC ACID TO PRODUCE CHLORINE, CHLORINE DIOXIDE AND A SODIUM SULFATE SALT, SEPARATING THE CHLORINE AND CHLORINE DIOXIDE FROM SAID SALT, BLEACHING DISGESTED CELLULOSIC PLUP WITH SAID CHLORINE AND CHLORINE DIOXIDE, ADDDING THE SODIUM SULFATE SALT TO KRAFT BLACK LIQUOR PRODUCED IN THE DIGESTION OF SAID CELLULOSIC PUMP, HEATING AND SMELTING SAID KRAFT BLACK LIQUOR TO PRODUCE SODIUM CARBONATE AND SODIUM SULFIDE, DISSOLVING THE PRODUCED SODIUM CARBONATE AND SODIUM SULFIDE IN AN AQUEOUS SOLUTION, REACTING THE DISSOLVED SODIUM CARBONATE AND SODIUM SULFIDE WITH LIME TO PRODUCE WHITE LIQUOR, SEPARATING THE WHITE LIQUOR INTO SEPARATE PORTIONS, EXTRACTING PARTIALLY BLEACHED PULP WITH ONE PORTION OF SAID WHITE LIQUOR AND RETURNING ANOTHER PORTION OF SAID WHITE LIQUOR TO A KRAFT DIGESTION PROCESS AND DIGESTING CELLULOSIC PULP TO PRODUCE DIGESTED CELLULOSIC PULP AND BLACK LIQUOR FOR THE AFOREMENTIONED HEATING AND SMELTING STEP.
Claim 2
Dependent Claim
160 words
A PROCESS FOR THE PRODUCTION OF CHEMICALS FOR THE PULPING AND BLEACHING OF CELLULOSIC MATERIALS COMPRISING REACTING SODIUM CHLORATE, SODIUM CHLORIDE AND SULFURIC ACID TO PRODUCE CHLORINE, CHLORINE DIOXIDE AND A SODIUM SULFATE SALT, SEPARATING THE CHLORINE AND CHLORINE DIOXIDE FROM SAID SALT, BLEACHING DISGESTED CELLULOSIC PLUP WITH SAID CHLORINE AND CHLORINE DIOXIDE, ADDDING THE SODIUM SULFATE SALT TO KRAFT BLACK LIQUOR PRODUCED IN THE DIGESTION OF SAID CELLULOSIC PUMP, HEATING AND SMELTING SAID KRAFT BLACK LIQUOR TO PRODUCE SODIUM CARBONATE AND SODIUM SULFIDE, DISSOLVING THE PRODUCED SODIUM CARBONATE AND SODIUM SULFIDE IN AN AQUEOUS SOLUTION, REACTING THE DISSOLVED SODIUM CARBONATE AND SODIUM SULFIDE WITH LIME TO PRODUCE WHITE LIQUOR, SEPARATING THE WHITE LIQUOR INTO SEPARATE PORTIONS, EXTRACTING PARTIALLY BLEACHED PULP WITH ONE PORTION OF SAID WHITE LIQUOR AND RETURNING ANOTHER PORTION OF SAID WHITE LIQUOR TO A KRAFT DIGESTION PROCESS AND DIGESTING CELLULOSIC PULP TO PRODUCE DIGESTED CELLULOSIC PULP AND BLACK LIQUOR FOR THE AFOREMENTIONED HEATING AND SMELTING STEP.
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) | 1971-01-29 | 1971-07-31 | 1972-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-29 | 1975-07-31 | 1976-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-29 | 1979-07-31 | 1980-01-30 | $7700.00 | Window Closed / Lapsed |