US2822358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modified sulfite waste liquor and process for its preparation
Assignee: Fort James Corp
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Filing: 1955-03-22
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Granted: 1958-02-04
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Expires: 1975-03-22
Abstract
No abstract record available.
Inventors
- 👤 William M Hearon
- 👤 Homer B Lackey
- 👤 John B Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:04
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/0007; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/03; Y10S516/05
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
THE PROCESS OF MODIFYING SULFITE WASTE LIQUOR WHICH COMPRISES HEATING AT A TEMPERATURE OF FROM 180-475*F. A MIXTURE HAVING A PH OF FROM 1.5-10 AND COMPRISING SULFITE WASTE PULPING LIQUOR CONTAINING AT LEAST ONE NITROGEN COMPOUND OF THE CLASS CONSISTING OF AMMONIA, AMMONIUM HYDROXIDE, AMMONIUM SALTS, LOWER ALIPHATIC PRIMARY AMINES, LOWER ALIPHATIC SECONDARY AMINES, MONOCYCLIC AROMATIC PRIMARY AMINERS, MONOCYCLIC AROMATIC SECONDARY AMINES, UREA, AND GUANIDINE, THE NITROGEN COMPOUND BEING PRESENT IN AMOUNT SUFFICIENT TO IMPART TO THE MIXTURE A NITROGEN CONTENT OF FROM 0.1 TO 10% BY WEIGHT, DRY SOLIDS BASIS; THE HEATING BEING COPNTINUED FOR A TIME SUFFICIENT TO INCREASE THE BROOKFIELD VISCOSITY OF THE MIXTURE AT 75*F. TO AT LEAST 350 CENTIPOISERS, 50% BY WEIGHT SOLIDS BASIS, BUT INSUFFIENT TO RENDER THE LIQUOR WATER INSOLUBLE.
Claim 2
Dependent Claim
127 words
THE PROCESS OF MODIFYING SULFITE WASTE LIQUOR WHICH COMPRISES HEATING AT A TEMPERATURE OF FROM 180-475*F. A MIXTURE HAVING A PH OF FROM 1.5-10 AND COMPRISING SULFITE WASTE PULPING LIQUOR CONTAINING AT LEAST ONE NITROGEN COMPOUND OF THE CLASS CONSISTING OF AMMONIA, AMMONIUM HYDROXIDE, AMMONIUM SALTS, LOWER ALIPHATIC PRIMARY AMINES, LOWER ALIPHATIC SECONDARY AMINES, MONOCYCLIC AROMATIC PRIMARY AMINERS, MONOCYCLIC AROMATIC SECONDARY AMINES, UREA, AND GUANIDINE, THE NITROGEN COMPOUND BEING PRESENT IN AMOUNT SUFFICIENT TO IMPART TO THE MIXTURE A NITROGEN CONTENT OF FROM 0.1 TO 10% BY WEIGHT, DRY SOLIDS BASIS; THE HEATING BEING COPNTINUED FOR A TIME SUFFICIENT TO INCREASE THE BROOKFIELD VISCOSITY OF THE MIXTURE AT 75*F. TO AT LEAST 350 CENTIPOISERS, 50% BY WEIGHT SOLIDS BASIS, BUT INSUFFIENT TO RENDER THE LIQUOR WATER INSOLUBLE.
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) | 1961-02-03 | 1961-08-05 | 1962-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-03 | 1965-08-05 | 1966-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-03 | 1969-08-05 | 1970-02-04 | $7700.00 | Window Closed / Lapsed |