Patent US2640758A successfully refreshed from Google Patents.
US2640758A
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Method of oxidizing sodium sulfide to sodium sulfite in successive stages
Assignee: Individual
•
Filing: 1949-02-23
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Granted: 1953-06-02
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Expires: 1969-02-23
Abstract
No abstract record available.
Inventors
- 👤 Robert S Aries
- 👤 Pollak Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:10
CPC Classifications
C; C01; C01D; C01D5/00; C01D5/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
THE METHOD OF OXIDIZING SODIUM SULFIDE TO SODIUM SULFITE IN SUCCESSIVE STAGES WHICH COMPRISES MIXING A CONCENTRATED SODIUM SULFIDE SOLUTION WITH INERT POWDERED SOLIDS TO FORM A FLUFFY, DISCONTINUOUS MASS, AGITATING AND AERATING THE MASS AT AN OXIDIZING TEMPERATURE OF ABOUT 250* F. TO 300* F. TO EFFECT OXIDATION OF SODIUM SULFIDE, AND CONTINUING THE AGITATION AND AERATION AND ADDING SUFFICIENT WATER TO THE MASS TO KEEP THE UNOXIDIZED SODIUM SULFIDE IN SOLUTION DURING THE LATER STAGES OF THE OXIDIZING TREATMENT.
Claim 2
Independent Claim
81 words
THE METHOD OF OXIDIZING SODIUM SULFIDE TO SODIUM SULFITE IN SUCCESSIVE STAGES WHICH COMPRISES MIXING A CONCENTRATED SODIUM SULFIDE SOLUTION WITH INERT POWDERED SOLIDS TO FORM A FLUFFY, DISCONTINUOUS MASS, AGITATING AND AERATING THE MASS AT AN OXIDIZING TEMPERATURE OF ABOUT 250* F. TO 300* F. TO EFFECT OXIDATION OF SODIUM SULFIDE, AND CONTINUING THE AGITATION AND AERATION AND ADDING SUFFICIENT WATER TO THE MASS TO KEEP THE UNOXIDIZED SODIUM SULFIDE IN SOLUTION DURING THE LATER STAGES OF THE OXIDIZING TREATMENT.
References Cited (Backward Citations)
US1659193A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |