US2642336A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conversion of sodium sulfide to sodium sulfite
Assignee: Individual
•
Filing: 1948-05-26
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Granted: 1953-06-16
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Expires: 1968-05-26
Abstract
No abstract record available.
Inventors
- 👤 John E Greenawalt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:53
CPC Classifications
C; C01; C01D; C01D5/00; C01D5/14; Y; Y10; Y10S; Y10S423/00; Y10S423/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
153 words
A PROCESS OF TREATING A CHARGE CONTAINING SODIUM SULPHIDE TO CONVERT THE SODIM SULPHIDE TO SODIUM SULPHITE WHICH COMPRISES PASSING SAID CHARGE IN DRY STATE THROUGH A PULVERIZING CHAMBER, PASSING AIR THROUGH SAID CHAMBER IN CONTACT WITH SAID CHARGE, MAINTAINING SAID CHARGE DRY AND PROGRESIVELY PULVERIZING AND CONTINUOUSLY AGITATING SAID CHARGE IN SAID CHAMBER THEREBY TO EXPOSE FRESH SURFACES OF SODIUM SULPHIDE TO THE OXIDIZING ACTION OF SAID AIR WHILE CONTROLLING THE TEMPERATURE IN SAID PULVERIZING CHAMBER THEREBY TO PREDETERMINED LIMITS, THEREAFTER PASSING THE PULVERIZED DRY PARTICLES WHILE PASSING AIR THERETHROUGH ANOTHER CHAMBER AND CONTINUOUSLY AGITATING SAID PARTICLES WHILE PASSING AIR THERETHROUGH IN INTIMATE CONTACT WITH SAID DRY PULVERIZED CHARGE, AND MAINTAINING THE TEMPERATURE IN SAID OTHER CHAMBER AT A TEMPERATURE SUFFICIENTLY HIGH TO OXIDIZE THE SODIUM SULPHIDE TO SODIUM SULPHITE BUT NOT HIGH ENOUGH TO FORM MORE THAN SMALL AMOUNTS OF SODIUM SULPHATE, THEREBY TO CONVERT THE SODIUM SULPHIDE TO SODIUM SULPHITE.
Claim 2
Dependent Claim
153 words
A PROCESS OF TREATING A CHARGE CONTAINING SODIUM SULPHIDE TO CONVERT THE SODIM SULPHIDE TO SODIUM SULPHITE WHICH COMPRISES PASSING SAID CHARGE IN DRY STATE THROUGH A PULVERIZING CHAMBER, PASSING AIR THROUGH SAID CHAMBER IN CONTACT WITH SAID CHARGE, MAINTAINING SAID CHARGE DRY AND PROGRESIVELY PULVERIZING AND CONTINUOUSLY AGITATING SAID CHARGE IN SAID CHAMBER THEREBY TO EXPOSE FRESH SURFACES OF SODIUM SULPHIDE TO THE OXIDIZING ACTION OF SAID AIR WHILE CONTROLLING THE TEMPERATURE IN SAID PULVERIZING CHAMBER THEREBY TO PREDETERMINED LIMITS, THEREAFTER PASSING THE PULVERIZED DRY PARTICLES WHILE PASSING AIR THERETHROUGH ANOTHER CHAMBER AND CONTINUOUSLY AGITATING SAID PARTICLES WHILE PASSING AIR THERETHROUGH IN INTIMATE CONTACT WITH SAID DRY PULVERIZED CHARGE, AND MAINTAINING THE TEMPERATURE IN SAID OTHER CHAMBER AT A TEMPERATURE SUFFICIENTLY HIGH TO OXIDIZE THE SODIUM SULPHIDE TO SODIUM SULPHITE BUT NOT HIGH ENOUGH TO FORM MORE THAN SMALL AMOUNTS OF SODIUM SULPHATE, THEREBY TO CONVERT THE SODIUM SULPHIDE TO SODIUM SULPHITE.
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) | 1956-06-15 | 1956-12-15 | 1957-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-15 | 1960-12-15 | 1961-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-15 | 1964-12-15 | 1965-06-16 | $7700.00 | Window Closed / Lapsed |