Patent US1342802A successfully refreshed from Google Patents.
Patent US3305307A successfully refreshed from Google Patents.
US3305307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of solid alkali metal sulfites
Assignee: BASF SE
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Filing: 1960-09-16
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Granted: 1967-02-21
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Expires: 1980-09-16
Abstract
No abstract record available.
Inventors
- 👤 Spormann Walter
- 👤 Heinke Joachim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:02
CPC Classifications
C; C01; C01D; C01D5/00; C01D5/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A PROCESS FOR THE PRODUCTION OF SOLID ALKALI METAL SULFITE WHICH COMPRISES: PASSING A FINELY DISPERSED AQUEOUS SOLUTION OF AN ALKALI METL COMPOUND SELECTED FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE, SODIUM CARBONATE, SODIUM BICARONATE, POTASSIUM HYDROXIDE, POTASSIUM CARBONATE, POTASSIUM BICARBONATE AND MIXTURES THEREOF, INTO A SUBSTANTIALLY DRY GAS CONTAINING SULLFUR DIOXIDE, MAINTAINING THE TEMPERATURE OF SAID DRY GAS AT A LEVEL SUCH THAT THE WATER INTRODUCED WITHTHE SOLUTION AND FORMED BY THE REACTION OF THE ALKALI METAL AND THE SULFUR DIOXIDE IS IMMEDIATELY VAPORIZED, AND THEREAFTER SEPARATING FROM THE GAS THE SOLID ALKALI METAL SULFITE WHICH IS FORMED BY THE REACTION OF THE SULFUR DIOXIDE AND THE ALKALI METAL COMPOUND.
Claim 2
Dependent Claim
111 words
A PROCESS FOR THE PRODUCTION OF SOLID ALKALI METAL SULFITE WHICH COMPRISES: PASSING A FINELY DISPERSED AQUEOUS SOLUTION OF AN ALKALI METL COMPOUND SELECTED FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE, SODIUM CARBONATE, SODIUM BICARONATE, POTASSIUM HYDROXIDE, POTASSIUM CARBONATE, POTASSIUM BICARBONATE AND MIXTURES THEREOF, INTO A SUBSTANTIALLY DRY GAS CONTAINING SULLFUR DIOXIDE, MAINTAINING THE TEMPERATURE OF SAID DRY GAS AT A LEVEL SUCH THAT THE WATER INTRODUCED WITHTHE SOLUTION AND FORMED BY THE REACTION OF THE ALKALI METAL AND THE SULFUR DIOXIDE IS IMMEDIATELY VAPORIZED, AND THEREAFTER SEPARATING FROM THE GAS THE SOLID ALKALI METAL SULFITE WHICH IS FORMED BY THE REACTION OF THE SULFUR DIOXIDE AND THE ALKALI METAL COMPOUND.
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) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |