Patent US2994585A successfully refreshed from Google Patents.
US2994585A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for extracting sulphur dioxide
Assignee: —
•
Filing: —
•
Granted: 1961-08-01
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Expires: 1978-08-01
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:26
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/48; C01B17/50; C01B17/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A PROCESS FOR THE EXTRACTION OF SULPHUR DIOXIDE FROM GAS WHICH CONTAINS IT, WHICH COMPRISES CONTACTING SUCH A GAS WITH AN AQUEOUS SOLUTION OF GLYOXAL, AT A TEMPERATURE BELOW 50*C., SO AS TO RETAIN THE SULPHUR DIOXIDE IN THE FORM OF A COMPOUND WITH THE GLYOXAL, THEN HEATING SAID SOLUTION TO A TEMPERATURE ABOVE 50*C. IN ORDER TO LIBERATE THE SULPHUR DIOXIDE IN THE PRACTICALLY PURE STATE.
Claim 2
Dependent Claim
67 words
A PROCESS FOR THE EXTRACTION OF SULPHUR DIOXIDE FROM GAS WHICH CONTAINS IT, WHICH COMPRISES CONTACTING SUCH A GAS WITH AN AQUEOUS SOLUTION OF GLYOXAL, AT A TEMPERATURE BELOW 50*C., SO AS TO RETAIN THE SULPHUR DIOXIDE IN THE FORM OF A COMPOUND WITH THE GLYOXAL, THEN HEATING SAID SOLUTION TO A TEMPERATURE ABOVE 50*C. IN ORDER TO LIBERATE THE SULPHUR DIOXIDE IN THE PRACTICALLY PURE STATE.
References Cited (Backward Citations)
US2676872A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-31 | 1965-01-30 | 1965-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-31 | 1969-01-30 | 1969-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-31 | 1973-01-30 | 1973-08-01 | $7700.00 | Window Closed / Lapsed |