Patent US2773740A successfully refreshed from Google Patents.
US2773740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for the continuous production of aqueous solutions of sodium hydrosulfite from sodium amalgam and gaseous so2
Assignee: Montedison SpA
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Filing: 1953-03-19
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Granted: 1956-12-11
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Expires: 1973-03-19
Abstract
No abstract record available.
Inventors
- 👤 Battarra Marie Elisa
- 👤 Battarra Alberto
- 👤 Frigeri Luigi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:38
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/64; C01B17/66
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
75 words
THE PROCESS OF PRODUCING AN AQUEOUS SOLUTION OF SODIUM HYDROSULFITE WHICH COMPRISES REACTING AN AQUEOUS BUFFER SOLUTION OF SODIUM SULFITE AND BISULFITE WITH SODIUM AMALGAM AND GASEOUS SO2 ON DISTINCT AND SEPARATE CONTACT SURFACES IN RAPID RELATIVE MOVEMENT, THE CONTACT SURFACE BETWEEN SAID SOLUTION AND SAID SODIUM AMALGAM BEING THAT OF A CIRCULAR PERIPHERAL RING AND THE CONTACT SURFACE BETWEEN SAID SOLUTION AND SAID GASEOUS SO2 BEING THAT OF A FRUSTUM OF A ROTATION PARABOLOID,
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) | 1959-12-11 | 1960-06-11 | 1960-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-11 | 1964-06-11 | 1964-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-11 | 1968-06-11 | 1968-12-11 | $7700.00 | Window Closed / Lapsed |