US2763531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of sodium thiosulphate from sodium sulfite and sulfur in presence of cationic surface active organic bromides
Assignee: Eastman Kodak Co
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Filing: 1952-11-29
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Granted: 1956-09-18
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Expires: 1972-11-29
Abstract
No abstract record available.
Inventors
- 👤 Levenson Gerald Isaa Pasternak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:49
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
THE METHOD OF RAPIDLY MAKING SODIUM THIOSULFATE WHICH COMPRISES DIGESTING SODIUM SULFITE WITH SULFUR IN AQUEOUS SOLUTION IN THE PRESENCE OF A CATIONIC SURFACE ACTIVE AGENT SELECTED FROM THE GROUP CONSISTING OF OCTYL PYRIDINIUM BROMIDE, CETYL PYRIDINIUM BROMIDE, AND DODECYL PYRIDINIUM BROMIDE AT A TEMPERATURE WITHIN THE RANGE OF 85* C. TO THE BOILING POINT OF THE SOLUTION.
Claim 2
Independent Claim
58 words
THE METHOD OF RAPIDLY MAKING SODIUM THIOSULFATE WHICH COMPRISES DIGESTING SODIUM SULFITE WITH SULFUR IN AQUEOUS SOLUTION IN THE PRESENCE OF A CATIONIC SURFACE ACTIVE AGENT SELECTED FROM THE GROUP CONSISTING OF OCTYL PYRIDINIUM BROMIDE, CETYL PYRIDINIUM BROMIDE, AND DODECYL PYRIDINIUM BROMIDE AT A TEMPERATURE WITHIN THE RANGE OF 85* C. TO THE BOILING POINT OF THE SOLUTION.
References Cited (Backward Citations)
US1636106A
Cited
US1854847A
Cited
GB365999A
Cited
US1854762A
Cited
US2080654A
Cited
GB469147A
Cited
US2412607A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-18 | 1960-03-19 | 1960-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-18 | 1964-03-19 | 1964-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-18 | 1968-03-19 | 1968-09-18 | $7700.00 | Window Closed / Lapsed |