Patent US2692262A successfully refreshed from Google Patents.
US2692262A
Expired / Lapsed
US
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Sulfurized leuco-indophenol dyestuffs and process for their production
Assignee: Novartis AG
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Filing: 1952-03-11
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Granted: 1954-10-19
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Expires: 1972-03-11
Abstract
No abstract record available.
Inventors
- 👤 Bosshard Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:50
CPC Classifications
C; C09; C09B; C09B49/00; C09B49/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
A BLUE SULPHUR DYESTUFF OBTAINED BY REACTING AT 100-140* C. WITH AN ALKALI POLYSULPHIDE OF FORMULA ME2SX, WHEREIN ME STANDS FOR THE ALKALI METAL AND THE NUMERICAL RELATIONSHIP OF ME2S TO S RANGES FROM 1:3 1:7, IN THE PRESENCE OF AN ORGANIC SOLVENT THE LEUCO COMPOUND OF INDOPHENOL CORRESPONDING TO THE FORMULA:
Claim 2
Dependent Claim
52 words
A BLUE SULPHUR DYESTUFF OBTAINED BY REACTING AT 100-140* C. WITH AN ALKALI POLYSULPHIDE OF FORMULA ME2SX, WHEREIN ME STANDS FOR THE ALKALI METAL AND THE NUMERICAL RELATIONSHIP OF ME2S TO S RANGES FROM 1:3 1:7, IN THE PRESENCE OF AN ORGANIC SOLVENT THE LEUCO COMPOUND OF INDOPHENOL CORRESPONDING TO THE FORMULA:
References Cited (Backward Citations)
US1449681A
Cited
US2083891A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-18 | 1958-04-19 | 1958-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-18 | 1962-04-19 | 1962-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-18 | 1966-04-19 | 1966-10-19 | $7700.00 | Window Closed / Lapsed |