US2428833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for coloration of textile materials containing organic derivative of cellulose with leuco sulfuric esters of vat dyestuffs
Assignee: Celanese Corp
•
Filing: 1942-09-19
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Granted: 1947-10-14
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Expires: 1962-09-19
Abstract
No abstract record available.
Inventors
- 👤 Cyril M Croft
- 👤 Walter H Hindle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:55
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/22; D06P1/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1968856A
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US2274751A
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GB274094A
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US2218628A
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US2182964A
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US2196270A
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GB500960A
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FR843546A
Cited
US2292433A
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US2344973A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-13 | 1951-04-14 | 1951-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-13 | 1955-04-14 | 1955-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-13 | 1959-04-14 | 1959-10-14 | $7700.00 | Window Closed / Lapsed |