Patent US2448448A successfully refreshed from Google Patents.
US2448448A
Expired / Lapsed
US
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Dyeing of textile fibers containing nitrogen
Assignee: Akzo Nobel UK PLC
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Filing: 1946-11-01
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Granted: 1948-08-31
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Expires: 1966-11-01
Abstract
No abstract record available.
Inventors
- 👤 Macgregor James Hutchison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:26
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/44; D06P1/64; D06P1/642; D06P1/6429; D06P1/649; D06P1/6494; D06P3/00; D06P3/02; D06P3/04; D06P3/14; D06P3/16
Claims Analysis
Total Claims: 0
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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) | 1951-08-31 | 1952-03-01 | 1952-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-31 | 1956-03-01 | 1956-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-31 | 1960-03-01 | 1960-08-31 | $7700.00 | Window Closed / Lapsed |