Patent US2426547A successfully refreshed from Google Patents.
US2426547A
Expired / Lapsed
US
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Anthraquinone dyestuffs
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1944-03-29
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Granted: 1947-08-26
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Expires: 1964-03-29
Abstract
No abstract record available.
Inventors
- 👤 Buckley Gerard Dunstan
- 👤 Piggott Henry Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:00
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/26; C09B1/28; C09B1/30; C09B1/50; C09B1/52; C09B1/523; C09B1/526
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1821043A
Cited
GB276408A
Cited
US1688256A
Cited
US1820023A
Cited
GB381954A
Cited
US2029239A
Cited
GB462694A
Cited
US2077539A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-08-25 | 1951-02-24 | 1951-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-08-25 | 1955-02-24 | 1955-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-08-25 | 1959-02-24 | 1959-08-26 | $7700.00 | Window Closed / Lapsed |