US2383236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anthraquinone derivatives
Assignee: Imperial Chemical Industries Ltd
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Filing: 1942-06-13
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Granted: 1945-08-21
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Expires: 1962-06-13
Abstract
No abstract record available.
Inventors
- 👤 Buckley Gerard Dunstan
- 👤 Piggott Henry Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:02
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/26; C09B1/28; C09B1/285
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1948-08-20 | 1949-02-19 | 1949-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-08-20 | 1953-02-19 | 1953-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-08-20 | 1957-02-19 | 1957-08-21 | $7700.00 | Window Closed / Lapsed |