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US2113054A
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Anthraquinone derivatives
Assignee: Imperial Chemical Industries Ltd
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Filing: 1937-06-23
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Granted: 1938-04-05
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Expires: 1957-06-23
Abstract
No abstract record available.
Inventors
- 👤 Lodge Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:07
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/50; C09B1/54; C09B1/547; C09B1/16; C09B1/20; C09B1/26; C09B1/32
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) | 1941-04-04 | 1941-10-04 | 1942-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-04-04 | 1945-10-04 | 1946-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-04-04 | 1949-10-04 | 1950-04-05 | $7700.00 | Window Closed / Lapsed |