Patent DE179538C successfully refreshed from Google Patents.
US1975166A
Expired / Lapsed
US
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Azo dyes and method for their preparation
Assignee: Imperial Chemical Industries Ltd
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Filing: 1933-06-08
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Granted: 1934-10-02
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Expires: 1953-06-08
Abstract
No abstract record available.
Inventors
- 👤 Mendoza Mordecai
- 👤 Hannon John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:49
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0033; C09B67/0046; C09B33/00; C09B33/18; C09B33/22
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) | 1937-10-01 | 1938-04-02 | 1938-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-10-01 | 1942-04-02 | 1942-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-10-01 | 1946-04-02 | 1946-10-02 | $7700.00 | Window Closed / Lapsed |