US2473015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acid treatment of heterocyclic imide and imidazole vat dyestuffs
Assignee: Wyeth Holdings LLC
•
Filing: 1944-03-13
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Granted: 1949-06-14
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Expires: 1964-03-13
Abstract
No abstract record available.
Inventors
- 👤 John F Cullinan
- 👤 Lawrence D Lytle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:20
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0001; C09B67/0017; C09B5/00; C09B5/62; C09B57/00; C09B57/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2065928A
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US2278973A
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US1145934A
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US1765662A
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US1929847A
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GB341357A
Cited
US1888624A
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US1888625A
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US2131419A
Cited
US2284685A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-13 | 1952-12-13 | 1953-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-13 | 1956-12-13 | 1957-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-13 | 1960-12-13 | 1961-06-14 | $7700.00 | Window Closed / Lapsed |