US2453410A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acid treatment of anthraquinonethiazole vat dyestuffs
Assignee: Wyeth Holdings LLC
•
Filing: 1944-03-13
•
Granted: 1948-11-09
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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
2026-11-03 19:28
CPC Classifications
C; C09; C09B; C09B5/00; C09B5/24; C09B5/30; D; D06; D06P; D06P1/00; D06P1/22
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-09 | 1952-05-10 | 1952-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-09 | 1956-05-10 | 1956-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-09 | 1960-05-10 | 1960-11-09 | $7700.00 | Window Closed / Lapsed |