US2456589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gray vat dyestuffs and method of making the same
Assignee: Wyeth Holdings LLC
•
Filing: 1944-03-23
•
Granted: 1948-12-14
•
Expires: 1964-03-23
Abstract
No abstract record available.
Inventors
- 👤 Lawrence D Lytle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:36
CPC Classifications
C; C09; C09B; C09B5/00; C09B5/24; C09B5/34; C09B5/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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GB306874A
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US1955135A
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US1845469A
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US2022240A
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CH178942A
Cited
US2031058A
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US2034629A
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US2212029A
Cited
US2251566A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-14 | 1952-06-14 | 1952-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-14 | 1956-06-14 | 1956-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-14 | 1960-06-14 | 1960-12-14 | $7700.00 | Window Closed / Lapsed |