Patent US2438072A successfully refreshed from Google Patents.
US2069210A
Expired / Lapsed
US
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Flavanthrone dyestuff and printing paste
Assignee: National Aniline and Chemical Co Inc
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Filing: 1936-02-21
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Granted: 1937-02-02
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Expires: 1956-02-21
Abstract
No abstract record available.
Inventors
- 👤 George M Bishop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:00
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/44; D06P1/64; D06P1/651; D06P1/65106; D06P1/65131; C; C09; C09B; C09B67/00; C09B67/0071
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) | 1940-02-02 | 1940-08-03 | 1941-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-02-02 | 1944-08-03 | 1945-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-02-02 | 1948-08-03 | 1949-02-02 | $7700.00 | Window Closed / Lapsed |