US2569418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
3-azo derivatives of 1-substituted 2, 5-diketo-7-methylpyrimidopyrazoles
Assignee: GAF Chemicals Corp
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Filing: 1948-07-09
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Granted: 1951-09-25
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Expires: 1968-07-09
Abstract
No abstract record available.
Inventors
- 👤 Henry B Kellog
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:18
CPC Classifications
C; C09; C09B; C09B39/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
6 words
THE AZO DYE HAVING THE FORMULA:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-24 | 1955-03-26 | 1955-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-24 | 1959-03-26 | 1959-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-24 | 1963-03-26 | 1963-09-25 | $7700.00 | Window Closed / Lapsed |