US3462409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pyrazolone containing disazo dyestuffs and their metal complexes
Assignee: Hoechst AG
•
Filing: 1966-08-24
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Granted: 1969-08-19
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Expires: 1986-08-24
Abstract
No abstract record available.
Inventors
- 👤 Fritz Meininger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:58
CPC Classifications
C; C09; C09B; C09B62/00; C09B62/44; C09B62/523; C09B62/527; C09B62/443; C09B62/447; C09B62/455; C09B62/535; Y; Y10; Y10S; Y10S8/00; Y10S8/916; Y10S8/918
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3313799A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-18 | 1973-02-17 | 1973-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-18 | 1977-02-17 | 1977-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-18 | 1981-02-17 | 1981-08-19 | $7700.00 | Window Closed / Lapsed |