US1539347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azo dyes of the pyrazolone series and process of making same
Assignee: Sandoz AG
•
Filing: 1925-02-04
•
Granted: 1925-05-26
•
Expires: 1945-02-04
Abstract
No abstract record available.
Inventors
- 👤 Boeniger Melchior
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:55
CPC Classifications
C; C09; C09B; C09B29/00; C09B29/34; C09B29/36; C09B29/3604; C09B29/3647; C09B29/3652; C09B29/366
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1928-05-25 | 1928-11-24 | 1929-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-05-25 | 1932-11-24 | 1933-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-05-25 | 1936-11-24 | 1937-05-26 | $7700.00 | Window Closed / Lapsed |