US2531091A
Expired / Lapsed
US
⏱️ 0.0 years remaining
N-acetonyl-pyridinium chloride as an azo coupling component in diazotypes
Assignee: Gevaert Photo Producten NV
•
Filing: 1946-07-29
•
Granted: 1950-11-21
•
Expires: 1966-07-29
Abstract
No abstract record available.
Inventors
- 👤 Andre E Van Dormael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:57
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/58
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1822065A
Cited
US2027229A
Cited
US2154918A
Cited
US2217189A
Cited
US2331326A
Cited
US2405523A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-20 | 1954-05-22 | 1954-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-20 | 1958-05-22 | 1958-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-20 | 1962-05-22 | 1962-11-21 | $7700.00 | Window Closed / Lapsed |