US3705805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic layers containing compounds which absorb ultraviolet light
Assignee: Agfa Gevaert AG
•
Filing: 1971-11-12
•
Granted: 1972-12-12
•
Expires: 1991-11-12
Abstract
Abstract A PHOTOGRAPHIC MATERIAL COMPRISING A MIXTURE OF AN UV ABSORBENT OF A BENZOTRIAZOLE COMPOUND AND A CONDENSATION COMPOUND OF HYDROXYBENZLDEHYDES OR ALKOXYBENZALDEHYDES OF HYDROXYKETONES OR ALKOXYKETONES WITH COMPOUNDS CONTAINING ACTIVE METHYLENE GROUPS HAVING A MELTING POINT BELOW 60*C.
Inventors
- 👤 Fritz Nittel
- 👤 Johannes Sobel
- 👤 Wolfgang Himmelmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:50
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/815; G03C1/8155
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) | 1975-12-12 | 1976-06-12 | 1976-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-12 | 1980-06-12 | 1980-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-12 | 1984-06-12 | 1984-12-12 | $7700.00 | Window Closed / Lapsed |