US3740228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light sensitive photographic material
Assignee: Agfa Gevaert AG
•
Filing: 1971-02-22
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Granted: 1973-06-19
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Expires: 1991-02-22
Abstract
Abstract ANTIHALATION AND FILTER DYES CAN ADVANTAGEOUSLY BE MORDANTED IN PHOTOGRAPHIC LAYERS BY MEANS OF MORDANTING POLYMER COMPOUNDS WHICH ARE CONDENSATION PRODUCTS OF AMINOGUANIDINE AND HOMO OR COPOLYMERS OF STYRENE DERIVATIVES CONTAINING KETO GROUPS.
Inventors
- 👤 H Ohlschlager
- 👤 W Himmelmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:04
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/388; G03C7/3882; G03C1/00; G03C1/76; G03C1/825; G03C1/835; G03C7/28; G03C8/00; G03C8/42; G03C8/52; G03C8/56
Claims Analysis
Total Claims: 0
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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) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |