Patent US3689271A successfully refreshed from Google Patents.
US3689271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Incorporation process for materials used to form photographic layers
Assignee: Agfa Gevaert AG
•
Filing: 1969-04-09
•
Granted: 1972-09-05
•
Expires: 1989-04-09
Abstract
Abstract THE EMULSIFICATION OF ADDITIVES INTO A PHOTOGRAPHIC EMULSION IS STABILIZED BY COMBINING THE ADDITIVE WITH CERTAIN SECONDARY CARBOXYLIC ACIDS BEFORE THEY ARE EMULSIFIED.
Inventors
- 👤 Fritz Nitttel
- 👤 Erich Reckziegel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:07
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/388; G03C7/3885; G03C1/00; G03C1/005; G03C1/06; G03C1/38
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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |