US3558316A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic material containing an optical brightening agent
Assignee: Agfa Gevaert AG
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Filing: 1968-07-09
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Granted: 1971-01-26
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Expires: 1988-07-09
Abstract
Abstract A PHOGRAPHIC MATERIAL WHICH CONTAINS A WATER-INSOLUBLE OPTICAL BRIGHTENING AGENT MIXED WITH AN ANIONIC POLYURETHANE HETEROGENEOUSLY DISPERSED IN A GELATIN LAYER. THIS INVENTION RELATES TO PHOTOGRAPHIC MATERIAL WHICH CONTAINS AN OPTICAL BRIGHTENING AGENT AND WHICH COMPRISES AT LEAST ONE GELATIN-CONTAINING PHOTOGRAPHIC LAYER THE PHYSICAL PROPERTIES OF WHICH ARE IMPROVED BY THE USE OF WATER-INSOLUBLE OPTICAL BRIGHTENING AGENTS CONTAINED IN ANIONIC POLYURETHANES WHICH SERVE AS CARRIERS.
Inventors
- 👤 Wolfgang Keberle
- 👤 Werner Verburg
- 👤 Friedhelm Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:01
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/815; C; C08; C08L; C08L75/00; C08L75/04; Y; Y10; Y10S; Y10S430/00; Y10S430/134
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |