Patent US3794493A successfully refreshed from Google Patents.
US3794493A
Expired / Lapsed
US
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Photographic layers which contain uv-absorbers
Assignee: Agfa Gevaert AG
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Filing: 1971-06-17
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Granted: 1974-02-26
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Expires: 1991-06-17
Abstract
Abstract THE LIGHT STABILITY OF COLOR PHOTOGRAPHIC IMAGES IS IMPROVED BY COVERCOATING THE IMAGE CARRYING LAYER WITH A UVPROTECTIVE COATING WHICH CONTAINS A UV-ABSORBING COMPOUND. THE UV-ABSORBING LAYER CONTAINS AS UV-ABSORBENT A 2-PHENOLBENZOTRIAZOLE, THE BENZO RING OF WHICH IS SUBSTITUTED WITH 2 BUTYL GROUPS.
Inventors
- 👤 J Sobel
- 👤 F Nittel
- 👤 W Pelz
- 👤 W Himmelmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:15
CPC Classifications
C; C07; C07D; C07D249/00; C07D249/16; C07D249/18; C07D249/20; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3467; C08K5/3472; C08K5/3475; C09; C09K; C09K15/00; C09K15/04; C09K15/30; D; D06; D06M; D06M13/00; D06M13/322; D06M13/35
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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |