US3895950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic material with improved antistatic properties
Assignee: Agfa Gevaert AG
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Filing: 1974-07-16
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Granted: 1975-07-22
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Expires: 1994-07-16
Abstract
Abstract Light sensitive photographic material containing silver halide emulsion and auxiliary layers on a support one or more layers thereof contain finely divided silica particles and an orthophosphoric acid in which at least two hydroxyl groups are esterified with monoesterified or monoetherified polyalkylene glycols. The material shows improved antistatic properties.
Inventors
- 👤 Julius Geiger
- 👤 Gunter Meinhardt
- 👤 Werner Wagenknecht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:41
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/85; G03C1/856
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
53 words
A LIGHT SENSITIVE PHOTOGRAPHIC MATERIAL HAVING IMPROVED ANTISTIC PROPERTIES CONTAINING AT LEAST ONE SILVER HALIDE GELATIM EMULSION LAYER AND A LAYER CONTAINING A BINDER AND SILICA OBTAINED BY PYOGENIC METHOD AND HAVING A BET VALUE OF BETWEEN 50 AND 110M2/G AN IN SAID SILICA-CONTAINING LAYER AN ORTHOPHOSPHORIC ACID ESTER OF THE FOLLOWING FORMULA:
Claim 2
Dependent Claim
53 words
A LIGHT SENSITIVE PHOTOGRAPHIC MATERIAL HAVING IMPROVED ANTISTIC PROPERTIES CONTAINING AT LEAST ONE SILVER HALIDE GELATIM EMULSION LAYER AND A LAYER CONTAINING A BINDER AND SILICA OBTAINED BY PYOGENIC METHOD AND HAVING A BET VALUE OF BETWEEN 50 AND 110M2/G AN IN SAID SILICA-CONTAINING LAYER AN ORTHOPHOSPHORIC ACID ESTER OF THE FOLLOWING FORMULA:
Claim 3
Dependent Claim
20 words
Photographic material according to claim 1, characterised in that the silica contains 0.3 to 1.5% by weight of aluminium oxide.
Claim 4
Dependent Claim
21 words
Photographic material according to claim 1, characterised in that the silica has a particle size of between 10 and 40 nm.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |