Patent US3312552A successfully refreshed from Google Patents.
US3312552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spot prevention in light-sensitive silver halide emulsion layers
Assignee: Agfa Gevaert NV
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Filing: 1964-08-10
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Granted: 1967-04-04
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Expires: 1984-08-10
Abstract
No abstract record available.
Inventors
- 👤 Muller-Bardorff Wolfgang
- 👤 Behr Rolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:33
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/33
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
A PHOTOGRAPHIC MATERIAL CONTAINING AT LEAST ONE SUPPORTED LIGHT-SENSITIVE SILVER HALIDE EMULSION LAYER, THE SAID MATERIAL CONTAINS AS AN ANTISTAIN AGENT AN EFFECTIVE AMOUNT OF AN O-HYDROXYBENZYLAMINE, THE AMINO GROUP OF WHICH IS SUBSTITUTED BY 2 ALKYL RADICALS CONTAINING CARBOXYL GROUPS.
Claim 2
Dependent Claim
41 words
A PHOTOGRAPHIC MATERIAL CONTAINING AT LEAST ONE SUPPORTED LIGHT-SENSITIVE SILVER HALIDE EMULSION LAYER, THE SAID MATERIAL CONTAINS AS AN ANTISTAIN AGENT AN EFFECTIVE AMOUNT OF AN O-HYDROXYBENZYLAMINE, THE AMINO GROUP OF WHICH IS SUBSTITUTED BY 2 ALKYL RADICALS CONTAINING CARBOXYL GROUPS.
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) | 1970-04-03 | 1970-10-03 | 1971-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-03 | 1974-10-03 | 1975-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-03 | 1978-10-03 | 1979-04-04 | $7700.00 | Window Closed / Lapsed |