US3658547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver halide photographic emulsions containing phenozine-n-oxides desensitizers
Assignee: Fujifilm Holdings Corp
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Filing: 1970-03-06
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Granted: 1972-04-25
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Expires: 1990-03-06
Abstract
Abstract Photographic silver halide emulsion and photographic elements containing same, said elements containing certain phenazine desensitizing dyes. The dyes of this invention selectively desensitize the silver halide emulsion to visible light, as contrasted with X-rays.
Inventors
- 👤 Keisuke Shiba
- 👤 Reiichi Ohi
- 👤 Masatoshi Sugiyama
- 👤 Azusa Ohhashi
- 👤 Motohiko Tsubota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:59
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/36; Y; Y10; Y10S; Y10S430/00; Y10S430/167
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
41 words
The silver halide photographic emulsion of claim 1 wherein said compound is incorporated into the silver halide emulsion in an amount of from 1.5 X 10 4 to 1 X 10 2 mole per mole of silver halide in said emulsion.
Claim 2
Dependent Claim
27 words
A silver halide photographic light-sensitive element for X-ray photography comprising a support having thereon a layer of silver halide photographic emulsion as set forth in claim 1.
Claim 3
Dependent Claim
20 words
The silver halide photographic emulsion of claim 1, wherein said compound is a member selected from the group consisting of
Claim 4
Dependent Claim
29 words
A silver halide photographic emulsion having a reduced sensitivity to visible light and a high sensitivity to X-rays consisting essentially of a compound selected from the group consisting of
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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |