US3656955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver halide emulsion sensitized with pentathiepane
Assignee: Fujifilm Holdings Corp
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Filing: 1970-08-28
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Granted: 1972-04-18
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Expires: 1990-08-28
Abstract
Abstract A photosensitive silver halide photographic emulsion containing at least one compound selected from the group consisting of compounds having the formula WHEREIN EACH OF R1, R2, and R3 and R4 is selected from the group consisting of a hydrogen atom, an alkyl group and an aralkyl group; and wherein R1 and R2, or R3 and R4 can combine to form a cycloalkyl group, is disclosed.
Inventors
- 👤 Yoshuke Ushimaru
- 👤 Yosuke Nakajima
- 👤 Mitsunori Sugiyama
- 👤 Fumihiko Nishio
- 👤 Shigeru Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:06
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/09; G03C1/34
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
79 words
The photographic emulsion as claimed in claim 1, wherein each of R1, R2, R3 and R4 is selected from the group consisting of a hydrogen atom, a methyl group, an ethyl group, a propyl group, a butyl group, a benzyl group and a phenethyl group; and wherein R1 and R2 or R3 and R4 can combine to form a member selected from the group consisting of a cyclopentyl group, a cyclohexyl group, a cycloheptyl group and a cyclooctyl group.
Claim 2
Dependent Claim
12 words
The photographic emulsion as claimed in claim 1, wherein said compound is
Claim 3
Dependent Claim
12 words
The photographic emulsion as claimed in claim 1, wherein said compound is
Claim 4
Dependent Claim
12 words
The photographic emulsion as claimed in claim 1, wherein said compound is
Claim 5
Dependent Claim
12 words
The photographic emulsion as claimed in claim 1, wherein said compound is
Claim 6
Dependent Claim
21 words
The photographic emulsion as claimed in claim 1, wherein said emulsion contains additionally at least one compound having a thiosulfate ion.
Claim 7
Dependent Claim
27 words
The photographic emulsion as claimed in claim 7, wherein the thiosulfate compound is selected from the group consisting of sodium thiosulfate, sodium aurous thiosulfate and mixtures thereof.
Claim 8
Dependent Claim
23 words
A photosensitive element comprising a support having thereon at least a layer of the silver halide photographic emulsion as claimed in claim 1.
References Cited (Backward Citations)
US3503758A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |