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US4876180A Expired / Lapsed US ⏱️ 0.0 years remaining

Method of and apparatus for processing silver halide-containing photosensitive material for color photography

Assignee: Fujifilm Corp
•
Filing: 1988-07-12
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Granted: 1989-10-24
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Expires: 2008-07-12
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Abstract

Abstract A method of processing a silver halide-containing photosenstitive material for color photography includes the silver-removing step in which silver which is formed by reduction in the color developing step is oxidized by a bleaching agent and further changed into a soluble silver complex by the action of a fixing agent. In this process, bleaching is carried out in both a bleaching bath and a bleach-fixing bath, and fixing is effected in the bleach-fixing bath. In the bleach-fixing bath, a stream of bleach-fixing solution is brought into contact with the emulsion coating surface of the color photosensitive material at a higher flow velocity than that of a stream of bleach-fixing solution which is circulated in the bath. The time for processing carried out in the bleaching bath is set so as to be shorter than the time for processing in a bleaching bath in a conventional method wherein removal of silver is effected by the combination of a bleaching bath and a fixing bath which involves no bleaching process, and also the total time for processing carried out in the bleaching and bleach-fixing baths is set so as to be shorter than the total time for processing in the bleaching and fixing baths in said conventional method. As bleaching and fixing agents, a ferric aminopolycarboxylic acid complex and a thiosulfate are particularly effectively employed, respectively.

Inventors

  • 👤 Akira Abe
  • 👤 Junya Nakajima
  • 👤 Haruo Takase
  • 👤 Kazushige Uenaka
  • 👤 Ruyzi Otomo

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-09 11:43
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/42

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 94 words
An apparatus for processing a silver halide-containing photosensitive material for color photography, comprising: a bleaching bath tank; a bleach-fixing bath tank provided downstream of said bleaching bath tank; and bath solution jetting means for jetting bleaching-fixing solution to bring a stream of bleaching-fixing solution in contact with the emulsion coating surface of said photosensitive material in said bleaching-fixing bath tank at a flow velocity which is greater than the flow velocity of bleaching-fixing solution which is circulated in said bleach-fixing bath tank whereby the rate of silver removal of said photosensitive material is increased.
Claim 2
Independent Claim 94 words
An apparatus for processing a silver halide-containing photosensitive material for color photography, comprising: a bleaching bath tank; a bleach-fixing bath tank provided downstream of said bleaching bath tank; and bath solution jetting means for jetting bleaching-fixing solution to bring a stream of bleaching-fixing solution in contact with the emulsion coating surface of said photosensitive material in said bleaching-fixing bath tank at a flow velocity which is greater than the flow velocity of bleaching-fixing solution which is circulated in said bleach-fixing bath tank whereby the rate of silver removal of said photosensitive material is increased.
Claim 3
Dependent Claim 46 words
A processing apparatus according to claim 1, wherein said bath solution jetting means includes means having a chamber provided in said bleach-fixing bath tank, said jetting means being provided in a side wall of said chamber which faces the emulsion coating surface of said photosensitive material.
Claim 4
Dependent Claim 87 words
A processing apparatus according to claim 1, further comprising a rotary roller installed within said bleach-fixing bath tank so as to face the emulsion coating surface of said photosensitive material, said roller being rotated at a peripheral speed higher than the flow velocity of a stream of bath solution circulated in said bleach-fixing bath tank so that a stream of bath solution is brought into contact with the emulsion coating surface of said photosensitive material at relatively high speed by virtue of the rotation of said roller.
Claim 5
Dependent Claim 49 words
A processing apparatus according to claim 2, wherein the direction of a jet of bath solution which is jetted out from said jetting means provided in said chamber toward the emulsion coating surface of said photosensitive material is set so as to be perpendicular to said emulsion coating surface.
Claim 6
Dependent Claim 32 words
A processing apparatus according to claim 2, wherein said jetting means has a plurality of nozzles provided in a side wall thereof which faces the emulsion coating surface of said photosensitive material.
Claim 7
Dependent Claim 29 words
A processing apparatus according to claim 2, wherein said chamber is arranged so that the bath solution in said bleach-fixing bath tank is introduced thereinto by means of suction.

References Cited (Backward Citations)

US4756918A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1992-10-23 1993-04-24 1993-10-24 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1996-10-23 1997-04-24 1997-10-24 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2000-10-23 2001-04-24 2001-10-24 $7700.00 Window Closed / Lapsed

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