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# United States Patent [19J 

# Obi et al. 

# [54] PROCESS OF FORMING SUPER IDGH-CONTRAST NEGATIVE IMAGES AND SILVER HALIDE PHOTOGRAPIDC MATERIAL AND DEVELOPER BEING USED THEREFOR 

[75] Inventors: Naoki Obi, Tokyo; Yasuhiko Kojima, Saitama; Yasuo Shigemitsu, Saitama; Jun Takeuchi, Saitama; Kiyoshi Suematsu, Tokyo, all of Japan 

[73] Assignee: Dainippon Ink and Chemicals, Inc., Tokyo,Japan 

[21] Appl. No.: 278,823 

[22] Filed: Jul. 22, 1994 

[62] Division of Ser. No. 897,098, Jun. 11, 1992, Pat. No. 5,372,911. 

## [30] Foreign Application Priority Data 

<img src='content_image/926915.jpg'>

[51] Int. Cl. 6 ....................................................... G03C 1/06 

[52] U.S. Cl . .......................... 430/264; 430/442; 430/436; 430/480; 430/478; 430/487; 430/490; 430/268 

[58] Field of Search ..................................... 430/264, 442, 430/436, 480,478,487,490,268 

## Related U.S. Application Data 

<img src='content_image/926889.jpg'>

# [lll Patent Number: 5,460,919 

# [45] Date of Patent: Oct. 24, 1995 

## [56] References Cited 

Primary Examiner-Thomas R. Neville 

Attorney, Agent, or Firm-Armstrong, Westerman, Hattori, 

McLeland & Naughton 

## [57] ABSTRACT 

A process of forming a super high-contrast negative image is disclosed, which comprises the steps of imagewise expos› ing a negative-working silver halide photographic material comprising a support having thereon one or more hydro› philic colloidal layers, at least one of the one or more hydrophilic colloidal layers being a negative-working silver halide emulsion layer, and then developing the photographic material with a developer containing an aminophenol derivative developing agent and a reductone compound in the existence of an organic compound having a negative reduction potential. A negative-working silver halide pho› tographic material and a photographic developer being used for the image-forming process are also disclosed. 

<img src='content_image/926914.jpg'>

0476613 3/1992 European Pat. Off .. 

US005460919A 

## U.S. PATENT DOCUMENTS 

## FOREIGN PATENT DOCUMENTS 

## 11 Claims, No Drawings 

