发明名称 |
Photographic emulsions and elements capable of forming direct-positive images |
摘要 |
Silver halide emulsions are disclosed containing silver halide grains capable of forming an internal latent image. Incorporated in the emulsions as a nucleating agent is a dihydrospiropyran bis-condensation product of salicylic aldehyde and at least one heterocyclic ammonium salt, thereby permitting a direct-positive image to be formed on imagewise exposure and photographic processing.
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申请公布号 |
US4306017(A) |
申请公布日期 |
1981.12.15 |
申请号 |
US19800207814 |
申请日期 |
1980.11.17 |
申请人 |
EASTMAN KODAK COMPANY |
发明人 |
BARALLE, ROGER M.;COMPERE, MARCEL A.;PFAFF, MAURICE E.;JORDI, FREDERIC X.;GOUMONT, CLAUDE G. |
分类号 |
G03C1/485;(IPC1-7):G03C5/24 |
主分类号 |
G03C1/485 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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