Laser-imageable lithographic printing members
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United States of America Patent
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Dec 7, 1999
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app pub date -
Feb 11, 1997
filing date -
Jul 20, 1992
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Abstract
Apparatus and methods for imaging lithographic plates using laser devices that emit in the near-infrared region, and plates suitable for imaging with the apparatus and methods. Laser output either ablates one or more plate layers or physically transforms a surface layer, in either case resulting in an imagewise pattern of features on the plate. The image features exhibit an affinity for ink or an ink-abhesive fluid that differs from that of unexposed areas.
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