US Patent No: 6,168,903

Number of patents in Portfolio can not be more than 2000

Lithographic imaging with reduced power requirements

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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Imaging of lithographic printing plates with reduced fluence requirements is accomplished using printing members that have a solid substrate, gas-producing and radiation-absorptive layers over the substrate, and a topmost layer that contrasts with the substrate in terms of lithographic affinity. Exposure of the radiation-absorptive layer to laser light causes this layer to become intensely hot. This, in turn, activates the gas-producing layer, causing rapid evolution and expansion of gaseous decomposition products. The gases stretch the overlying topmost layer to create a bubble over the exposure region, where the imaging layers have been destroyed. If this process is sufficiently explosive, the neck of the bubble expands beyond the diameter of the incident laser beam, tearing the topmost layer and the underlying imaging layers away from the substrate outside the exposed region. The entire affected area is easily removed during a post-imaging cleaning process, resulting in an image spot larger than the incident beam diameter.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
PRESSTEK, INC.HUDSON, NH166

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Cassidy, Kenneth R Goffstown, NH 10 248
D'Amato, Richard J South Hadley, MA 9 85
Lewis, Thomas E Hampstead, NH 84 1322

Cited Art Landscape

Patent Info (Count) # Cites Year
 
PRESSTEK, INC. (7)
5,339,737 Lithographic printing plates for use with laser-discharge imaging apparatus 136 1993
5,353,705 Lithographic printing members having secondary ablation layers for use with laser-discharge imaging apparatus 69 1993
5,819,661 Method and apparatus for laser imaging of lithographic printing members by thermal non-ablative transfer 29 1995
5,704,291 Lithographic printing members with deformable cushioning layers 20 1996
5,822,345 Diode-pumped laser system and method 15 1996
5,783,364 Thin-film imaging recording constructions incorporating metallic inorganic layers and optical interference structures 19 1996
5,786,129 Laser-imageable recording constructions utilizing controlled, self-propagating exothermic chemical reaction mechanisms 24 1997
 
3M INNOVATIVE PROPERTIES COMPANY (2)
5,308,737 Laser propulsion transfer using black metal coated substrates 106 1993
5,756,689 Diazo compounds for laser-induced mass transfer imaging materials 10 1997
 
AGFA-GEVAERT N.V. (1)
5,506,085 Thermal imaging element 11 1995
 
Autotype International Limited (1)
4,588,674 Laser imaging materials comprising carbon black in overlayer 77 1983
 
E. I. DU PONT DE NEMOURS AND COMPANY (1)
5,395,729 Laser-induced thermal transfer process 36 1993
 
GRAHICS TECHNOLOGY INTERNATIONAL, INC. A CORPORATION OF DE (1)
5,156,938 Ablation-transfer imaging/recording 193 1991
 
IMPERIAL CHEMICAL INDUSTRIES PLC (1)
4,711,834 Laser-imageable assembly and process for production thereof 38 1985
 
Konica Corporation (1)
5,238,778 Method of forming printing plates by heat transfer 43 1991
 
Minnesota Mining and Manufacturing Company (1)
5,460,918 Thermal transfer donor and receptor with silicated surface for lithographic printing applications 24 1994
 
PGI GRAPHICS IMAGING LLC (1)
5,171,650 Ablation-transfer imaging/recording 222 1991

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
PRESSTEK, INC. (3)
6,378,432 Lithographic imaging with metal-based, non-ablative wet printing members 7 2000
6,374,738 Lithographic imaging with non-ablative wet printing members 12 2000
6,626,108 Lithographic imaging with metal-based, non-ablative wet printing members 0 2002
 
FUJIFILM CORPORATION (1)
6,391,522 Offset printing plate precursor and method for offset printing using the same 4 1999
 
TOKYO ELECTRON LIMITED (1)
7,661,544 Semiconductor wafer boat for batch processing 2 2007
 
W.A. WHITNEY CO. (1)
6,246,025 Insulated slag collection bed for a laser-equipped machine tool 2 1999