Patents Assigned to Afga-Gevaert, N.V.
  • Patent number: 6197472
    Abstract: The present invention relates to a recording material having a substrate and a negative-working, radiation-sensitive layer which contains a diazonium salt, metal-free colored pigments dispersed in an organic polymeric binder, transparent spacer pigments having a pore volume of more than 1.0 ml/g and a polymeric binder. The predispersal of the colored pigments is achieved by milling with an organic polymeric binder containing hydroxyl groups, some or all of which have been reacted with a di- or polycarboxylic anhydride so that the binder has an acid number of from 20 to 200. Printing plates in which the printing parts have a clearly visible contrast relative to the substrate can be produced from the recording material.
    Type: Grant
    Filed: March 21, 2000
    Date of Patent: March 6, 2001
    Assignee: Afga-Gevaert N.V.
    Inventors: Klaus-Peter Konrad, Andreas Elsaesser, Frank Fischer, John Kynaston Davies
  • Patent number: 6171756
    Abstract: Organic photoprecursors of amines are provided for use in photosensitive imaging systems, finding particular application in the preparation of lithographic printing plates. Said photoprecursors generate free amines on exposure to long wavelength UV or visible radiation, have high solubility in organic solvents, and include photolabile 2-nitrobenzyl functional groups. Methods for the synthesis of the photoprecursors are described, and the use of the said photoprecursors for the production of printing plates using both positive working and negative working techniques are discussed.
    Type: Grant
    Filed: December 22, 1998
    Date of Patent: January 9, 2001
    Assignee: Afga-Gevaert, N.V.
    Inventors: Maria de Lurdes dos Santos Cristiano, John Kynaston Davies, Sharon Dowd, Robert Alexander Walker Johnstone, Michael John Pratt, John Robert Wade
  • Patent number: 5886354
    Abstract: A single sheet photostimulable phosphor screen, wherein the screen contains in consecutive order (1) a support, (2) a continuous phosphor-containing layer, and permanently and contiguously united therewith (3) a grid structured phosphor-containing layer containing a phosphor different from the phosphor contained in the continuous phosphor-containing layer (2), the grid structured layer.(3) containing parallel rows of phosphor-containing stripes, and the different phosphors have a different X-ray absorption capacity with respect to different energy levels of X-ray radiation.
    Type: Grant
    Filed: December 30, 1996
    Date of Patent: March 23, 1999
    Assignee: AFGA-Gevaert, N.V.
    Inventor: Paul Leblans
  • Patent number: 5786128
    Abstract: The present invention discloses a method for making a lithographic printing plate comprising the steps of:(1) image-wise exposing an imaging element having on a hydrophilic surface of a lithographic base a photosensitive layer comprising a photosensitive polymer containing aryl-diazosulfonate units;(2) and developing a thus obtained image-wise exposed imaging element by mounting it on a print cylinder of a printing press and supplying an aqueous dampening liquid and/or ink to said photosensitive layer while rotating said print cylinder.Excellent printing results are obtained with a printing plate perpared according to the above described method. The lithographic base may be an anodized aluminium or a support provided with an ink-repellant layer containing a cross-linked hydrophilic binder.
    Type: Grant
    Filed: September 18, 1996
    Date of Patent: July 28, 1998
    Assignee: AFGA-Gevaert, N.V.
    Inventors: Joan Vermeersch, Marc Van Damme
  • Patent number: 5624784
    Abstract: A kit of parts for preparing an alkaline processing liquid for use in preparing a lithographic printing plate according to the silver salt diffusion transfer process, and comprising all necessary active compounds for preparing said alkaline processing liquid, said active compounds being contained in parts physically separated from each other, at least one of said parts comprising an inorganic alkali in solid form and at least one of said other parts comprising a hydrophobizing agent and being substantially free from inorganic alkali.
    Type: Grant
    Filed: March 18, 1996
    Date of Patent: April 29, 1997
    Assignee: Afga-Gevaert N.V.
    Inventors: Jos Vaes, Renaat Ceulemans, Lode Deprez
  • Patent number: 5587269
    Abstract: The present invention provides a thermal imaging process using (i) a donor element comprising on a support having a thickness of 3-10 .mu.m a donor layer comprising a binder, a thermotransferable reducing agent capable of reducing a silver source to metallic silver upon heating and particles protruding from the surface of said donor layer and (ii) a receiving element comprising on a support a receiving layer comprising a silver source capable of being reduced by means of heat in the presence of a reducing agent, said thermal imaging process comprising the steps ofbringing said donor layer of said donor element into face to face relationship with said receiving layer of said receiving element,image-wise heating a thus obtained assemblage, thereby causing image-wise transfer of an amount of said thermotransferable reducing agent to said receiving element in accordance with the amount of heat supplied by said thermal head andseparating said donor element from said receiving element.
    Type: Grant
    Filed: March 8, 1995
    Date of Patent: December 24, 1996
    Assignee: Afga-Gevaert N.V.
    Inventor: Geert Defieuw
  • Patent number: 5142333
    Abstract: An electrostatic latent image developing assembly having a first feed passage for feeding developing material in a first direction, a second feed passage for feeding the developing material in a direction opposite to the first direction. A helical feed screw in the first feed passage, a helical supply screw in the second feed passsage for supplying part of the developing material to a developing sleeve, a connection between both sets of adjacent ends of such feed passages for permitting the developing material to circulate between the passages, wherein the feed screw and supply screw are disposed in parallel relation and the supply screw is provided with buckets around its periphery, the supply screw having a helical blade for advancing developing material in the second feed passage axially thereof while the buckets move the material circumferentially. Preferably, the radius of the helical blade reaches to at least one-half the depth of the buckets.
    Type: Grant
    Filed: January 11, 1991
    Date of Patent: August 25, 1992
    Assignee: Afga-Gevaert N.V.
    Inventors: Marcel F. Verbeek, Robert F. Janssens, Jan A. Zwijsen, Luc K. Van Aken, Serge M. Tavernier
  • Patent number: 4748515
    Abstract: A method and an apparatus for generating correcting signals for correcting the video output signal of an electro-optical document reading apparatus of the line-wise scanning type are disclosed. The method of the invention employs a successive approximation procedure for determining the correcting factors pertaining to pixels within each scanning line, the checking cycles of the procedures corresponding with each correction word however are nested.
    Type: Grant
    Filed: October 6, 1986
    Date of Patent: May 31, 1988
    Assignee: Afga-Gevaert N.V.
    Inventors: Jean A. Van Daele, Patrick M. Pandelaers
  • Patent number: 3980417
    Abstract: An installation for burning waste solvents is characterized by the use of a concentrically constructed nozzle by means of which the waste solvents and a mixture of compressed air and fuel may be burned simultaneously. The compressed air/fuel mixture may either serve to warm up the incinerator prior to the introduction therein of the waste solvents or may be used to support the incineration of waste solvents when the latter have a low heat value.
    Type: Grant
    Filed: November 27, 1974
    Date of Patent: September 14, 1976
    Assignee: AFGA-GEVAERT N.V.
    Inventor: Peter Gerard Dierckx
  • Patent number: 3980575
    Abstract: A toner material for use in the development of electrostatic charge patterns is described which comprises carbon black as coloring material, polystyrene as thermoplastic resin binder and at least one diester of orthophthalic or metaphthalic acid that is solid at room temperature as plasticizer, wherein the polystyrene binder has a molecular weight comprised between about 30,000 and about 70,000, the proportion by weight of the carbon black to the binder is comprised between about 5:100 and about 20:100, and the proportion by weight of the said plasticizer(s) to the binder is comprised between about 2:100 and about 15:100. The toner material is of a very simple and inexpensive composition and nevertheless has optimum photographic and physical properties.
    Type: Grant
    Filed: May 10, 1973
    Date of Patent: September 14, 1976
    Assignee: AFGA-GEVAERT N.V.
    Inventors: Pierre Richard De Roo, Jozef Leonard Van Engeland, Gaston Eduard Van der Auweraer
  • Patent number: 3980481
    Abstract: Direct-positive silver halide emulsions comprising fogged silver halide grains and an electron acceptor are described wherein the emulsion is spectrally sensitized by means of 2-aryl-indolocarbocyanines. The combination of electron acceptors and these spectral sensitizers provides super-sensitizing effects that are not impaired by the presence of color couplers.
    Type: Grant
    Filed: January 11, 1974
    Date of Patent: September 14, 1976
    Assignee: AFGA-GEVAERT N.V.
    Inventors: Theofiel Hubert Ghys, Willy Joseph Vanassche, Herman Alberik Pattyn