Patents by Inventor Paul Callant

Paul Callant has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6503697
    Abstract: A black-and-white silver halide photographic material has been disclosed, coated on a support with at least one light-sensitive emulsion layer, comprising a spectrally sensitized prefogged direct-positive silver halide emulsion, providing peak absorption in the wavelength range from 600 nm up to 700 nm, wherein said emulsion comprises a binder and core-shell emulsion crystals having silver bromide in a total amount of at least 80 mole %, characterized in that said emulsion is spectrally sensitized with a combination of a desensitizing dye having an absorption maximum wavelength in a range from 600 nm up to 700 nm, if present as a sole dye in said emulsion, and at least one azacyanine dye having an absorption maximum at a more hypsochromic wavelength.
    Type: Grant
    Filed: June 2, 2001
    Date of Patent: January 7, 2003
    Assignee: Agfa-Gevaert
    Inventors: Kris Viaene, Paul Callant
  • Publication number: 20020192607
    Abstract: A chemically and spectrally-sensitized emulsion has been described, wherein said emulsion comprising (100) cubic silver halide grains with an average edge length of from 0.2 up to 1.5 &mgr;m, has been spectrally sensitized by addition at least three trimethine dyes: a main spectral sensitizer added in an amount of at least 85 mole % of all spectral sensitizers added, followed by adding a second spectral sensitizer in an amount of not more than 10 mole % and a third spectral sensitizer in an amount of at most 1 mole % wherein at least said main spectral sensitizer has two benzoxazole rings in its chemical structure, at least said third spectral sensitizer has two benzimidazole rings in its chemical structure and wherein the said second spectral sensitizer has a structure more sterically hindered than the structure of the other spectral sensitizers. A light-sensitive silver halide photographic film material coated with such emulsion and a radiographic screen/film combination has been described.
    Type: Application
    Filed: March 4, 2002
    Publication date: December 19, 2002
    Inventors: Kathy Elst, Paul Callant
  • Patent number: 6472137
    Abstract: A light-sensitive silver halide photographic film material has been provided, said film material comprising a transparent support and on both sides thereof at least one light-sensitive emulsion layer having spectrally and chemically sensitized tabular silver halide grains rich in silver bromide, further having silver iodide in an amount of less than 3 mole % based on silver, with two flat parallel {111} crystal faces, said grains accounting for a total projective surface of said parallel crystal faces in said emulsion of at least 50%, further having an average aspect ratio of at least 2:1, a grain thickness of from 0.05 up to 0.
    Type: Grant
    Filed: November 13, 2000
    Date of Patent: October 29, 2002
    Assignee: Agfa-Gevaert
    Inventors: Ann Verbeeck, Paul Callant, Freddy Henderickx
  • Publication number: 20020127503
    Abstract: A radiographic silver halide film material and a radiographic screen/film combination has been disclosed, said material having in at least one light-sensitive layer thereof an emulsion comprising {111} tabular silver halide grains rich in silver bromide, spectrally sensitive to irradiation in the wavelength range between 540 and 555 nm by the presence of a combination of at least one J-aggregating spectrally sensitizing cyanine dye according to the formula (I) and of at least one additional cyanine dye providing a shift of maximum absorption wavelength of said combination of less than 10 nm versus in the absence thereof, wherein said additional cyanine dye is at least one monomethine cyanine dye according to the formula (II), essentially having a solubilizing group or a latent solubilizing group, said dyes having been given in the description and in the claims of the present invention.
    Type: Application
    Filed: November 28, 2001
    Publication date: September 12, 2002
    Inventors: Kathy Elst, Paul Callant, Ilse Mans
  • Patent number: 6403276
    Abstract: A film material has been provided with emulsions comprising {111} tabular silver halide grains rich in silver bromide, spectrally sensitive to irradiation in the wavelength range shorter than 420 nm by the presence of at least one blue spectral sensitizer and of at least one azacyanine dye, the formula of which has been given in the description and in the claims. A radiographic screen/film combination or system has also been provided comprising a duplitized film sandwiched between a pair of supporting or self-supporting X-ray intensifying screens, characterized in that i) said pair of supported or self-supporting X-ray intensifying screens essentially consists of luminescent phosphor particles emitting at least 50% and more preferably at least 80% of their emitted radiation in the wavelength range shorter than 420 nm, ii) said film corresponds with the film material disclosed hereinbefore.
    Type: Grant
    Filed: April 7, 2000
    Date of Patent: June 11, 2002
    Assignee: Agfa-Gevaert
    Inventors: Kathy Elst, Paul Callant, Ann Verbeeck
  • Publication number: 20020004185
    Abstract: A black-and-white silver halide photographic material has been disclosed, coated on a support with at least one light-sensitive emulsion layer, comprising a spectrally sensitized prefogged direct-positive silver halide emulsion, providing peak absorption in the wavelength range from 600 nm up to 700 nm, wherein said emulsion comprises a binder and core-shell emulsion crystals having silver bromide in a total amount of at least 80 mole %, characterized in that said emulsion is spectrally sensitized with a combination of a desensitizing dye having an absorption maximum wavelength in a range from 600 nm up to 700 nm, if present as a sole dye in said emulsion, and at least one azacyanine dye having an absorption maximum at a more hypsochromic wavelength.
    Type: Application
    Filed: June 2, 2001
    Publication date: January 10, 2002
    Inventors: Kris Viaene, Paul Callant
  • Patent number: 6261733
    Abstract: According to the present invention, there is provided a silver salt diffusion transfer material, comprising on a hydrophilic surface of a support in the order given (i) an image receiving layer containing physical development nuclei, (ii) a photosensitive layer containing a silver halide emulsion being in water permeable relationship with said image receiving layer and (iii) a top layer containing gelatin, said silver halide emulsion being spectrally sensitized with a dye with a sensitizing maximum between 380 and 430 nm, characterized in that said top layer comprises a compound I and/or a compound II
    Type: Grant
    Filed: May 3, 2000
    Date of Patent: July 17, 2001
    Assignee: Agfa-Gevaert
    Inventors: Paul Coppens, Ludo Vervloet, Paul Callant
  • Patent number: 6200743
    Abstract: A spectrally-sensitized emulsion has been described, wherein said emulsion comprises {111} tabular silver halide grains having an average aspect ratio of at least 2 with two flat parallel {111} crystal faces accounting for a total projective surface of said parallel crystal faces in said emulsion of at least 50%, characterized in that a site-directing compound is present at said faces, satisfying the general formula I as described herein is present.
    Type: Grant
    Filed: March 22, 2000
    Date of Patent: March 13, 2001
    Assignee: AGFA-Gevaert, N.V.
    Inventors: Kathy Elst, Ann Verbeeck, Paul Callant
  • Patent number: 6074814
    Abstract: A photothermographic recording material comprising a photo-addressable thermally developable element including a substantially light-insensitive organic silver salt, photosensitive silver halide in catalytic association with the substantially light-insensitive organic silver salt, in a quantity of 0.1 to 35 mol % relative to the organic silver salt and spectrally sensitized to infra-red light with a dye, a supersensitizer for the dye, a reducing agent in thermal working relationship with the substantially light-insensitive organic silver salt and a binder, wherein the binder comprises a water soluble polymer, a water-dispersible polymer or a water soluble polymer and a water-dispersible polymer and the dye is represented by formula (I): ##STR1## wherein Z.sup.1 and Z.sup.2 independently represent S, O or Se; R.sup.1 and R.sup.
    Type: Grant
    Filed: July 8, 1997
    Date of Patent: June 13, 2000
    Assignee: Agfa-Gevaert
    Inventors: Geert Deroover, Herman Uytterhoeven, Paul Callant, Johan Loccufier
  • Patent number: 6008350
    Abstract: The present invention relates to a process for the production of cyanine dyes with their methine chain showing group (M) and the charge compensation occuring by linked end groups through transformation of cationic cyanine dyes comprising group (D) with CH-acid compounds of the following formula (I) B.sub.1 --CH.sub.2 --B.sub.2 in an inert solvent, the substituents having the significance given in the description.
    Type: Grant
    Filed: March 13, 1996
    Date of Patent: December 28, 1999
    Assignee: Agfa-Gevaert
    Inventors: Peter Roschger, Stephan Michaelis, Karin Hassenruck, Horst Berneth, Paul Callant
  • Patent number: 5989774
    Abstract: A silver halide photographic material is disclosed containing a new type of hydrazide compound represented by following general formula I, the different symbols of which are defined in the description. ##STR1## In a preferred embodiment Q is pyridinium, substituted with a propargyllic group or butynyl group.The photographic material is preferably a graphic arts recording material. High gradation and excellent hard dot quality are obtained.
    Type: Grant
    Filed: September 10, 1998
    Date of Patent: November 23, 1999
    Assignee: Agfa-Gevaert, N.V.
    Inventors: Johan Loccufier, Stefaan Lingier, Paul Callant, Sabine Emmers
  • Patent number: 5989799
    Abstract: A radiographic screen/film combination or system has been provided comprising a duplitized film sandwiched between a pair of supporting or self-supporting X-ray intensifying screens, characterized in that i) said pair of supported or self-supporting X-ray intensifying screens essentially consists of luminescent phosphor particles emitting at least 50% and more preferably at least 80% of their emitted radiation in the wavelength range shorter than 380 nm, as e.g. a niobium and gadolinium doped, monoclinic M, yttriumtantalate (MYT) phosphor corresponding to formula IYTaO.sub.4 :Gd:Nb (I),ii) said film comprises {111} tabular silver halide grains rich in silver chloride, spectrally sensitive to irradiation in the said wavelength range shorter than 380 nm by the presence of at least one azacyanine dye as a spectral sensitizer.
    Type: Grant
    Filed: June 18, 1998
    Date of Patent: November 23, 1999
    Assignee: Agfa-Gevaert. N.V.
    Inventors: Ann Verbeeck, Peter Verrept, Paul Callant, Koenraad Caron
  • Patent number: 5958667
    Abstract: A photothermographic recording material comprising a support and a photo-addressable thermally developable element containing a substantially light-insensitive organic silver salt, a reducing agent therefor in thermal working relationship therewith, photosensitive silver halide spectrally sensitized to wavelengths >700 nm with a dye and in catalytic association with the substantially light-insensitive organic silver salt and a water-soluble binder, a water-dispersible binder or a mixture of a water-soluble and a water-dispersible binder, characterized in that the photothermographic recording material has an infra-red sensitivity of less than 80 J/m.sup.2 and the dye satisfies the following test: an exposure required by a photothermographic recording material A, consisting of a polyester 100 .mu.
    Type: Grant
    Filed: July 8, 1997
    Date of Patent: September 28, 1999
    Assignee: Agfa-Gevaert
    Inventors: Geert Deroover, Paul Callant, Herman Uytterhoeven
  • Patent number: 5948600
    Abstract: The present invention relates to an infra-red laser sensitive thermographic material and to a process for forming a heat mode image using such a material.
    Type: Grant
    Filed: September 10, 1997
    Date of Patent: September 7, 1999
    Assignee: AGFA-Gevaert N.V.
    Inventors: Peter Roschger, Stephan Michaelis, Karin Hassenruck, Horst Berneth, Paul Callant, Herman Uytterhoeven, Luc Bastiaens, Guy Van Ackere
  • Patent number: 5919609
    Abstract: The synthesis and the application of new dyes is described. In particular said new dyes can be incorporated in non-migratory state in hydrophilic colloid layers of photographic materials wherefrom they can be rapidly removed after being quickly decolourised in alkaline aqueous liquids used in the processing of said materials. In photographic applications dyes of the general formula (I) are provided with at least one ionisable group which permits solubilisation in aqueous and/or alkaline medium. ##STR1## The meanings of the symbols are as defined in the claims and in the description.
    Type: Grant
    Filed: May 20, 1998
    Date of Patent: July 6, 1999
    Assignee: Agfa-Gevaert, N.V.
    Inventors: Eric Kiekens, Paul Callant
  • Patent number: 5919610
    Abstract: The synthesis and the application of new dyes is described. In particular said new dyes can be incorporated in non-migratory state in hydrophilic colloid layers of photographic materials wherefrom they can be rapidly removed after being quickly decolourised in alkaline aqueous liquids used in the processing of said materials. In photographic applications dyes of the general formula (I) are provided with at least one ionisable group which permits solubilisation in aqueous and/or alkaline medium. ##STR1## The meanings of the symbols are as defined in the claims and in the description.
    Type: Grant
    Filed: May 20, 1998
    Date of Patent: July 6, 1999
    Assignee: AGFA-Gevaert, N.V.
    Inventors: Eric Kiekens, Paul Callant
  • Patent number: 5851755
    Abstract: A photothermographic recording material comprising a photo-addressable thermally developable element containing a substantially light-insensitive organic silver salt, photosensitive silver halide in catalytic association with the substantially light-insensitive organic silver salt and spectrally sensitized to infra-red light with a dye, a supersensitizer for the dye, a reducing agent in thermal working relationship with the substantially light-insensitive organic silver salt and a binder, wherein the binder includes a water soluble polymer, a water-dispersible polymer or a water soluble polymer and a water-dispersible polymer; the dye absorbs electromagnetic radiation in the wavelength range from 700 to 1100 nm; and the supersensitizer is a stilbene compound represented by general formula (I): ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are independently hydrogen or alkyl, aryl, aralkyl, alkaryl, alkoxy or aryloxy groups; and R.sup.5, R.sup.6, R.sup.7, R.sup.8, R.sup.9, R.sup.10, R.sup.11 and R.
    Type: Grant
    Filed: July 8, 1997
    Date of Patent: December 22, 1998
    Assignee: Agfa-Gevaert
    Inventors: Herman Uytterhoeven, Johan Loccufier, Geert Deroover, Paul Callant
  • Patent number: 5811546
    Abstract: The synthesis and the application of new dyes is described. In particular said new dyes can be incorporated in non-migratory state in hydrophilic colloid layers of photographic materials wherefrom they can be rapidly removed after being quickly decolorized in alkaline aqueous liquids used in the processing of said materials. In photographic applications dyes of the general formula (I) are provided with at least one ionisable group which permits solubilization in aqueous and/or alkaline medium. ##STR1## The meanings of the symbols are as defined in the claims and in the description.
    Type: Grant
    Filed: December 26, 1996
    Date of Patent: September 22, 1998
    Assignee: Agfa-Gevaert, N.V.
    Inventors: Eric Kiekens, Paul Callant
  • Patent number: 5811545
    Abstract: The synthesis and the application of new dyes is described. In particular said new dyes can be incorporated in non-migratory state in hydrophilic colloid layers of photographic materials wherefrom they can be rapidly removed after being quickly decolorised in alkaline aqueous liquids used in the processing of said materials. In photographic applications dyes of the general formula (I) are provided with at least one ionisable group which permits solubilization in aqueous and/or alkaline medium. ##STR1## The meanings of the symbols are as defined in the claims and in the description.
    Type: Grant
    Filed: December 9, 1996
    Date of Patent: September 22, 1998
    Assignee: AGFA-Gevaert, N.V.
    Inventors: Eric Kiekens, Paul Callant
  • Patent number: 5712077
    Abstract: The present invention provides a method for making a lithographic printing plate according to the silver salt diffusion transfer process comprising the following steps:image-wise exposing with a high intensity-short time exposure with light with a wavelength between 600 nm and 700 nm an imaging element comprising on a support (1) a photosensitive layer comprising at least one photosensitive silver halide emulsion sensitized to light by means of one or more cationic carbocyanine sensitizing dye having a maximum absorption between 600 nm and 700 nm, the silver halide crystals of said silver halide emulsion comprising more than 95 mole % of silver chloride per mole of silver halide and (2) an image receiving layer comprising physical development nuclei in a water permeable relationship with said photosensitive layer,developing said imaging element using an alkaline processing liquid in the presence of (a) developing agent(s) and (a) silver halide solvent(s),characterized in that said silver halide crystals conta
    Type: Grant
    Filed: January 27, 1997
    Date of Patent: January 27, 1998
    Assignee: AGFA-Gevaert, N.V.
    Inventors: Lode Deprez, Paul Callant