Patents by Inventor Stefaan K. De Meutter

Stefaan K. De Meutter 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: 5344734
    Abstract: An electrophotographic recording material which comprises an electrically conductive support having thereon a photoconductive layer containing at least one aromatic amino compound having positive charge transport capacity, wherein said aromatic amino compound is within the scope of general formula (A) defined in the description.
    Type: Grant
    Filed: August 26, 1992
    Date of Patent: September 6, 1994
    Assignee: AGFA-Gevaert, N.V.
    Inventors: Marcel J. Monbaliu, David R. Terrell, Stefaan K. De Meutter
  • Patent number: 5340675
    Abstract: An electrophotographic recording material which comprises an electrically conductive support having thereon a photoconductive layer, characterized in that said layer contains one or more 1,2-dihydroquinoline compounds corresponding to the following general formula (A): ##STR1## wherein: each of R.sup.1 and R.sup.2 (same or different) represents a C.sub.1 -C.sub.6 alkyl group,Y represents a polycyclic aromatic nucleus, including said nucleus carrying one or more non-ionic substituents, andZ represents the atoms necessary to close an adjacent aromatic nucleus or ring system, including such nucleus or ring system substituted with one or more substituents of non-ionic character.
    Type: Grant
    Filed: January 14, 1993
    Date of Patent: August 23, 1994
    Assignee: AGFA-Gevaert, N.V.
    Inventors: Marcel J. Monbaliu, David R. Terrell, Stefaan K. De Meutter
  • Patent number: 5306587
    Abstract: A photosensitive recording material which comprises an electrically conductive support having thereon a layer containing a charge transporting compound (n-CTM-compound) capable of accepting and transporting electrons obtained by radiation-activated charge-generation in a charge generating compound (CGM-compound) present in said material, wherein said n-CTM-compound corresponds to a general formula (A), (B), or (C) as defined in the description.
    Type: Grant
    Filed: August 26, 1992
    Date of Patent: April 26, 1994
    Assignee: Agfa-Gevaert, N.V.
    Inventors: David R. Terrell, Frans C. De Schryver, Carina Geelen, Marcel J. Monbaliu, Stefaan K. De Meutter, Mark G. Van der Auweraer, Guy P. Verbeek
  • Patent number: 5248579
    Abstract: An electrophotographic recording material comprising on an electrically conductive support a positively chargeable photoconductive recording layer which contains in an electrically insulating organic polymeric binder material at least one photoconductive p-type pigment substance, and at least one n-type photoconductive charge transport substance selected from one of the following classes:(i) aromatic monoketones;(ii) aromatic polyketones;(iii) aromatic polyketones of (ii) condensed with at least one molecule of malonoitrile, a malononitrile monocarboxy ester or a malonic acid diester;(iv) cyano alkylene compounds;(v) aromatic compounds with at least one electron withdrawing substituent,wherein said layer has a thickness in the range of 4 to 40 .mu.m and comprises 5 to 40% by weight of said p-type pigment substance and 0.
    Type: Grant
    Filed: March 13, 1992
    Date of Patent: September 28, 1993
    Assignee: Agfa-Gevaert, N.V.
    Inventors: David R. Terrell, Stefaan K. De Meutter
  • Patent number: 5244697
    Abstract: A drum, such as a drum for an electrostatic photocopying unit, is given a uniform coating of a liquid coating composition, such as an organic photoconductor, by arranging the drum on a vertical axis coaxially with a vessel containing a body of the coating composition of a depth generally equal to the vertical length of the drum, bringing the drum and vessel into substantially telescoping relation to dip the drum substantially into the coating composition, and causing the drum and vessel to undergo relative vertical displacement along the vertical axis by the sole force of gravity to thereby bring about a progressive vertical separation of the drum from the vessel leaving a coating of the composition on the drum surface. The separation is preferably controlled at a uniform rate by means e. g. of a hydraulic cylinder supporting a movable one of the drum and vessel in opposition to the force of gravity while the gravitational force can be augmented by increasing the effective mass of the movable one.
    Type: Grant
    Filed: May 23, 1991
    Date of Patent: September 14, 1993
    Assignee: Agfa-Gevaert N.V.
    Inventors: Leo N. Vackier, Stefaan K. De Meutter
  • Patent number: 5208127
    Abstract: Photoconductive recording material which incorporates in an outermost layer a siloxane-copolymer including at least one polysiloxane block that is copolymerized with aromatic ester units or with aromatic carbonate units and aromatic ester units, wherein the polysiloxane block(s) consist(s) of 5 to 200 chemically bonded diorgano siloxy units in which the organic substituents are selected from the group consisting of an alkyl, an aralkyl, an alkaryl and an aryl group and said block(s) is (are) present in an amount by weight in the range 0.3% to 80% with respect to the total weight of said copolymer.
    Type: Grant
    Filed: November 9, 1990
    Date of Patent: May 4, 1993
    Assignee: Agfa-Gevaert, N.V.
    Inventors: David R. Terrell, Stefaan K. De Meutter, Peter Horlacher, Volker Serini, Ulrich Grigo
  • Patent number: 5208128
    Abstract: Photoconductive recording material which incorporates in an outermost layer a siloxane-copolymer including at least one polysiloxane block that is copolymerized with aromatic carbonate units, wherein the polysiloxane block(s) consist(s) of 5 to 200 chemically bonded diorgano siloxy units in which the organic substituents are selected from the group consisting of an alkyl, an aralkyl, an alkaryl and an aryl group, and said block(s) is (are) present in an amount by weight in the range of 0.3% to 6% with respect to the total weight of said copolymer.
    Type: Grant
    Filed: November 9, 1990
    Date of Patent: May 4, 1993
    Assignee: AGFA-Gevaert, N.V.
    Inventors: David R. Terrell, Stefaan K. De Meutter, Peter Horlacher, Volker Serini, Ulrich Grigo
  • Patent number: 5190817
    Abstract: A photoconductive recording material having a conducting electrode element coated with one or more layers, one or more of said layers incorporating one or more polyester carbonate copolymers, wherein the aromatic carbonate units are present in the range of 10 to 48 mole % of said copolymer and correspond to the general formulae (I), and wherein the aromatic ester units are present in the range of 52 to 90 mole % of said copolymer and have one or more of the compositions represented by the general formulae (II and III) described herein.
    Type: Grant
    Filed: November 13, 1990
    Date of Patent: March 2, 1993
    Assignee: Agfa-Gevaert, N.V.
    Inventors: David R. Terrell, Stefaan K. De Meutter, Ulrich Grigo, Volker Serini
  • Patent number: 5145759
    Abstract: An electrophotographic recording material comprising on an electrically conductive support a negatively chargeable photoconductive recording layer which contains in an electrically insulating organic polymer binder material at least one photoconductive n-type pigment substance and at least one p-type photoconductive charge transport substance as defined herein by a general formula (I) to (V), wherein said layer has a thickness in the range of 4 to 40 .mu.m and comprises 8 to 80% by weight of said n-type pigment substance and 0.01 to 40% by weight of said p-type charge transport substance that is molecularly distributed in said electrically insulating organic polymeric binder material that has a voluem resistivity of at least 10.sup.14 Ohm-m, and wherein said recording layer in electrostatically charged state requires for 10% and 90% discharge respectively exposures to conductivity increasing electromagnetic radiation that differ by a factor 4.5 or less.
    Type: Grant
    Filed: April 16, 1990
    Date of Patent: September 8, 1992
    Assignee: AGFA-Gevaert, N.V.
    Inventors: David R. Terrell, Stefaan K. De Meutter, Marcel J. Monbaliu
  • Patent number: 5137795
    Abstract: An electrophotographic recording material which comprises an electrically conductive support having thereon a photoconductive layer, characterized in that said layer contains one or more hydrazone compounds corresponding to a following general formula (I) to (II): ##STR1## wherein: R represents a homocyclic or heterocyclic group with aromatic character, including such group substituted with one or more non-ionic substituents, each of R.sup.1 and R.sup.2 (same or different) represents a C.sub.1 -C.sub.6 alkyl group,R.sup.3 represents hydrogen or a N,N-substituted --CH.dbd.hydrazono group,Z represents the atoms necessary to close an adjacent aromatic nucleus, or aromatic ring system substituted with a N,N-substituted --CH.dbd.hydrazono group, andX is a bivalent homocyclic or heterocyclic aromatic group.
    Type: Grant
    Filed: April 9, 1991
    Date of Patent: August 11, 1992
    Assignee: Agfa-Gevaert, N.V.
    Inventors: Marcel J. Monbaliu, David R. Terrell, Stefaan K. De Meutter
  • Patent number: 5134048
    Abstract: An electrophotographic recording material comprising a conductive support and a photosensitive layer containing at least one photoconductive compound that has p-type charge generating capacity and is a tetrabenzoporphyrin type compound represented by the following general formula (I): ##STR1## wherein: each of X.sup.1, X.sup.2, X.sup.3, and X.sup.4 (same or different) represents a substituent selected from the group consisting of halogen, e.g. chlorine or bromine, nitro, cyano, (C.sub.1 -C.sub.2) alkyl and alkoxy, e.g. methoxy or ethoxy or 2 X.sup.1 's, 2 X.sup.2 's, 2 X.sup.3 's or 2 X.sup.4 's together represent the atoms necessary to form a substituted or unsubstituted carbocyclic or heterocyclic ring system;k, l, m, and n each and independently represent zero or an integer 1 to 4, R.sup.1 represents hydrogen, a (C.sub.1 -C.sub.2) alkyl, aralkyl or aryl group; each of the A's (same or different) represents nitrogen, or a CR.sup.2 group, wherein each of the R.sup.
    Type: Grant
    Filed: November 9, 1990
    Date of Patent: July 28, 1992
    Assignee: Agfa-Gevaert, N.V.
    Inventors: David R. Terrell, Stefaan K. De Meutter, Bernd Kaletta
  • Patent number: 5128227
    Abstract: An electrophotographic recording material which comprises an electrically conductive support having thereon a photoconductive layer containing one or more p-type photoconductive charge transport substances, characterized in that at least one of the p-type charge transport substances is a hydrazone compound corresponding to a general formula (I) to (V) as defined in the description, and the use of a said hydrazone compound in the charge transporting layer of a bilayer-system photoconductive material comprising a charge generating layer in contiguous relationship with said charge transporting layer.
    Type: Grant
    Filed: March 25, 1991
    Date of Patent: July 7, 1992
    Assignee: Agfa-Gevaert, N.V.
    Inventors: Marcel J. Monbaliu, David R. Terrell, Stefaan K. De Meutter, Paul R. Callant
  • Patent number: 5043238
    Abstract: An electrophotographic recording material which comprises an electrically conductive support having coated thereon a layer containing at least one 1,2-dihydroquinoline compound according to one of the general formulae (I) or (II) disclosed in the description.
    Type: Grant
    Filed: March 19, 1990
    Date of Patent: August 27, 1991
    Assignee: Agfa-Gevaert, N.V.
    Inventors: Marcel J. Monbaliu, David R. Terrell, Stefaan K. De Meutter
  • Patent number: 4981768
    Abstract: An electrophotographic recording material which comprises an electrically conductive support having thereon a double layer of a charge generating layer in contiguous relationship with a charge transporting layer comprising a p-type charge transport compound corresponding to the following general formula (I): ##STR1## wherein: R.sup.1 is --NR.sup.4 R.sup.5, wherein each of R.sup.4 and R.sup.5 (same or different) represents hydrogen, an aliphatic or cycloaliphatic group including said groups in subsituted form or an aryl group, orR.sup.4 and R.sup.5 together represent the atoms necessary to complete a nitrogen-containing ring including such ring in substituted form, orR.sup.1 is N.dbd.N--Cp, wherein Cp is an azocoupler residue derived from an aromatic amine or an aromatic hydroxy compound used in azo coupling, orR.sup.1 is N.dbd.CH--R.sup.6, wherein R.sup.
    Type: Grant
    Filed: June 23, 1989
    Date of Patent: January 1, 1991
    Assignee: Agfa-Gevaert, N.V.
    Inventors: Marcel J. Monbaliu, David R. Terrell, Stefaan K. De Meutter
  • Patent number: 4923774
    Abstract: An electrophotographic recording material comprising a conductive support and a photosensitive layer containing a photoconductive compound that has p-type charge transport capacity and corresponds to the following general formula (I): ##STR1## wherein: R.sup.1 represents a --NR.sup.3 R.sup.4 group, wherein each of R.sup.3 and R.sup.4 (same or different) represents a C.sub.1 -C.sub.10 alkyl group including said alkyl group in substituted form, a cycloalkyl group, or an aryl group, andR.sup.2 represents hydrogen, an alkyl group including a substituted alkyl group or halogen.
    Type: Grant
    Filed: June 16, 1989
    Date of Patent: May 8, 1990
    Assignee: Agfa-Gevaert, N.V.
    Inventors: Mark G. Van der Auweraer, Frans C. De Schrijver, Guy P. Verbeek, Carina Geelen, David R. Terrell, Stefaan K. De Meutter