Patents by Inventor Ludo Joly

Ludo Joly 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).

  • Direct electrostatic printing device which uses a gas stream to provide a cloud of toner particles
    Patent number: 5984443
    Abstract: A DEP device is provided that comprises a back electrode (105), a printhead structure (106), an array of printing apertures (107) in the printhead structure (106) through which a particle flow can be electrically modulated by a control electrode (106a), a toner delivery means (101), presenting a cloud (100) of dry toner particles in the vicinity of the apertures (107), characterized in that the toner cloud (100) is formed in the vicinity of the apertures (107) by means of a gas stream. The toner cloud is formed by detaching toner particles from a charged toner conveyer by the gas stream, or by forming a fluidized bed of toner particles.
    Type: Grant
    Filed: September 12, 1996
    Date of Patent: November 16, 1999
    Assignee: Agfa-Gevaert
    Inventors: Guido Desie, Ludo Joly, Luc Van Aken, Jacques Leonard, Frans Backaljauw, Andre Van Geyte
  • Direct electrostatic printing device wherein the speeds of a magnetic brush and a receiving substrate are related to each other
    Patent number: 5900893
    Abstract: There is provided a device for direct electrostatic printing comprising a back electrode (105), a printhead structure (106), an array of printing apertures (107) in said printhead structure (106) through which a particle flow can be electrically modulated by a control electrode (106a), an image receiving substrate (109) travelling between said back electrode (105) and said printhead structure (106) in the direction of arrow A and toner delivery means (101), comprising a charged toner conveyer (103), the reference surface of said charged toner conveyer being placed at a distance B (in mm) from the front of said printhead structure (106), and a magnetic brush to provide charged toner on to the CTC, wherein the linear surface speed of the magnetic brush LSM has a specified minimal ratio versus the travelling speed LSS of the image receiving substrate, such that LSM/LSS.gtoreq.0.5.
    Type: Grant
    Filed: April 19, 1996
    Date of Patent: May 4, 1999
    Assignee: Agfa-Gevaert
    Inventors: Ludo Joly, Dirk Broddin, Guido Desie
  • Toner particles comprising specified polymeric beads in the bulk of the toner particles
    Patent number: 5837416
    Abstract: Toner particles are provided, having an average volume diameter d.sub.vt and comprising a binder resin with melting point TSM.sub.t, and comprising polymeric beads incorporated in the bulk of the toner particles, characterized in that the polymeric beads have i) a melting point TSM.sub.p in .degree.C., such that TSM.sub.p .gtoreq.TSM.sub.t +10.degree. C. and ii) an average volume diameter d.sub.vp such that 0.20.ltoreq.d.sub.vp /d.sub.vt .ltoreq.0.75.
    Type: Grant
    Filed: June 5, 1997
    Date of Patent: November 17, 1998
    Assignee: Agfa-Gevaert, N.V.
    Inventors: Serge Tavernier, Ronny De Clercq, Ludo Joly, Werner Op de Beeck