Patents by Inventor Adrianus M. P. Hectors

Adrianus M. P. Hectors 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).

  • Electrostatic image one-component electrically conductive thermoplastic resin containing powdered developer prepared by coagulation in emulsion
    Patent number: 4286037
    Abstract: Electrically conductive developer powder for developing electrostatic images by inductive attraction is provided, with avoidance of practical disadvantages of known "one-component" developer powders, by incorporating finely divided water-insoluble quaternary ammonium salt into thermoplastic resin particles forming the powder, with or without other finely divided additives such as coloring material and/or magnetically attractable material. The specific resistance of the resin particles is lowered to between 10.sup.7 and 10.sup.11 ohm. cm by from 8 to 35% by weight of the quaternary ammonium salt, and can be lowered further by additions of fine conductive material such as carbon black. The resin particles remain sufficiently fusible even when they also contain enough magnetically attractable material, e.g. about 50% by weight, to render them transportable by a magnetic powder-applicator.
    Type: Grant
    Filed: September 5, 1978
    Date of Patent: August 25, 1981
    Assignee: Oce-van der Grinten N.V.
    Inventors: Adrianus M. P. Hectors, Gerardus J. Crommentuyn
  • One-component developer powder and process for its preparation
    Patent number: 4146494
    Abstract: Electrically conductive developer powder for developing electrostatic images by inductive attraction is provided, with avoidance of practical disadvantages of known "one-component" developer powders, by incorporating finely divided water-insoluble quaternary ammonium salt into thermoplastic resin particles forming the powder, with or without other finely divided additives such as coloring material and/or magnetically attractable material. The specific resistance of the resin particles is lowered to between 10.sup.7 and 10.sup.11 ohm. cm by from 8 to 35% by weight of the quaternary ammonium salt, and can be lowered further by additions of fine conductive material such as carbon black. The resin particles remain sufficiently fusible even when they also contain enough magnetically attractable material, e.g. about 50% by weight, to render them transportable by a magnetic powder-applicator.
    Type: Grant
    Filed: January 7, 1977
    Date of Patent: March 27, 1979
    Assignee: Oce-van de Grinten N.V.
    Inventors: Adrianus M. P. Hectors, Gerardus J. Crommentuyn
  • Electrophotographic copying process and reproduction element
    Patent number: 4052210
    Abstract: In electrophotographic copying processes use is made of a reproduction element comprising on a conductive support a photoconductive layer containing dispersed in a binder a bisazo naphthol compound having a certain structure of substituents whereby the reproduction element exhibits relatively high light-sensitivity and is repeatedly exposable and developable imagewise so as to be useful for indirect electrophotographic copying. Special binder compositions enhance the light-sensitivity of the element and special layer constructions are provided to suit it for certain uses.
    Type: Grant
    Filed: June 30, 1976
    Date of Patent: October 4, 1977
    Assignee: Oce-van der Grinten N.V.
    Inventor: Adrianus M. P. Hectors