Magnetic Imaging Patents (Class 430/39)
  • Patent number: 9116448
    Abstract: Provided is a toner exhibiting satisfactory fixability even in high-speed fixing process involving a double-sided printing mechanism, keeping stable toner image even after a conveyance step, and doesn't cause curling to a fixing roller even in thin paper. In a toner including toner particles, each of which contains polyester resins A and B, a coloring agent, and a resin composition C, the resin A includes a crystal nucleating agent bonded to a polyester molecular chain including a moiety capable of forming a crystalline structure. The resin B doesn't include a moiety capable of forming a crystalline structure. The composition C is obtained by copolymerizing a vinyl-based resin component with a polyolefin resin component. SP values the resin A, the resin B, the agent, the polyolefin component, and the vinyl-based component satisfy the particular relationships.
    Type: Grant
    Filed: June 19, 2013
    Date of Patent: August 25, 2015
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Kazuo Terauchi, Shuhei Moribe, Kosuke Fukudome, Satoshi Mita, Yojiro Hotta, Tetsuya Ida
  • Patent number: 8848992
    Abstract: The invention relates to a method of determining a susceptibility gradient map, the method comprising acquiring (300) a magnetic resonance k-space dataset, said dataset comprising magnetic resonance echo data, wherein a recursive iteration is used to determine the susceptibility gradient map. Further, the invention relates to a method of determining a susceptibility gradient map, the method comprising acquiring a magnetic resonance k-space dataset, said dataset comprising magnetic resonance echo data, wherein the acquired dataset comprises magnetic resonance echo data of multiple echoes with different echo times, wherein a susceptibility gradient map is determined separately for each echo time resulting in a temporary susceptibility gradient map, wherein the method further comprises calculating a total susceptibility gradient map by combining all determined temporary susceptibility gradient maps.
    Type: Grant
    Filed: January 19, 2011
    Date of Patent: September 30, 2014
    Assignee: Koninklijke Philips N.V.
    Inventors: Julien Senegas, Thomas Perkins
  • Patent number: 8431911
    Abstract: A method and apparatus for manufacturing magnetic storage media is provided. A structural substrate is coated with a magnetically active material, and a magnetic pattern is formed in the magnetically active material by treating portions of the material with energy from a laser, e-beam, or focused ion beam. The beam may be divided into a packet of beamlets by passing the beam through a divider, which may be a diffraction grating for laser energy, a thin film single crystal for electrons, or a perforated plate for ions, or the beam may be generated by an array of emitters. The beamlets are then focused to a desired dimension and distribution by optics or electric fields. The resulting beam packet may be shaped further by passing through an aperture of any desired shape. The resulting beam may be applied sequentially to exposure zones to treat an entire substrate or plurality of substrates.
    Type: Grant
    Filed: April 13, 2010
    Date of Patent: April 30, 2013
    Assignee: Applied Materials, Inc.
    Inventors: Majeed A. Foad, Stephen Moffatt
  • Patent number: 7916920
    Abstract: A magnetic resonance tomograph is provided with a magnetic resonance system comprising at least two high-frequency transmitting/receiving units, each containing 1) a high-frequency transmitting/receiving coil, 2) a high-frequency current source that can be coupled to the high-frequency transmitting/receiving coil for transmitting, and 3) an amplifier that can be coupled to the high-frequency transmitting/receiving coil for receiving. A selector switch is provided, which keys a supply voltage to disconnect the amplifier during a transmission operation and the high-frequency current source during a receiving operation from the high-frequency transmitting/receiving coil. An inductor and a capacitor are provided between the high-frequency transmitting/receiving coil and the amplifier and form a series resonating circuit at the magnetic resonance frequency.
    Type: Grant
    Filed: May 15, 2008
    Date of Patent: March 29, 2011
    Assignees: Bundesrepublik Deustschland, vertreten durch das Bundesministerium für Wirtschaft und Technologie, dieses vertreten durch den Präsidenten der Physikalisch-Technischen Bundesanstalt, Universität Leipzig
    Inventors: Frank Seifert, Evgenia Kirilina, Thomas Riemer
  • Patent number: 7722711
    Abstract: An image-forming recording liquid according to the invention contains magnetic polymer particles and a dispersion medium for dispersing the magnetic polymer particles. The magnetic polymer particles contain a magnetic powder and a polymeric compound. The polymeric compound is a polymer prepared by polymerization of at least one monomer selected from the group consisting of a (meth)acrylate monomer and a styrenic monomer. The dispersion medium contains water, polyvinyl alcohol and an acetylene glycol-based surfactant.
    Type: Grant
    Filed: August 1, 2007
    Date of Patent: May 25, 2010
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Takako Kobayashi, Yoshihiro Inaba
  • Publication number: 20080213680
    Abstract: The present invention provides a toner for electrostatic latent image development and a method of magnetic monocomponent development using the toner which can prevent the toner adhesion to a photoconductor for a long time period and can obtain an image having high quality by maintaining functions of the toner for a long time period or by favorably adjusting the conveying property of the toner on a developing sleeve. In a toner for electrostatic latent image development which contains toner particles and inorganic particles and a method of development using the toner, the toner particles exhibit a shape factor SF-1 which satisfies the relationship 115?SF-1?150 and a shape factor SF-2 which satisfies the relationship 115?SF-2?145 and, at the same time, a quantity of inorganic particles which are in a floating state is set to a value which falls within a range from 10 weight % to 25 weight % with respect to the total quantity of the inorganic particles.
    Type: Application
    Filed: February 25, 2005
    Publication date: September 4, 2008
    Inventor: Takashi Nagai
  • Patent number: 7157195
    Abstract: An image forming method is disclosed, comprising (a) exposing a recording material comprising on a support an image forming layer containing colored magnetophoretic particles and a photopolymerizable composition to light to perform photocuring and (b) applying a magnetic field to the recording material to migrate the magnetophoretic particles.
    Type: Grant
    Filed: March 19, 2004
    Date of Patent: January 2, 2007
    Assignee: Konica Minolta Holdings, Inc.
    Inventor: Noriyuki Kokeguchi
  • Patent number: 6979524
    Abstract: A method of forming a magnetic transition pattern in a longitudinal magnetic recording medium, comprising steps of: (a) providing a magnetic recording medium including a layer of a magnetic material having a surface comprised of a plurality of longitudinally extending magnetic domains; (b) contacting the surface of the layer of magnetic material with a topographically patterned imprinting surface of a stamper/imprinter formed of at least one high saturation magnetization, high permeability magnetic material; and (c) applying a unidirectional magnetic field perpendicular to the imprinting surface of the stamper/imprinter, the perpendicular magnetic field creating a longitudinal magnetic field component of sufficient strength to effect selective alignment of the magnetic domains of those portions of the layer of magnetic material which face the depressions of the imprinting surface while retaining the alignment of the magnetic domains of those portions of the layer of magnetic material which face the project
    Type: Grant
    Filed: April 18, 2003
    Date of Patent: December 27, 2005
    Assignee: Seagate Technology LLC
    Inventors: Koichi Wago, Shih-Fu Lee, Li-Ping Wang, Joseph Leigh
  • Publication number: 20040209185
    Abstract: A method of forming a magnetic transition pattern in a longitudinal magnetic recording medium, comprising steps of:
    Type: Application
    Filed: April 18, 2003
    Publication date: October 21, 2004
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Koichi Wago, Shih-Fu Lee, Li-Ping Wang, Joseph Leigh
  • Publication number: 20040191653
    Abstract: An image forming method is disclosed, comprising (a) exposing a recording material comprising on a support an image forming layer containing colored magnetophoretic particles and a photopolymerizable composition to light to perform photocuring and (b) applying a magnetic field to the recording material to migrate the magnetophoretic particles.
    Type: Application
    Filed: March 19, 2004
    Publication date: September 30, 2004
    Applicant: Konica Minolta Holdings, Inc.
    Inventor: Noriyuki Kokeguchi
  • Patent number: 6660440
    Abstract: The present invention relates to a process for generating a printing image carrying printing form on a printing form cylinder in a printing press. The printing image carrying printing form is an erasable printing form on a printing form cylinder of a printing press with low expenditure and high life expectancy. The printing form cylinder has a magnetizeable surface, which can carry a magnetized image and be coated with a toner. The toner adheres to the printing form cylinder. Printing is completed with the printing form created in this manner. After printing, a laser is used to erase the toner from the printing form cylinder.
    Type: Grant
    Filed: September 6, 2001
    Date of Patent: December 9, 2003
    Assignee: Koenig & Bauer AG
    Inventor: Arndt Jentzsch
  • Patent number: 6574034
    Abstract: A method for displaying an image with an electrophoretic display device that includes a multiplicity of individual reservoirs, each containing an electrophoretic display fluid, located between two conductive film substrates, at least one of which is transparent, includes appropriately applying an electric field and a magnetic force to a selected individual reservoir in a manner to cause either a first set of particles or a second set of particles of the display fluid to be displayed. The first set of particles exhibit a color different from and contrasting to a color of the second set of particles, and also preferably a different charging property.
    Type: Grant
    Filed: January 16, 2002
    Date of Patent: June 3, 2003
    Assignee: Xerox Corporation
    Inventors: Pinyen Lin, David H. Pan, Chieh-Min Cheng, Adam Bush
  • Patent number: 6509128
    Abstract: Methods of imagewise printing of adhesives that includes providing a latent adhesive image and then activating the latent adhesive image to form an adhesive image. Methods of preparing latent adhesive toners that involve limited coalescence.
    Type: Grant
    Filed: October 25, 2000
    Date of Patent: January 21, 2003
    Assignee: 3M Innovative Properties Company
    Inventors: Albert I. Everaerts, Lang N. Nguyen
  • Patent number: 6063180
    Abstract: Magnetic iron oxide-containing granules for producing toners or inks, the granules comprising 95.0 to 99.8 wt. % of a magnetic iron oxide-containing compound and 0.2 to 5.0 wt. % of a binder, wherein the magnetic iron oxide-containing compound has an iron content of 50 to 73 wt. %, and wherein the granules have the following properties: a lightness under brightening L* of 40 to 79 CIELAB units, a color cast a* of -1.0 to 4.0 CIELAB units, a color cast b* of 0.0 to -7.0 CIELAB units, an average particle size of 30 to 250 .mu.m, and a residue of less than 2 wt. % in a flow properties test having a 1 mm sieve and 400 strokes.
    Type: Grant
    Filed: June 9, 1998
    Date of Patent: May 16, 2000
    Assignee: Bayer AG
    Inventors: Wolfgang Korschen, Ulrich Meisen
  • Patent number: 5981039
    Abstract: A magnetic recording medium in accordance with the present invention is constituted by a first magnetic film having a magnetic anisotropy in a first direction parallel to the film surface and a second magnetic film that is formed on the first magnetic film and that is made of an amorphous alloy film of a rare-earth metal and a transition metal having a magnetic anisotropy in a second direction that is parallel to the film surface, and different from the first direction. In the above-mentioned magnetic recording medium, the first and second magnetic films have magnetic anisotropies having directions parallel to their surfaces and different from each other. When a magnetic latent image is formed on the magnetic recording medium of this type, it is possible to reduce the height of serration in the serrate magnetization transition structure appearing in the border of magnetization inversion in the magnetic latent image.
    Type: Grant
    Filed: August 27, 1997
    Date of Patent: November 9, 1999
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Hitoshi Isono, Kazuo Van
  • Patent number: 5952138
    Abstract: The invention relates to a magnetic developer comprising a magnetic toner containing at least a binder resin, a magnetic material and a hydrocarbon wax,wherein said magnetic toner has such properties that:a DSC curve of the toner measured by the use of a differential scanning calorimeter is characterized in that with an endothermic peak in raising temperature, its onset temperature is 105.degree. C. or below and its peak temperature is in the range of from 100.degree. C. to 120.degree. C., and that with an exothermic peak in dropping temperature its peak temperature is in the range of from 62.degree. C. to 75.degree. C. and its peak intensity ratio is 5.times.10.sup.-3 or more; andsaid magnetic material has such properties that:a residual magnetization 6r is in the range of from 12 emu/g to 30 emu/g and a coercive force Hc is in the range of from 130 oersteds to 300 oersteds in a magnetic field of 10,000 oersteds.
    Type: Grant
    Filed: March 30, 1995
    Date of Patent: September 14, 1999
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tetsuhito Kuwashima, Satoshi Matsunaga, Yukari Ishibashi
  • Patent number: 5780190
    Abstract: An ionographic process which comprises the generation of a latent image comprised of characters; developing the image with an encapsulated magnetic toner comprised of a core comprised of a polymer and magnetite and wherein the core is encapsulated within a polymeric shell; and subsequently providing the developed image with magnetic ink characters thereon to a reader/sorter device.
    Type: Grant
    Filed: December 4, 1989
    Date of Patent: July 14, 1998
    Assignee: Xerox Corporation
    Inventors: Nancy A. Listigovers, Richard P. N. Veregin, Fernando P. Yulo, Kayong Koch
  • Patent number: 5718995
    Abstract: A composite support for an imaging element is described, which composite support comprises a polymeric film and an electrically conductive layer, wherein the polymeric film comprises a surface which has been activated by energetic treatment, the electrically conductive layer comprises an electrically conductive agent dispersed in an aqueous dispersible polymeric binder comprising an aliphatic, anionic polyurethane having an ultimate elongation to break of at least 350 percent, and the electrically conductive layer is in contiguous contact with the activated surface of the polymeric film. Imaging elements for use in an image-forming process are also described, which element comprise such composite supports and at least one image-forming layer. The invention provides composite supports and imaging elements containing an electrically conductive antistatic layer having excellent adhesion to energetic surface-treated polymer film supports, and of auxiliary layers to the electrically conductive antistatic layer.
    Type: Grant
    Filed: June 12, 1996
    Date of Patent: February 17, 1998
    Assignee: Eastman Kodak Company
    Inventors: Dennis John Eichorst, Cathy Ann Fleischer, Jeremy Grace, Paul Daniel Yocobucci
  • Patent number: 5667924
    Abstract: An image character recognition process comprising: forming an image in a predetermined size and predetermined shape on a receiver member with a marking composition containing a superparamagnetic component; detecting the predetermined size and predetermined shape of the formed image by placing the resulting image bearing receiver member in a magnetic sensing field comprising at least one magnetic sensor and forming a magnetic size and magnetic shape profile map of the detected image; and recognizing the detected image by comparing the magnetic size and magnetic shape profile map of the formed image with reference magnetic profile image maps.
    Type: Grant
    Filed: February 14, 1996
    Date of Patent: September 16, 1997
    Assignee: Xerox Corporation
    Inventor: Ronald F. Ziolo
  • Patent number: 5644987
    Abstract: A process and apparatus for printing with a press at least one image by transfer of an electrostatic colorant vehicle between an intermediate transfer element and a printing carrier, including the steps of making the intermediate transfer element in the press by magnetically developing zones on a substrate, depositing a magnetic, insulating, and hardenable material on the substrate to constitute the zones, hardening the hardenable material, subjecting the hardenable material to an electrostatic charge in order to lend the zones an affinity for the colorant vehicle, and transferring the colorant vehicle to the printing carrier by directly contacting the intermediate transfer element to the printing carrier.
    Type: Grant
    Filed: June 20, 1994
    Date of Patent: July 8, 1997
    Assignee: Nipson
    Inventor: Jean-Jacques Eltgen
  • Patent number: 5614340
    Abstract: A bleachable composition, including an acid photogenerator and a near-infrared radiation-absorbing dye or pigment, is utilized in a method of migration imaging to prevent unwanted absorptions. This composition can be incorporated either in the thermoplastic imaging surface layer of the imaging element, in the marking particles applied to the element, or both. Alternatively, the components of the bleachable composition can be separated with one in the thermoplastic imaging surface layer and the other in the marking particles. After the imaging element is marked and exposed with near-infrared radiation, the bleachable composition caused exposed portions of the imaging element to be bleached. If further bleaching is needed, the element can subsequently be exposed with near-ultraviolet radiation. A migration imaging method, which does not employ the bleachable composition of the present invention, wherein marking particles are magnetically attracted to the imaging element, is also provided.
    Type: Grant
    Filed: September 27, 1993
    Date of Patent: March 25, 1997
    Assignee: Eastman Kodak Company
    Inventors: Douglas E. Bugner, William Mey, Dennis R. Kamp
  • Patent number: 5552252
    Abstract: A process for avoiding or minimizing comet formation which comprises dispersing in a magnetic toner comprised of resin particles, a first magnetite, carbon black, charge additive, and wax, a second soft magnetite; and wherein the toner contains a silica surface additive.
    Type: Grant
    Filed: March 30, 1995
    Date of Patent: September 3, 1996
    Assignee: Xerox Corporation
    Inventors: Douglas A. Lundy, Joseph R. Matalevich, Michael J. Cortash, Michael L. Grande
  • Patent number: 5514467
    Abstract: A MICR tape allows for the complete release of magnetic material from the tape substrate. This is accomplished by creating a tape with a layered structure including a magnetic layer coated on a polymer layer with a release layer therebetween.
    Type: Grant
    Filed: March 4, 1992
    Date of Patent: May 7, 1996
    Assignee: Xerox Corporation
    Inventors: John S. Berkes, Robert J. Gruber
  • Patent number: 5472831
    Abstract: A silver halide light-sensitive material is described, including an embodiment containing a polyester film support having thereon at least one light-sensitive layer, wherein the polyester film support satisfies the following relationships:Tg.ltoreq.32.1A.sup.2 +55X.gtoreq.-0.74Tg+71.7wherein Tg is a glass transition temperature (.degree.C.); A is an equivalent water content (%) after moisture conditioning at 25.degree. C. and 50% RH for 10 days; and X is a degree of crystallinity.
    Type: Grant
    Filed: October 3, 1994
    Date of Patent: December 5, 1995
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yosuke Nishiura, Yukio Shinagawa, Kiyokazu Hashimoto, Junichi Yamanouchi, Yasuo Mukunoki
  • Patent number: 5324603
    Abstract: In accordance with the invention, an image is formed by applying a local magnetic field to selected regions of a magnetic composite medium comprising columns of magnetic particles distributed in a matrix medium. The particles are "hard" or "semi-hard" magnetic materials in order to retain the latent image as residual magnetism, and the image is developed by exposure to magnetic fluid or powders. The image can be erased by exposure to an AC demagnetizing field or a DC sweep magnet. Preferred apparatus for making such images comprises a sheet of such composite material having a pair of major surfaces with columns of magnetic particles oriented between the surfaces. A local magnetic field, such as a magnetic pen, can be used to write a latent magnetic image on one of the major surfaces. The magnetic columns present the latent image for development at either major surface.
    Type: Grant
    Filed: April 17, 1992
    Date of Patent: June 28, 1994
    Assignee: AT&T Bell Laboratories
    Inventors: Sungho Jin, Thomas H. Tiefel
  • Patent number: 5256479
    Abstract: Ultrafine particles of Fe--Co--P material with a Fe/Co atomic ratio of from 95/5 to 70/30 and a (Fe+Co)/P atomic ratio of from 85/15 to 60/40 show improved ferromagnetic properties. The average particle size is from 0.005 to 0.1 .mu.m. Such ultrafine particles are prepared through gas phase reaction by evaporating a source material. They are useful in both magnetic and thermomagnetic recording media ensuring high density recording.
    Type: Grant
    Filed: March 23, 1992
    Date of Patent: October 26, 1993
    Assignee: TDK Corporation
    Inventors: Yasumichi Tokuoka, Jiro Yoshinari
  • Patent number: 5229259
    Abstract: Disclosed is a silver halide photographic material comprising a silver halide emulsion layer on at least one side of a support and at least one magnetic recording layer on at least one side of the support, and the magnetic recording layer is transparent and comprises a ferromagnetic powder, a silica and alumina co-precipitate on the surface of the ferromagnetic powder, and a binder.
    Type: Grant
    Filed: August 12, 1991
    Date of Patent: July 20, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Minoru Yokota
  • Patent number: 5223360
    Abstract: Materials coated with plate-like pigments and characterized in that the coating shows structuring in defined areas due to a difference in the orientation of the pigment particles are highly suitable in the area of general security printing.
    Type: Grant
    Filed: November 15, 1990
    Date of Patent: June 29, 1993
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Constanze Prengel, Klaus-Dieter Franz, Hartmut Hartner, Manfred Kieser, Axel von Daacke, Klaus Bernhardt
  • Patent number: 5154944
    Abstract: A method and apparatus for developing a latent magnetic image in which a layer of magnetically attractable toner powder having a specific resistance less than 10.sup.9 ohms.meter is conveyed by a toner conveyor to a developing zone past a medium carrying the latent image and an AC voltage is applied between the toner conveyor and the medium carrying the latent image.
    Type: Grant
    Filed: November 8, 1991
    Date of Patent: October 13, 1992
    Assignee: Oce-Nederland B.V.
    Inventor: Pierre A. M. Klerken
  • Patent number: 5147744
    Abstract: A colored magnetic encapsulated toner composition comprised of a core comprised of a polymer binder, magnetic metal particles, whitener, color pigment, dye or mixtures thereof, and which core is encapsulated in a polymeric shell, and wherein the toner surface comprises an optional conductive metal oxide, or metal oxides and an optional release additive, or additives.
    Type: Grant
    Filed: February 28, 1991
    Date of Patent: September 15, 1992
    Assignee: Xerox Corporation
    Inventors: Guerino G. Sacripante, Richard P. N. Veregin, Beng S. Ong, Padam K. Angra
  • Patent number: 5147768
    Abstract: A silver halide color photographic material comprising a transparent support having provided on the frontside thereof at least one hydrophilic colloid layer at least one layer of which is a photosensitive silver halide emulsion layer, said photographic material further comprising a transparent magnetic recording layer provided on the backside of the transparent support containing a ferromagnetic fine powder dispersed in a binder at a coverage of 4.times.10.sup.-3 g/m.sup.2 or more and having a gray degree of transmission density of 70% or more and an average transmission density of 0.5 or less in the visible region. The present invention provides a recording material for recording information both optically and magnetically without adversely affecting the color balance.
    Type: Grant
    Filed: July 9, 1991
    Date of Patent: September 15, 1992
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Yoshio Sakakibara
  • Patent number: 5124217
    Abstract: An electrophotographic process for enabling substantially tamperproof images, including the generation of a latent image; developing the image with a toner composition comprised of resin particles, magnetite particles, and a colored organic soluble dye, a colored organic insoluble dye, or the salts thereof; and an optional additive component comprised of an aliphatic hydrocarbon or a polymeric alcohol of the formulaCH.sub.3 (CH.sub.2).sub.n CH.sub.2 OHwherein n is a number of from about 30 to about 500.
    Type: Grant
    Filed: June 27, 1990
    Date of Patent: June 23, 1992
    Assignee: Xerox Corporation
    Inventors: Robert J. Gruber, Ronald J. Koch, Timothy J. Fuller
  • Patent number: 5102755
    Abstract: An ionographic process which comprises the generation of a latent image comprised of characters; developing the image with a toner comprised of resin particles, magnetite particles, and a crystalline high density wax with a weight average molecular weight of from about 1,000 to about 10,000; and subsequently providing the developed image with magnetic ink characters thereon to a reader/sorter device.
    Type: Grant
    Filed: February 1, 1991
    Date of Patent: April 7, 1992
    Assignee: Xerox Corporation
    Inventors: John G. Ruhland, Bernard Grushkin
  • Patent number: 5080986
    Abstract: An imaging process which comprises the genertion of an image in an electronic printing magnetic image character recognition apparatus; thereafter developing the image with an encapsulated toner composition comprised of a core with a fluorocarbon-incorporated polymer binder, magnetite, and optional color pigments and a polymeric shell.
    Type: Grant
    Filed: November 6, 1990
    Date of Patent: January 14, 1992
    Assignee: Xerox Corporation
    Inventors: Grazyna Kmiecik-Lawrynowicz, Beng S. Ong
  • Patent number: 4987044
    Abstract: A radiation beam used for selectively exposing a surface is moved in a helical path by means of two oscillating mirrors vibrating about axes that are mutually perpendicular. By maintaining a constant product for oscillating frequency and rotational oscillatory mirror deflection, the level of exposure can be made substantially constant.
    Type: Grant
    Filed: May 31, 1989
    Date of Patent: January 22, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Eustathios Vassiliou
  • Patent number: 4971844
    Abstract: A device for fixing or transferring and fixing a powder containing thermoplastic resin on to a receiving material under the influence of pressure and heat, in which device the fixing member in pressure contact with the powder during the fixing of the powder image is provided with an outer covering consisting mainly of silicone rubber. The silicone rubber is the reaction product of polyorganosiloxane bearing Si--H groups and polyorganosiloxane which bears Si--(CH.dbd.CH.sub.2) groups and which on average contains between 40 and 1000 monomeric units per polymer chain, bears 1.5-4 terminal vinyl groups, bears at most one non-terminal vinyl group per 80 monomeric units and contains at most 2% Si atoms in the form of SiO3/2 or SiO4/2 units. The thickness of the silicone rubber covering is preferably less than 500 micrometers.
    Type: Grant
    Filed: June 27, 1989
    Date of Patent: November 20, 1990
    Assignee: Oce-Nederland B.V.
    Inventors: Bauke Schoustra, Johannes H. A. Kuiper
  • Patent number: 4958173
    Abstract: The invention comprises a toner receptive coating for substrates, typically paper, label or tag stock, for use in conventional printers such as ion deposition printers and photostatic copiers. The coating on paper or polymeric film improves the print density and durability of text or images transferred thereto from printers or copiers, particularly those which employ dry magnetic toner. The coating eliminates the need to use heat fusing to fix the transferred toned image to the substrate. The coating is composed of pressure sensitive polymeric binder material and particulate fillers. The polymeric binder has a glass transition temperature less than 20.degree. C. preferably a glass transition temperature between -10.degree. C. and +10.degree. C. The fillers include a polymeric filler, typically a polyethylene wax or a polyethylene/polytetrafluoroethylene wax mixture and a mineral filler, typically particulate silicon dioxide.
    Type: Grant
    Filed: November 30, 1989
    Date of Patent: September 18, 1990
    Assignee: Dennison Manufacturing Company
    Inventors: John J. Fitch, Tim Parker, Alfred T. Bouchard, Jr., Mary Sullivan
  • Patent number: 4877341
    Abstract: The invention relates to a device for intermittently applying particles of a powdered developer to the recording surface of a magnetographic printer. This device includes a reservoir (17) containing developer particles, a transport element (23) for placing these particles in the vicinity of the surface of a magnetic drum (11), a deflector (24) disposed between this transport element and the drum to apply the particles to the drum surface, and a squeegee (45) disposed between the deflector and the transfer station (H), and actuated by an electromagnet (EA) for selectively pulling away the particles that have been deposited on the drum surface. The invention is applicable to magnetographic printers.
    Type: Grant
    Filed: January 27, 1989
    Date of Patent: October 31, 1989
    Assignee: Bull S.A.
    Inventors: Bernard Cherbuy, Jacques Estavoyer
  • Patent number: 4859550
    Abstract: An electrophotographic process which comprises the generation of latent image; developing the image with a toner composition comprised of resin particles, magnetite particles, and an additive component comprised of an aliphatic hydrocarbon or a polymeric alcohol of the formulaCH.sub.3 (CH.sub.2).sub.n CH.sub.2 OHwherein n is a number of from about 30 to about 500; and subsequently providing the developed image with magnetic ink characters thereon to a reader/sorter device whereby toner offsetting and image smearing is minimized in said device.
    Type: Grant
    Filed: September 2, 1988
    Date of Patent: August 22, 1989
    Assignee: Xerox Corporation
    Inventors: Robert J. Gruber, Raphael F. Bov, Thomas D. Cometa, Paul W. Eakin, John S. Berkes, Bernard Grushkin
  • Patent number: 4798776
    Abstract: A light receiving member has a support and a light receiving layer. The support has an uneven-shaped surface of a plurality of spherical dimples formed by the impact of a plurality of rigid true spheres on the surface of the support. Each of the dimples has an identical radius of curvature R and an identical width D, wherein the radio D/R of the width D to the radius of curvature R is from 0.03 to 0.07. The light receiving layer is a multi-layered structure having a free surface which formed from an amorphous material containing silicon atoms as the main constituent, at least one of oxygen atoms, carbon atoms and nitrogen atoms, and at least one of hydrogen atoms and halogen atoms. The light receiving layer contains a layer region which functions as a photosensitive layer.The light receiving member, when used with a coherent laser beam as an optical source, acts to prevent the occurrence of an interference fringe pattern during image formation.
    Type: Grant
    Filed: September 19, 1986
    Date of Patent: January 17, 1989
    Assignee: Canon Kabushiki Kaisha
    Inventors: Mitsuru Honda, Atsushi Koike, Kyosuke Ogawa, Keiichi Murai
  • Patent number: 4752807
    Abstract: A development station of electrographic apparatus uses particles of toner to develop latent images on a photoconductor. As the toner particles are depleted a new supply of toner from a container is provided to the development station. Apparatus for adding toner to the development station includes a mounting member having an opening through which toner can pass to the station. A cover hinged to the mounting member moves between closed and open positions, and the cover has an opening that is aligned with the opening in the mounting member when the cover is closed. A shut-off slide in the cover has an opening that can be aligned with the opening in the cover. A container of fresh toner is coupled to the slide and moves with the slide between positions wherein the toner is blocked from flowing through the cover and a position wherein toner from the container can move through the slide, the cover and the mounting member into the development station.
    Type: Grant
    Filed: December 22, 1986
    Date of Patent: June 21, 1988
    Assignee: Eastman Kodak Company
    Inventor: Thomas W. Mort
  • Patent number: 4721661
    Abstract: Improved magnetic toner resolution obtained with vacuum device with terminal lips having squared off edges with lips parallel to rotation axis of printing plate but offset at angle of 5.degree. to 60.degree..
    Type: Grant
    Filed: February 10, 1986
    Date of Patent: January 26, 1988
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Richard A. Olson, Frederick W. Saunders, III
  • Patent number: 4695524
    Abstract: Disclosed is a process for generating consistent high quality images comprised of (1) providing a xerographic imaging or printing apparatus; (2) adding thereto a stable two component developer composition comprised of toner composition with an average particle diameter of from about 6 to about 10 microns with resin particles, first pigment particles, second magnetite pigment particles, which are present in a greater amount than the first pigment particles, and blended flow additive particles; and carrier particles consisting of a ferrite core, or a steel core, and a coating thereover selected from the group consisting of terpolymers of styrene, methacrylate, and triethoxysilane; and polymethacrylate, which coating has incorporated therein conductive particles; (3) forming electrostatic latent images or magnetic images in the apparatus; and (4) developing the images formed.
    Type: Grant
    Filed: May 21, 1986
    Date of Patent: September 22, 1987
    Assignee: Xerox Corporation
    Inventors: John F. Knapp, Robert J. Gruber, Lawrence Floyd, Jr., Steven B. Bolte, Michael G. Swales
  • Patent number: 4689282
    Abstract: A method for printing by magnetography under atmospheric conditions of relative humidity exceeding 65 or even 75% consists in transferring to a sheet of paper a fusible magnetic ink in powdered form which is distributed on a temporary magnetizable support in accordance with the configuration to be produced, whereupon the ink is fixed by fusion on the sheet of paper. The paper has a surface resistivity of at least 10.sup.10 ohms square and a relative smoothness of at least 20 Bekk.
    Type: Grant
    Filed: January 3, 1986
    Date of Patent: August 25, 1987
    Assignee: Aussedat Rey
    Inventors: Georges Gidon, Claude Richard
  • Patent number: 4654289
    Abstract: When latent images in a magnetic printing apparatus are recorded and developed, a magnetic pattern which has one direction and which has at least two magnetic transfer regions is formed at one-dot black picture regions on a recording medium. When the black picture regions have two or more dots, beside the magnetic pattern having one direction, at least one magnetized pattern having the other direction is formed therein. A white picture region is formed by a magnetized pattern which is longer than the magnetized pattern in the black picture region and which has the other direction. The developing magnetic field is formed in the same direction as that of the other direction. A print having high resolution can be obtained by mutual action between the developing field and the magnetic field generated by the magnetized pattern for the recording.
    Type: Grant
    Filed: December 13, 1985
    Date of Patent: March 31, 1987
    Assignee: Iwatsu Electric Co., Ltd.
    Inventor: Norio Kokaji
  • Patent number: 4647521
    Abstract: A photosensitive member, or image-holding member, for electrophotography having a conductive substrate, a top layer for holding electrostatic image and/or toner image wherein the top layer is formed by applying a coating fluid containing hydrophobic silicon and a binder resin, and the display unit used with the photosensitive member.
    Type: Grant
    Filed: September 5, 1984
    Date of Patent: March 3, 1987
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yoshihiro Oguchi, Kazuharu Katagiri
  • Patent number: 4636449
    Abstract: An electrostatic printing process is disclosed wherein a printing roll is formed by forming a latent magnetic image in a magnetic imaging member, decorating the latent magnetic image with a nonconductive magnetic toner to form a toner image, transferring the toner image to a conductive member and temporarily fixing the toner image to the conductive member. The toner image on the conductive member is electrostatically charged, while the charge is dissipated from the remaining area of the conductive member. The charged image of magnetic toner is decorated with an electrostatic toner comprising a colorant and a binder resin to form an electrostatic image which is transferred to a substrate. Pattern change is accomplished by washing off the fused toner from the conductive print roll and forming a new fused toner image on it.
    Type: Grant
    Filed: December 2, 1983
    Date of Patent: January 13, 1987
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Emery J. Gorondy
  • Patent number: 4613554
    Abstract: The invention relates to a process and a device for developing a latent image formed on a magnetic surface, by means of a magnetic developing powder, in order to form a powder image.The device contains means (2) for causing the powder (4) to flow onto the magnetic surface (1) uninfluenced by a magnetic field other than that of the magnetic surface (1). These means can consist of magnetic means (3) for taking the powder (4) from a trough (5), means (6) for detaching the powder (4) from the magnetic means (3), and means (7) for bringing the powder (4) into the vicinity of the magnetic surface (1).This developing device can be used in a printing apparatus containing means for transferring a powder image onto a substrate.
    Type: Grant
    Filed: May 10, 1984
    Date of Patent: September 23, 1986
    Assignee: Rhone-Poulenc Systemes
    Inventors: Pham K. Quang, Donald H. M. Kings
  • Patent number: 4609603
    Abstract: A process for generating consistent high quality images for extended periods, consisting essentially of (1) providing a xerographic imaging, or printing apparatus; (2) adding thereto a stable two component developer composition comprised of resin particles, first pigment particles, second magnetite pigment particles, which are present in a greater amount than the first pigment particles, and blended flow additive particles; and carrier particles consisting of a ferrite core, or a steel core and a coating thereover selected from the group consisting of terpolymers of styrene, methacrylate, and triethoxysilane; and polymethacrylate, which coating has incorporated therein conductive particles; (3) forming electrostatic latent images, or magnetic images in the apparatus; and (4) developing the images formed, wherein the developer composition retains its electrical properties for over 2.5 million imaging cycles.
    Type: Grant
    Filed: December 14, 1984
    Date of Patent: September 2, 1986
    Assignee: Xerox Corporation
    Inventors: John F. Knapp, Robert J. Gruber, Lawrence Floyd, Jr., Steven B. Bolte
  • Patent number: RE33172
    Abstract: Disclosed is an improved, simple, economical process for generating documents, such as personal checks, suitable for magnetic image character recognition, which process comprises generating such documents with conventional xerographic methods in a high speed electronic laser printing device, and wherein there is selected as the developer composition a magnetic toner containing from about 20 percent by weight to about 70 percent by weight of magnetite particles, and from about 30 percent by weight to about 80 percent by weight of toner resin particles of styrene copolymers, such as a styrene butadiene copolymer, a styrene n-butylmethacrylate copolymer, or polyesters, and wherein the carrier particles are comprised of ferrite cores, coated with various polymeric resinous compositions.
    Type: Grant
    Filed: May 4, 1987
    Date of Patent: February 27, 1990
    Assignee: Xerox Corporation
    Inventors: Robert J. Gruber, John F. Knapp, Steven B. Bolte