Corona Discharge Process Patents (Class 430/937)
  • Patent number: 7342227
    Abstract: A plasma sprayed TiO2 coating is used to remove effluents produced during an electrical charging step using a corona charging device. The plasma spray allows for the application of TiO2 ceramic to an aluminum dicorotron housing. Plasma spray also increases the electrical conductivity of the TiO2 (which is necessary for the dicorotron operation). Plasma sprayed coatings are also porous which aids in the capture and reduction of effluents.
    Type: Grant
    Filed: April 24, 2006
    Date of Patent: March 11, 2008
    Assignee: Xerox Corporation
    Inventors: Christopher D. Blair, Joy L. Longhenry, Jeffry Welch, Thomas Debies, Bruce J. Parks, Eliud Robles-Flores, Evan Kastner, Jamie S. Clayfield
  • Patent number: 7264752
    Abstract: Conductive coatings usable for coating various elements of corona generating devices and method of forming such coatings are provided. The coatings include graphite and at least one transition metal oxide catalyst. When the conductive coatings are employed in elements of corona generating devices and the devices are activated, the conductivity of the elements is maintained in a manner that preserves the ability of a photoreceptor in an image forming device to retain an image charge in a fashion sufficient to allow subsequent development with toner. The coatings also function to scavenge ozone and neutralize nitrogen oxides formed during operation of corona generating devices. Corona generating devices including elements having such coatings are also provided.
    Type: Grant
    Filed: August 29, 2003
    Date of Patent: September 4, 2007
    Assignee: Xerox Corporation
    Inventor: Stephan V. Drappel
  • Patent number: 6344303
    Abstract: A preparation method of an image forming material comprising a support having thereon at least an image forming layer is desclosed, comprising subjecting one side of the support to a treatment to modify the surface of the support and coating an image forming layer on the surface-modified support, wherein the image forming layer contains a resin containing a polar group and an compound containing an isocyanate group and the modified surface of the support exhibiting a surface energy of 45 to 60 dyne/cm, and wherein the image forming material is imagewise exposed to a high density energy light, thereby making an exposed area of the image forming layer removable and removing the removable image forming layer to form an image.
    Type: Grant
    Filed: December 10, 1999
    Date of Patent: February 5, 2002
    Assignee: Konica Corporation
    Inventor: Hideki Takahashi
  • Patent number: 6326128
    Abstract: A process for the production of a photosensitive recording material for producing relief printing plates is described, in which a photosensitive layer is laminated with a composite element comprising a protective cover sheet, a release layer and, if required, a further layer, wherein the surface of the uppermost layer of the composite element or the surface of the photosensitive layer is subjected to a corona treatment immediately before contact. As a result of the corona treatment, the adhesion of the applied layer is substantially increased.
    Type: Grant
    Filed: March 17, 1998
    Date of Patent: December 4, 2001
    Assignee: BASF Drucksysteme GmbH
    Inventors: Thomas Telser, Stefan Wegener, Sabine Philipp, Manfred Z├╝rger
  • Patent number: 5888713
    Abstract: The present invention is a method of producing a photographic support. The method includes providing a photographic paper and transporting the photographic paper through an atmospheric glow discharge zone, wherein the atmospheric glow discharge zone contains a gas with a dielectric strength which is less than air. The atmospheric glow discharge zone is subjected to an electric frequency between 40 kHz and 13.56 Mhz and an electric field such that an atmospheric glow discharge is formed; and the photographic paper is coated with a polymeric coating.
    Type: Grant
    Filed: May 19, 1997
    Date of Patent: March 30, 1999
    Assignee: Eastman Kodak Company
    Inventors: Eric E. Arrington, David A. Glocker, Theodore J. Tatarzyn
  • Patent number: 5691123
    Abstract: Elements having a support with lubricant on both sides can be treated to remove substantially all of the lubricant from one side only. Various chemical, mechanical and electrical treatments are contemplated, but glow discharge treatment is particularly useful. Photographic film supports having one or more layers applied thereto can be treated in this manner before or after annealing so that lubricant present on the treated side does not reduce adhesion of later applied silver halide emulsion layers.
    Type: Grant
    Filed: January 11, 1996
    Date of Patent: November 25, 1997
    Assignee: Eastman Kodak Company
    Inventors: Bradley Keith Coltrain, Dennis Ray Freeman, David Appler Glocker
  • Patent number: 5563029
    Abstract: The present invention is a biaxially oriented polyester film support in which the surface has been subjected to an energetic treatment to produce amine groups on the polyester surface. The treated surface is then coated with a dilute amine reactive hardener solution. After drying the hardener solution a photographic emulsion is coated to the surface. The resulting film element has better adhesion of the photographic emulsion after photoprocessing than previous known methods.
    Type: Grant
    Filed: April 3, 1995
    Date of Patent: October 8, 1996
    Assignee: Eastman Kodak Company
    Inventors: Jeremy Grace, Louis J. Gerenser, Janglin Chen, Edgar E. Riecke
  • Patent number: 5539205
    Abstract: An element in a corona generating device having at least one conductive corona discharge electrode for depositing negative charge on an imaging surface in an electrostatographic imaging apparatus, the element being capable of adsorbing nitrogen oxide species generated when said corona generating device is energized and capable of desorbing nitrogen oxide species when the corona generating device is not energized, the element having an adhesion, promoting surface reclaimed from prior use in a similar capacity by immersion in an alkaline ultrasonic bath where the cavitation action of the bath is sufficient to remove any binder thereon and any metal, metallic compound and other solid particles as solid particles without metallic dissolution in the alkaline bath while at the same time providing a random microetched surface roughness to promote the subsequent coating and adherence of a substantially continuous thin conductive dry film of aluminum hydroxide containing graphite and powdered nickel, the reclaimed ele
    Type: Grant
    Filed: January 30, 1995
    Date of Patent: July 23, 1996
    Assignee: Xerox Corporation
    Inventor: Louis Reale
  • Patent number: 5532118
    Abstract: An imaging element comprising a light-sensitive imaging layer and a polyester film support having coated thereon greater than 0.17 gm/m.sup.2 of a layer of a self-crosslinking polyurethane derived from an isocyanate terminated prepolymer extended with an aliphatic polyamine and end-capped with N-methylol hydrazide groups, the prepolymer being derived from (a) a diisocyanate, and (b) a polyester polyol and having pendant water dispersing, carboxylic salt groups on the polymer chain.
    Type: Grant
    Filed: June 2, 1995
    Date of Patent: July 2, 1996
    Assignee: Eastman Kodak Company
    Inventors: Charles L. Bauer, Mary A. Krenceski, John J. Fitzgerald
  • Patent number: 5342717
    Abstract: A direct contact type charging component for use in electrophotographic process containing a protective surface layer which comprises a polyether-ester-amide block copolymer. The copolymer is environmentally stably having a volume resistivity between 10.sup.6 Ohm-cm and 10.sup.12 Ohm-cm and a Shore hardness between Shore D 5 and Shore D 90. During the electrophotographic process, a voltage is applied externally to the charging component to cause a charged component, which typically comprises a photo-conductive drum, to become electrostatically charged. In the preferred embodiment, the voltage consists of a direct voltage of .+-.200 to .+-.2,000 V overlapped with an alternating voltage having a peak-to-peak voltage of 4,000 V.
    Type: Grant
    Filed: February 3, 1993
    Date of Patent: August 30, 1994
    Assignee: Industrial Technology Research Institute
    Inventors: Der-Tarng Su, Wen-Jer Chen, Jeng-Yue Wu, Ming-Chu Wu
  • Patent number: 5171659
    Abstract: A process is disclosed of preparing a photographic emulsion containing tabular silver halide grains exhibiting a reduced degree of total grain dispersity. After forming a population of silver halide grain nuclei containing parallel twin planes, ripening out a portion of the silver halide grain nuclei. The silver halide grain nuclei containing parallel twin planes remaining are then grown to form tabular silver halide grains. The total grain dispersity of the emulsion is reduced by incorporating bromide ion in the dispersing medium prior to forming the silver halide grain nuclei and, at the time parallel twin planes are formed in the silver halide grain nuclei, a polyalkylene oxide block copolymer surfactant containing terminal hydrophilic alkylene oxide block units linked by a lipophilic alkylene oxide block unit accounting for at least 4 percent of the molecular weight of the copolymer.
    Type: Grant
    Filed: May 14, 1991
    Date of Patent: December 15, 1992
    Assignee: Eastman Kodak Company
    Inventors: Allen K. Tsaur, Mamie Kam-Ng
  • Patent number: 5147771
    Abstract: A process is disclosed of preparing a photographic emulsion containing tabular silver halide grains exhibiting a reduced degree of total grain dispersity. After forming a population of silver halide grain nuclei containing parallel twin planes, a portion of the silver halide grain nuclei are ripened out. The silver halide grain nuclei containing parallel twin planes remaining are then grown to form tabular silver halide grains. The total grain dispersity of the emulsion is reduced by incorporating bromide ion in the dispersing medium prior to forming the silver halide grain nuclei and, at the time parallel twin planes are formed in the silver halide grain nuclei, a grain dispersity reducing concentration of a polyalkylene oxide block copolymer surfactant is present comprised of two terminal lipophilic alkylene oxide block units linked by a hydrophilic alkylene oxide block unit accounting for at least 4 percent of the molecular weight of the copolymer.
    Type: Grant
    Filed: May 14, 1991
    Date of Patent: September 15, 1992
    Assignee: Eastman Kodak Company
    Inventors: Allen K. Tsaur, Mamie Kam-Ng
  • Patent number: 5055320
    Abstract: A support sheet for photographic printing paper having an undercoat layer on which a photographic emulsion layer is to be formed, and which is free from foaming, contamination by foreign substances, and putrefaction and does not effect the photographic emulsion, by the steps of coating front and back surfaces of a substrate sheet with polyolefin resins; surface-activating the front coating layer; and extrusion coating the activated surface of the front coating layer with a coating liquid comprising gelatin, through a slit-shaped orifice, to form the undercoat layer.
    Type: Grant
    Filed: December 14, 1989
    Date of Patent: October 8, 1991
    Assignee: Oji Paper Co., Ltd.
    Inventors: Takaharu Miura, Tsunehisa Shigetani, Minoru Moriki
  • Patent number: 5006761
    Abstract: An arrangement for transporting air with the aid of an electric ion wind comprises a corona electrode (K) and a target electrode (M) located downstream of the corona electrode. A d.c. voltage source (3) has its terminals connected to the corona electrode and the target electrode, respectively, so that a corona discharge is generated at the corona electrode. The corona electrode (K) includes one or more wirelike electrode elements (4) located adjacent the symmetry axis of the air-flow path (1) and having, as seen in a direction perpendicular to the symmetry axis, an extension which is substantially much smaller than the cross dimension of the airflow path. The wirelike electrode elements (4) lack free, unattached ends at which the field strength exceeds the field strength at the peripheral surface of the electrode elements, thereby avoiding punctiform corona-discharge concentrations and confining the corona discharge to the peripheral surface of the electrode elements.
    Type: Grant
    Filed: May 27, 1988
    Date of Patent: April 9, 1991
    Assignee: Astra-Vent AB
    Inventors: Vilmos Torok, Andrzej Loreth
  • Patent number: 5004669
    Abstract: Disclosed is a light-sensitive silver halide photographic material comprising a transparent support and provided thereon a silver halide emulsion layer, wherein the support is subjected to corona discharge treatment on its surface opposite to the side on which the emulsion layer is provided, and is provided thereon with a subbing layer containing a latex polymer, a non-gelatin layer containing a conductive polymer, and a gelatin layer containing a conductive polymer and a backing dye, in this order. The light-sensitive silver halide photographic material obtained by this invention can be handled in a roomlight environment when used as a light-sensitive material particularly in the field of printing plate making or the like, has a superior antistatic ability and a high sensitivity, and yet can obtain a photographic image with a high contrast, and also can stably obtain a halftone with a high quality and less fog.
    Type: Grant
    Filed: October 27, 1989
    Date of Patent: April 2, 1991
    Assignee: Konica Corporation
    Inventors: Taketoshi Yamada, Takeshi Habu, Yasuhiko Takamuki
  • Patent number: 4990416
    Abstract: A method for the deposition of phosphor containing materials to CRT or VFD faceplates using reversal toning is dislosed. The method incudes the steps of charging the phosphor containing particles and the surface of a patterned photoresist with a charge of the same sign so that the particles are accurately deposited directly to an uncharged transparent surface electrode on the substrate.In a preferred embodiment, glass and/or polymeric binders may be included with the phosphor containing materials to enhance adherence to the substrate.
    Type: Grant
    Filed: June 19, 1989
    Date of Patent: February 5, 1991
    Assignee: Coloray Display Corporation
    Inventor: John B. Mooney
  • Patent number: 4967119
    Abstract: An arrangement for transporting air with the aid of so-called ion-wind which includes at least one corona electrode and at least one target electrode is shown and described. The corona electrode is a thin wire electrode passing from one side of a duct to another, and the target electrode has a shape such that the distance between the corona electrode and the target electrode is less in the region of the corona electrode ends than in the corona electrode middle. This placement of the electrodes closer together at the ends of the wire electrode provides a uniform corona current over the whole length of the elongated corona electrode which provides the most uniform air flow over the entire cross-sectional area of the duct in which the electrodes are mounted.
    Type: Grant
    Filed: May 27, 1988
    Date of Patent: October 30, 1990
    Assignee: Astra-Vent AB
    Inventors: Vilmos Torok, Andrzej Loreth
  • Patent number: 4837136
    Abstract: A silver halide photographic material is described comprising a support having coated thereon at least one silver halide emulsion layer, wherein at least one of the silver halide emulsion layer and other hydrophilic colloid layer contains a nondiffusible photographically useful compound having a sulfo group and a group represented by the following general formula (I): ##STR1## wherein R.sub.1 and R.sub.2 each represents an aliphatic group having at least 2 carbon atoms and r represents 0 or 1.The compounds represented by the general formula (I) are photographically useful compounds which impart excellent photographic properties to silver halide photographic materials, including improved dispersibility.
    Type: Grant
    Filed: October 9, 1986
    Date of Patent: June 6, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Seiji Ichijima, Yasuhiro Shimada, Jun Arakawa
  • Patent number: 4812711
    Abstract: An arrangement for transporting air with the aid of so-called ion-wind includes at least one corona electrode (K) and at least one target electrode (M) located downstream of the corona electrode at a distance therefrom. The arrangement also includes a direct-current voltage source, the two terminals of which are connected to the corona electrode and the target electrode respectively. The construction of the corona electrode and the voltage of the voltage source are such that a corona discharge generating air ions occurs at the corona electrode.
    Type: Grant
    Filed: January 13, 1987
    Date of Patent: March 14, 1989
    Assignee: Astra-Vent AB
    Inventors: Vilmos Torok, Andrzej Loreth
  • Patent number: 4711808
    Abstract: There are disclosed a novel PVF.sub.2 film of beta phase crystalline structure, predominantly, and a method for making it. The beta phase is achieved by first exposing a surface of an insulating polymeric support to an A.C. corona discharge treatment, and then casting molten PVF.sub.2 onto that exposed surface while chilling the cast PVF.sub.2.
    Type: Grant
    Filed: February 19, 1986
    Date of Patent: December 8, 1987
    Assignee: Eastman Kodak Company
    Inventors: Michael A. Marcus, John E. Benson
  • Patent number: 4649097
    Abstract: Disclosed is a corona discharge apparatus capable of producing a uniform corona electrical charging which has a discharge electrode and a grounded roller wherein a metal roller clad with an insulating layer of or containing a high-permittivity substance is used as the grounded roller or the discharge electrode in roller form. Excellent durability and physical strength of the roller keeping the advantage of producing uniformly distributed corona charge can be obtained by overlaying said insulating layer with a layer of insulators other than the high-permittivity substance used in the former layer. Further disclosed is a method for corona treatment using said apparatus.
    Type: Grant
    Filed: June 12, 1985
    Date of Patent: March 10, 1987
    Assignee: Mitsubishi Paper Mills Ltd.
    Inventors: Satoshi Tsukada, Kazuhisa Taguchi
  • Patent number: 4590148
    Abstract: A process for producing a light-sensitive lithographic plate requiring no dampening solution comprising (1) carrying out corona discharge treatment on the surface of a silicone rubber layer of a light-sensitive lithographic plate requiring no dampening solution wherein the silicone rubber layer is the top layer, (2) spraying a solution or dispersion containing a non-volatile solid component on said silicone rubber layer, and (3) drying to provide fine projection patterns on said silicone rubber layer.
    Type: Grant
    Filed: March 12, 1985
    Date of Patent: May 20, 1986
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hiroshi Takahashi, Hiroyuki Tamaki, Chikashi Ohishi, Keisuke Shiba
  • Patent number: 4549659
    Abstract: Selection means is provided for particles following a free flight trajectory path, those particles having a preselected characteristic, such as fluorescence under x-ray bombardment, being detected and a signal being transmitted on such detection to electrostatic charging means to locally ionize the atmosphere and thereby charge the detected particle as it passes through the locally ionized atmosphere, the charged particle being deflected from its free flight trajectory path by an electric field. Non-detected and uncharged particles continue in the free flight trajectory path. Particles may be detected in a path having lateral spread by providing detecting means and electrostatic charging means which are together responsive to particles in respective portions of the path.
    Type: Grant
    Filed: August 3, 1983
    Date of Patent: October 29, 1985
    Assignee: CRA Exploration Pty. Ltd.
    Inventors: Albert P. Hawkins, Alan Boyle, Alan M. Stone
  • Patent number: 4220471
    Abstract: A photographic material comprising a support having on the surface a polypropylene resin component and a hydrophilic colloidal layer on the top surface which are firmly adhered together, is produced by subjecting the support having on the surface a polypropylene resin component to corona discharge, applying thereto a subbing layer comprising (a) at least one water-dispersed polymer latex selected from butadiene-acrylic ester copolymers, polyvinyl chloride and polystyrene, (b) a compound having an ethyleneimino group such as that capable of hardening a colloidal gelatin or casein, and (c) a water-soluble polymer, and providing a hydrophilic protective colloidal layer on said subbing layer.
    Type: Grant
    Filed: October 4, 1978
    Date of Patent: September 2, 1980
    Assignee: Mitsubishi Paper Mills, Ltd.
    Inventors: Sukeaki Date, Seigo Ebato
  • Patent number: 4218246
    Abstract: A method of transferring images produced by liquid developer in a photographic process which comprises applying a corona charging to a photosensitive member after the development of latent images to increase the attaching force of a toner of the developed image to the photosensitive member and remove the liquid developer and transferring the developed image to a copying web. The corona charging may be applied to the photosensitive member at a point, after development, wherein the angle subtended by a vertical line passing through the center of a drum photosensitive member and a line connecting the center of the drum photosensitive member with the point on the surface of the drum photosensitive member to which the corona charging is applied is not larger than 60.degree..
    Type: Grant
    Filed: January 19, 1978
    Date of Patent: August 19, 1980
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hiroshi Tanaka, Takashi Saito
  • Patent number: 4210448
    Abstract: Sharp, high-resolution copies of electrostatc images developed with a one-component magnetic toner can be obtained by corona transfer to a copy sheet if toner resistivity is at least 10.sup.13 ohm-cms. Such resistivity is attainable by incorporating carbon within the toner particles in an amount preferably about 1 to 1.3 per cent by weight, the surface of the toner particles either not having any carbon thereon or it being present in amounts of at most 0.7 per cent by weight.
    Type: Grant
    Filed: October 18, 1976
    Date of Patent: July 1, 1980
    Assignee: Elfotec A.G.
    Inventor: Gabor Forgo
  • Patent number: 4199356
    Abstract: A transfer sheet on which toner images free of broadening of edge portions and having sharp contours can be transferred even in the electrophotography or electrostatic printing of the transfer type using conductive or semiconductive toners, i.e., magnetic toners, is disclosed. This transfer sheet is characterized in that a conductive or semiconductive toner-receiving face having a volume specific resistance of at least 3.times.10.sup.13 .OMEGA.-cm is formed on at least one surface of a substrate of the transfer sheet.
    Type: Grant
    Filed: January 27, 1975
    Date of Patent: April 22, 1980
    Assignee: Mita Industrial Company Limited
    Inventors: Shoji Matsumoto, Hitoshi Nishihama, Tatsuo Aizawa
  • Patent number: 4197129
    Abstract: A hydrophobic plastic support which has a layer thereon comprising a copolymer, said copolymer consisting essentially of an acrylic monomer selected from alkyl esters of acrylic acid and alkyl esters of methacrylic acid, and an ethylenically unsaturated monomer having a group of the formula--COXROHwherein X stands for an oxygen atom or ##STR1## in which R' stands for a hydrogen atom, a substituted or unsubstituted alkyl group or a hydroxy group, and R stands for a substituted or unsubstituted alkylene group.
    Type: Grant
    Filed: June 17, 1976
    Date of Patent: April 8, 1980
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Yasuji Muroi, Hideyasu Ohta, Masaru Kanbe, Jun Shirasaki
  • Patent number: T995007
    Abstract: Photographic film bases and sensitized photographic films are produced by coating a supporting film, especially a linear polyester film such as a biaxially oriented and heat-set film of polyethylene terephthalate, with a subbing composition comprising a polymer of a vinyl halogenoester, such as vinyl mono-, di-, or trichloroacetate, which is then subjected to a surface modifying, e.g. corona discharge, treatment. Light-sensitive photographic emulsions adhere directly to the treated subbing layer without the need for an intermediate gelatin subbing layer. The vinyl halogenoester subbing polymer may be a copolymer formed with a softening temperature-lowering comonomer such as an alkyl acrylate, alkyl methacrylate, polyalkylene oxide itaconate or maleate, vinyl alkyl ether, vinyl ester, alkene, alkadiene or alkyl styrene, a suitable copolymer being 78/15/7 mole % vinyl monochloroacetate/ethyl acrylate/acrylamide.
    Type: Grant
    Filed: April 26, 1979
    Date of Patent: June 3, 1980
    Assignee: Bexford Limited
    Inventor: David R. Mann