Dry Powder Developing Patents (Class 430/120.1)
  • Patent number: 8652743
    Abstract: Electrophotographic printing of one or more layers of toner to enable the printing of a wide range of toner mass laydown using electrophotography to produce prints with raised letters. This method encompasses the steps of forming multicolor toner images and fusing the print one or more times to create the raised print having the desired height of raised print.
    Type: Grant
    Filed: February 18, 2010
    Date of Patent: February 18, 2014
    Assignee: Eastman Kodak Company
    Inventors: Dinesh Tyagi, Louise Granica, Thomas N. Tombs, Donald S. Rimai
  • Publication number: 20130295351
    Abstract: A color toner image with a metallic effect can be prepared by forming one or more latent images and developing them with metallic dry toner particles and color toner particles. The developed color toner image can be transferred to a receiver material, and fixed to provide a color toner image with a metallic effect. The metallic dry toner particles have a polymeric binder phase and non-conductive metal oxide particles dispersed therein. Before fixing, the metallic dry toner particle has a mean volume weighted diameter (Dvol) 15-40 ?m and the non-conductive metal oxide particles are present in an amount of at least 20-50 weight % based on total metallic dry toner particle weight. The ratio of the metallic dry toner particle Dvol to the average equivalent circular diameter (ECD) of the non-conductive metal oxide particles in the metallic dry toner particles is greater than 0.1 and up to and including 10.
    Type: Application
    Filed: April 30, 2013
    Publication date: November 7, 2013
    Inventors: Dinesh Tyagi, Kevin D. Lofftus, Louise Granica, Richard George Allen
  • Patent number: 8512932
    Abstract: Methods are provided for drying a particle. Specifically, there is provided a spray-dried diketopiperazine-insulin particle formulation having improved aerodynamic performance and in which the active agent is more stabile and efficiently delivered as compared to that of the lyophilized diketopiperazine-insulin formulation. The dry powders have utility as pharmaceutical formulations for pulmonary delivery.
    Type: Grant
    Filed: September 22, 2011
    Date of Patent: August 20, 2013
    Assignee: MannKind Corporation
    Inventors: Bryan R. Wilson, Marshall Grant
  • Patent number: 8512929
    Abstract: A latent electrostatic image developing carrier including a carrier core material, and a coating layer containing a resin and provided on a surface of the carrier core material, wherein the coating layer includes a particulate material containing at least first fine conductive particles and second fine conductive particles, and wherein the first fine conductive particles and the second fine conductive particles satisfy the relationships expressed by Expressions 1 and 2, 3?D1/D2?15 . . . Expression 1, where D1 denotes a dispersed particle diameter of the first fine conductive particles and D2 denotes a dispersed particle diameter of the second fine conductive particles, and ?7E?R1×R2?8E . . . Expression 2, where R1 denotes a powder specific resistance of the first fine conductive particles and R2 denotes a powder specific resistance of the second fine conductive particles.
    Type: Grant
    Filed: September 10, 2010
    Date of Patent: August 20, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Hitoshi Iwatsuki, Kimitoshi Yamaguchi, Minoru Masuda, Yutaka Takahashi, Koichi Sakata, Toyoaki Tano
  • Patent number: 8512931
    Abstract: A toner comprising toner particles having at least one type of surface additive, the toner particles having an FPIA average circularity of at least 0.95, whereby at least 80% wt of the total amount of surface additives stays onto the surface of the toner particles when an ultrasonic treatment of 4500 to 4700 J/gram of toner is applied; a substrate printed or marked with the above-described toner; and a method for manufacturing a toner, said method including the steps of: mixing a binder resin, a colorant and optionally other additives, thereby forming a mixture, melting, kneading and milling said mixture, thereby obtaining a melted kneaded product, pulverizing said melted kneaded product, adding at least one surface additive before or while bringing the FPIA average circularity of said toner particles to 0.
    Type: Grant
    Filed: November 19, 2010
    Date of Patent: August 20, 2013
    Assignee: Xeikon Manufacturing N.V.
    Inventors: Lode Deprez, Werner Op De Beeck, Karlien Torfs
  • Patent number: 8383315
    Abstract: Electrophotographic printing of one or more layers of toner to enable the printing of a wide range of toner mass laydown using electrophotography to produce prints with raised letters. This method encompasses the steps of forming multicolor toner images and fusing the print one or more times to create the raised print, having the desired height of raised print.
    Type: Grant
    Filed: February 18, 2010
    Date of Patent: February 26, 2013
    Assignee: Eastman Kodak Company
    Inventors: Dinesh Tyagi, Thomas N. Tombs, Donald S. Rimai
  • Patent number: 8298734
    Abstract: An electrophotographic photoreceptor including a conductive substrate and a photosensitive layer located overlying the conductive substrate. The photosensitive layer comprises a specific diamine compound.
    Type: Grant
    Filed: November 6, 2009
    Date of Patent: October 30, 2012
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomoyuki Shimada, Naohiro Toda, Yoshinori Inaba
  • Patent number: 8241826
    Abstract: Disclosed is a full-color image forming method by which an image exhibiting comfortable image quality reliably suitable for a human visual system can be obtained in such a way that a halftone image exhibiting excellent granularity and evenness thereof is acquired.
    Type: Grant
    Filed: May 1, 2009
    Date of Patent: August 14, 2012
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Shiro Hirano, Mikio Kouyama, Kenji Hayashi, Hiroyuki Yasukawa
  • Patent number: 8216754
    Abstract: An electrostatic-image-developing toner includes: a binder resin; and a yellow pigment in an amount of from about 5 to about 50 ppm.
    Type: Grant
    Filed: May 19, 2009
    Date of Patent: July 10, 2012
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yusuke Ikeda, Susumu Yoshino, Masanobu Ninomiya, Yukiaki Nakamura, Yasuo Kadokura
  • Patent number: 8039431
    Abstract: Methods are provided for drying a particle. Specifically, there is provided a spray-dried diketopiperazine-insulin particle formulation having improved aerodynamic performance and in which the active agent is more stabile and efficiently delivered as compared to that of the lyophilized diketopiperazine-insulin formulation. The dry powders have utility as pharmaceutical formulations for pulmonary delivery.
    Type: Grant
    Filed: February 22, 2007
    Date of Patent: October 18, 2011
    Assignee: MannKind Corporation
    Inventors: Bryan R. Wilson, Marshall Grant
  • Publication number: 20110217652
    Abstract: A process for coating a substrate comprising the sequential steps of (i) providing a transfer sheet provided with clear coat layer and a printed powder coating, toner, or UV-curable ink on top of that, (ii) applying the transfer sheet onto the substrate with the coating in contact with the substrate, and (iii) curing the coating on the substrate.
    Type: Application
    Filed: October 20, 2009
    Publication date: September 8, 2011
    Applicant: Akzo Nobel Coatings International B.V.
    Inventor: Kevin Jeffrey Kittle
  • Patent number: 7968267
    Abstract: The purpose is to provide, in a development apparatus using a two-component developer, a compact development apparatus, image forming apparatus and development method that prevents carrier deterioration and that can carry out good image formation over a long time period. In a development apparatus using a developer in which are mixed a toner, a carrier, and opposite polarity particles that are charged to a polarity opposite to the charging polarity of the toner, the surface charge density of the opposite polarity particles should be in the range of 0.5 to 3.0 times the surface charge density of the carrier.
    Type: Grant
    Filed: April 28, 2010
    Date of Patent: June 28, 2011
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Takeshi Maeyama, Toshiya Natsuhara, Junya Hirayama, Masahiko Matsuura, Shigeo Uetake
  • Patent number: 7939235
    Abstract: A toner includes a polyol-based resin having multiple hydroxyl groups in a molecular chain thereof in which a ratio of epoxy group to hydroxyl group is from 0.990 to 1.010. A stirring and transfer device satisfies 1000000??×?×??16000000, wherein ? represents a number of rotation per minute, ? (mm) represents a pitch and ? (mm) represents a transfer path length of the stirring and transfer device. A temperature Tin (° C.) in a development device during stirring and transfer of a two component developing agent satisfies 3020 C.<Tin<60° C., and the toner satisfies Y??0.5X+45, 5?X<40, 5?Y?35, wherein X (%) represents a degree of agglomeration of a mother toner particle and Y (%) represents a degree of agglomeration of the toner which has been preserved at 55° C. for 24 hours.
    Type: Grant
    Filed: March 13, 2008
    Date of Patent: May 10, 2011
    Assignee: Ricoh Company Limited
    Inventors: Takahiro Honda, Hiroyuki Fushimi, Fumihiro Sasaki, Hisashi Nakajima, Hiroshi Yamada, Yasuo Asahina
  • Publication number: 20110065037
    Abstract: A latent electrostatic image developing carrier including a carrier core material, and a coating layer containing a resin and provided on a surface of the carrier core material, wherein the coating layer includes a particulate material containing at least first fine conductive particles and second fine conductive particles, and wherein the first fine conductive particles and the second fine conductive particles satisfy the relationships expressed by Expressions 1 and 2, 3?D1/D2?15 . . . Expression 1, where D1 denotes a dispersed particle diameter of the first fine conductive particles and D2 denotes a dispersed particle diameter of the second fine conductive particles, and ?7E?R1×R2?8E . . . Expression 2, where R1 denotes a powder specific resistance of the first fine conductive particles and R2 denotes a powder specific resistance of the second fine conductive particles.
    Type: Application
    Filed: September 10, 2010
    Publication date: March 17, 2011
    Inventors: Hitoshi Iwatsuki, Kimitoshi Yamaguchi, Minoru Masuda, Yutaka Takahashi, Koichi Sakata, Toyoaki Tano
  • Patent number: 7862977
    Abstract: A method to form an image using a trickle developing system, wherein (a) the toner comprises colorant particles with a volume median diameter of 3 to 8 ?m having first inorganic particles on surfaces of the colorant particles to form toner particles; (b) the carrier comprises magnetic particles with a weight average particle diameter (D4) of 20 to 40 ?m having second inorganic particles on surfaces of the magnetic particles to form carrier particles; and (c) an area ratio of element (A) based on a total area of surfaces of the carrier particles is 0.5 to 3.0 area % determined by using an X-ray analysis, provided that element (A) represents one or more elements commonly contained in the first inorganic particles and in the second inorganic particles.
    Type: Grant
    Filed: April 3, 2007
    Date of Patent: January 4, 2011
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Makoto Kobayashi, Yoshiyasu Matsumoto
  • Patent number: 7853161
    Abstract: A potential difference between the photoreceptor and the development roller is set at a value at which the normally charged toner on the development roller can be flown toward the photoreceptor in the development phase at the time of compulsorily consuming the toner, and this potential difference is set at a value at which the flown normally charged toner can be returned to the development roller in the recovery phase.
    Type: Grant
    Filed: December 11, 2008
    Date of Patent: December 14, 2010
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Toru Hayase, Kuniya Matsuura, Yuusuke Okuno, Kentaro Katori, Hiromasa Ueno, Hideaki Hayashi
  • Publication number: 20100248130
    Abstract: An image forming method comprising the step of: forming a toner image employing toner particles containing at least a resin on an image supporting substrate having thereon a toner holding layer via a toner image holding process to form an image print, the toner image being held in the toner holding layer in the toner image holding process, wherein at least the toner particles or the image supporting substrate is separated from the image print via a separation process; and at least the separated toner particles or the separated image supporting substrate is recyclable as an image forming material.
    Type: Application
    Filed: March 15, 2010
    Publication date: September 30, 2010
    Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.
    Inventors: Mitsutoshi NAKAMURA, Shigenori KOUNO, Masaharu MATSUBARA
  • Patent number: 7741001
    Abstract: A process for preparing a toner for electrostatic image development, the process comprising the steps of: (S1) mixing an aqueous pigment dispersion and an aqueous resin particle dispersion containing self-dispersible polyester resin particles as a binder resin to prepare a mixture; and (S2) adding a polyvalent metal salt as a flocculant to the mixture while stirring to form aggregates of the pigment bonded to the resin particles, wherein the self-dispersible polyester resin is prepared by reacting a carboxylic acid compound with an alcohol compound inclusive of a polyhydric alcohol, the carboxylic acid compound being one or more of a polycarboxylic acid having three or more carboxyl groups and its anhydride.
    Type: Grant
    Filed: April 3, 2006
    Date of Patent: June 22, 2010
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Takanori Kamoto
  • Patent number: 7725057
    Abstract: Disclosed is an image forming method, containing a development step of developing an electrostatic latent image formed on an electrostatic image supporting material using a toner formed on a development sleeve in the from of a thin layer to form a toner image, wherein a ten-point average roughness Rz on the surface of the development sleeve is from 3.0 to 5.7 ?m, a volume average particle size of toner particles is from 6.0 to 8.0 ?m, the content of a volume average particle size of the toner particles of 5.0 ?m or less is from 2.2 to 11.0% by volume, a shape coefficient SF-1 of the toner particles that is measured by an image-analyzing apparatus satisfies the relation: 115?SF-1?155, and a shape coefficient SF-2 of the toner particles that is measured by an image-analyzing apparatus satisfies the relation: 112?SF-2?150.
    Type: Grant
    Filed: March 28, 2007
    Date of Patent: May 25, 2010
    Assignee: Kyocera Mita Corporation
    Inventor: Takashi Nagai
  • Patent number: 7704663
    Abstract: An image forming method comprises: supplying an image support onto an imaging site, the image support comprising a substrate, a light-scattering layer containing a white pigment and a first thermoplastic resin comprising a polyolefin-based resin, and a toner-receiving layer containing a second thermoplastic resin comprising a mixture of a crystalline resin and an amorphous resin, in this order, forming a colored toner image on the image support with a colored toner containing a third thermoplastic resin; and forming a transparent toner image on the image support having the colored toner image formed thereon with a transparent toner containing a fourth thermoplastic resin having a glass transition temperature of from not lower than about 50° C. to lower than about 70° C.
    Type: Grant
    Filed: April 12, 2006
    Date of Patent: April 27, 2010
    Assignee: Fuji Xerox Co., Ltd.
    Inventor: Osamu Ide
  • Patent number: 7695885
    Abstract: A negatively-chargeable non-magnetic one-component developer for developing an electrostatic latent image using a contact DC-bias development method, having a capacitance of 1.05×10?12 to 1.25×10?12 F, a volume resistivity of 5.0×1010 to 5.0×1012 ?·cm and a dielectric loss tangent of 1.0×10?3 to 2.0×10?2. In a contact DC-bias development method, the developer has a capacitance of 1.30×10?12 to 1.60×10?12 F, a resistivity of 5.0×109 to 5.0×1010 ?·cm and a dielectric loss tangent of 1.0×10?3 to 2.0×10?2. In a non-contact DC/AC-bias development method, the developer has a capacitance of 1.45×10?12 to 1.60×10?12 F, a resistivity of 5.0×109 to 1.0×1010 ?·cm and a dielectric loss tangent of 1.0×10?3 to 2.0×10?2.
    Type: Grant
    Filed: January 18, 2007
    Date of Patent: April 13, 2010
    Assignee: Ricoh Company Limited
    Inventors: Hideaki Yasunaga, Minoru Nakamura, Masayuki Hagi, Takuya Kadota, Hiroaki Katoh, Yoshihiro Mikuriya, Katsunori Kurose, Atsushi Yamamoto, Masahide Inoue
  • Patent number: 7592117
    Abstract: A method comprising generating a clear layer on a first surface using a transparent liquid toner, generating a color layer using a pigmented liquid toner over the clear layer on the first surface, and transferring the clear layer and the color layer from the first surface to a substrate is provided.
    Type: Grant
    Filed: June 16, 2005
    Date of Patent: September 22, 2009
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Bruce J. Jackson, Judson Leiser, Peter Gysling
  • Patent number: 7560211
    Abstract: The present invention provides a toner for electrostatic charge development comprising an amorphous polyester resin, a releasing agent, and magnetic metal particles covered with a resin the main component of which is a crystalline polyester resin.
    Type: Grant
    Filed: August 10, 2006
    Date of Patent: July 14, 2009
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Takao Ishiyama, Hiroshi Nakazawa, Masanobu Ninomiya
  • Publication number: 20090176171
    Abstract: In a disclosed image forming apparatus, a developing bias applied to a developer carrier or exposure energy with which an image carrier is exposed is adjusted such that an isolated one-dot image on the image carrier has a predetermined image density. When the image carrier is exposed to form dot images continuously arranged in a sub scanning direction, the exposure time period for each dot image is shorter than a time period for exposing the image carrier to form the isolated one-dot image.
    Type: Application
    Filed: December 22, 2008
    Publication date: July 9, 2009
    Inventors: Yoshiko OGAWA, Akihiro Kawasaki
  • Patent number: 7515860
    Abstract: An image forming apparatus comprising: a latent image support for supporting a latent image and a developing device configured to us toner to develop the latent image on said latent image support, the estimated average halftone granularity of the toner imager after developing being 0.25 or less.
    Type: Grant
    Filed: August 2, 2007
    Date of Patent: April 7, 2009
    Assignee: Ricoh Company, Ltd.
    Inventors: Koji Suzuki, Mitsuo Aoki, Bing Shu, Yasushi Koichi, Setsuo Soga, Tadashi Kasai, Yutaka Takahashi
  • Patent number: 7509079
    Abstract: A toner for forming a visual image on an image bearer having a maximum shearing stress of about 30 G (N/m2) when a maximum shearing stress test is performed using a uniaxial collapsing stress measuring method and a vertical stress 16 G (N/m2) is applied. Alternatively the toner has a uniaxial collapsing stress of about 50 G (N/m2).
    Type: Grant
    Filed: July 7, 2006
    Date of Patent: March 24, 2009
    Assignee: Ricoh Company, Ltd.
    Inventors: Satoshi Muramatsu, Nobuo Kasahara, Nobuo Iwata, Junichi Matsumoto
  • Patent number: 7459257
    Abstract: An image forming apparatus of the present invention comprises an image carrier, a lubricant application device that applies a first lubricant to the image carrier surface, and a developing device that houses a developer to which a second lubricant is added and develops the electrostatic latent image formed on the image carrier. Here, the pure water contact angle ?1 of the first lubricant and the pure water contact angle ?2 of the second lubricant have the following relationship, ?1??2. Furthermore, a frictional coefficient of the second lubricant may be larger than a frictional coefficient of the first lubricant.
    Type: Grant
    Filed: December 9, 2004
    Date of Patent: December 2, 2008
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Yasuo Shirodai, Kuniaki Kashiwakura
  • Patent number: 7449267
    Abstract: An electrophotographic image forming method is disclosed. The method contains steps of forming an electrostatic latent image on an organic photoreceptor, and developing the electrostatic latent image by a developer containing toner to form a toner image on the photoreceptor. In this method the photoreceptor contains inorganic particles in a surface layer, the toner has circle equivalent diameter d of 3.0 to 8.0 ?m viewed from a direction which maximizes the projective area of toner particles, the toner has a flatness ratio d/t of 2.0 to 5.0, wherein d is circle equivalent diameter and t is average thickness of toner particles, and the electrostatic latent image is developed in such a manner that the developing sleeve is rotated in the opposite direction to the photoreceptor.
    Type: Grant
    Filed: August 31, 2005
    Date of Patent: November 11, 2008
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Akihiko Itami, Masao Asano, Hiroshi Yamazaki
  • Patent number: 7445878
    Abstract: A toner for developing an electrostatic charge image comprising a compound represented by a following formula (1): wherein X represents H or —CO—R4; R4 represents an alkyl group having 1 to 4 carbon atoms and the alkyl group may have a substituent; R1 though R3 independently represent an alkyl group having 10 to 30 carbon atoms and the alkyl group may have a substituent; and R1 through R3 may be either the same or different.
    Type: Grant
    Filed: September 13, 2005
    Date of Patent: November 4, 2008
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Mikio Koyama, Kenji Hayashi, Kazuya Isobe, Yasuharu Saita
  • Patent number: 7422833
    Abstract: A charge control resin composition for positive or negative charge, which is prepared either by mixing and kneading a charge control resin for positive or negative charge with a colorant, or by mixing and kneading the above combination further with a charge control resin for opposite charge or a charge control resin composition for opposite charge; wherein colorant particles are finely dispersed as desired. The resultant mixture is mixed with a polymerizable monomer to obtain polymerizable monomer composition. Then, the polymerizable monomer composition is dispersed or emulsified in an aqueous dispersion medium containing a dispersion stabilizer, and polymerized to obtain a toner.
    Type: Grant
    Filed: September 27, 2001
    Date of Patent: September 9, 2008
    Assignee: Zeon Corporation
    Inventors: Kazu Niwa, Fuminari Oyama
  • Patent number: 7413842
    Abstract: A toner process comprising aggregating or coagulating a latex emulsion comprising a resin, a colorant and wax particles using an amount of polymetal ion coagulant to provide core particles; heating the core particles to provide micron size aggregates; optionally adding a second resin emulsion; adding a sequestering or complexing component and a base to remove the polymetal ion in a controlled manner; further heating the mixture to provide toner particles; and optionally, isolating the toner particles.
    Type: Grant
    Filed: August 22, 2005
    Date of Patent: August 19, 2008
    Assignee: Xerox Corporation
    Inventors: Daryl Vanbesien, David J. Sanders, Raj D. Patel, Christine D. Anderson, Patricia Ann Burns, Nam-Suk Ro
  • Patent number: 7396629
    Abstract: An image forming method and an image forming apparatus are disclosed in which an electrostatic latent image is formed on a photosensitive member surface by using a two-component developer including a toner and carrier. The photosensitive member surface has a specific modulus of elastic deformation and includes a charge transport layer with a specific thickness. The toner has a specific weight-average particle diameter. The carrier has a specific volume-average particle diameter and a specific circularity, and contains 20% by number or less of particles having a value of “average circularity?2?” where ? is standard deviation of carrier circularity.
    Type: Grant
    Filed: April 26, 2005
    Date of Patent: July 8, 2008
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yoshinobu Baba, Hiroyuki Fujikawa, Nobuyoshi Sugahara, Koh Ishigami, Naoki Okamoto, Takayuki Itakura
  • Patent number: 7378212
    Abstract: An image forming method comprising the steps of; forming a latent image by exposing an organic photoreceptor to light, and developing the latent image by a developer containing a toner to form a toner image, wherein the organic photoreceptor has a surface layer comprising a binder and fluororesin fine particles having an average primary particle diameter of not less than 0.02 ?m and less than 0.20 ?m and a crystallinity of less than 90%, and has a contact angle for water of 90° or more; and toner particles of the toner has a particle diameter below 0.7×(Dp50) being 10 number percents, Dp50 being 50% number particle diameter. An embodiment may be an organic photoreceptor, which comprises a conductive support; a photosensitive layer provided on the conductive support; and a surface layer containing a binder and a fluorine-containing resin fine particle having a number average primary particle diameter between about 0.02 ?m and about 0.
    Type: Grant
    Filed: July 1, 2005
    Date of Patent: May 27, 2008
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Keiichi Inagaki, Shigeaki Tokutake
  • Patent number: 7374853
    Abstract: Disclosed is a photoreceptor comprising a cylindrical substrate and a photosensitive layer. The substrate wherein the cylindrical substrate has a cylindricity of 5 to 40 ?m, and the photoreceptor satisfies the relation of 0<(PWS/P2)<5.0×10?4 mm?1, wherein PWS is an average value of power spectrum values of regular reflection light amount in a region of a space frequency from 0 to 2 mm?1 measured at the wave length of imagewise exposing light to the photoreceptor, and P is an average value of reflection light at the measuring point of the photoreceptor. An image forming method employing the photoreceptor is also disclosed, which comprises developing a latent image formed on the photoreceptor, with a developer comprising a toner including toner particles having a variation coefficient of shape coefficient of not more than 16%.
    Type: Grant
    Filed: December 2, 2004
    Date of Patent: May 20, 2008
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventor: Shigeki Takenouchi
  • Publication number: 20080038656
    Abstract: A negatively-chargeable non-magnetic one-component developer for developing an electrostatic latent image using a contact DC-bias development method, having a capacitance of 1.05×10?12 to 1.25×10?12 F, a volume resistivity of 5.0×1010 to 5.0×1012 ?·cm and a dielectric loss tangent of 1.0×10?3 to 2.0×10?2. In a contact DC-bias development method, the developer has a capacitance of 1.30×10?12 to 1.60×10?12 F, a resistivity of 5.0×109 to 5.0×1010 ?·cm and a dielectric loss tangent of 1.0×10?3 to 2.0×10?2. In a non-contact DC/AC-bias development method, the developer has a capacitance of 1.45×10?12 to 1.60×10?12 F, a resistivity of 5.0×109 to 1.0×1010 ?·cm and a dielectric loss tangent of 1.0×10?3 to 2.0×10?2.
    Type: Application
    Filed: January 18, 2007
    Publication date: February 14, 2008
    Inventors: Hideaki YASUNAGA, Minoru Nakamura, Masayuki Hagi, Takuya Kadota, Hiroaki Katoh, Yoshihiro Mikuriya, Katsunori Kurose, Atsushi Yamamoto, Masahide Inoue
  • Patent number: 7315703
    Abstract: An image forming apparatus includes an image bearing body and a developer bearing body. A transferring section transfers, onto a medium, a developer image formed on the image bearing body by development of the latent image. A voltage applying section alternately applies, to the developer bearing body, a first voltage for making the developer move from the developer bearing body toward the image bearing body in order to develop the latent image, and a second voltage for making the developer move from the image bearing body toward the developer bearing body. An image darkness adjusting section adjusts a darkness of the image to be formed on the medium by changing only the second voltage.
    Type: Grant
    Filed: August 8, 2005
    Date of Patent: January 1, 2008
    Assignee: Seiko Epson Corporation
    Inventor: Tomohiro Aruga
  • Patent number: 7270918
    Abstract: The invention relates to printing of documents, for example bank checks. According to the various aspects of the invention, a printing system, process and product with microprinting are provided. Documents printed as described may include digitally variable microprint and other enhancements. The invention is particularly useful for enhanced security documents and the production thereof.
    Type: Grant
    Filed: November 18, 2004
    Date of Patent: September 18, 2007
    Assignee: Eastman Kodak Company
    Inventors: Jeffrey C. Blood, Leonard R. Christopher, John F. Crichton, Thomas M. Plutchak, Gregory Rombola
  • Patent number: 7267864
    Abstract: The present invention provides an image supporting material for fixably supporting a color toner image, the material including a base material, a light scattering layer provided on the base material and containing a white pigment and a thermoplastic resin, and a color toner receptive layer provided on the light scattering layer and containing at least a thermoplastic resin, wherein the thermoplastic resin in the light scattering layer is constituted of a polyolefin or a polyolefinic copolymer having a temperature, at which viscosity becomes 5×103 Pa·s, of 100° C. or higher, and the thermoplastic resin in the color toner receptive layer is constituted of a resin obtained by melt mixing of a crystalline polyester resin and an amorphous resin and having a temperature, at which viscosity becomes 103 Pa·s, equal to or higher than 65° C. but lower than 80° C.
    Type: Grant
    Filed: September 15, 2004
    Date of Patent: September 11, 2007
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Osamu Ide, Shigeru Hayashi, Katsumi Daimon
  • Publication number: 20070148576
    Abstract: The present invention provides a toner for electrostatic charge development comprising an amorphous polyester resin, a releasing agent, and magnetic metal particles covered with a resin the main component of which is a crystalline polyester resin.
    Type: Application
    Filed: August 10, 2006
    Publication date: June 28, 2007
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Takao Ishiyama, Hiroshi Nakazawa, Masanobu Ninomiya