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| Number | Title | Issue Date |
| 8187781 | Resin-filled ferrite carrier for electrophotographic developer, production method thereof and electrophotographic developer using the ferrite carrier Employed are a resin-filled ferrite carrier for an electrophotographic developer filled with a resin in voids of a porous ferrite core material, wherein the resin filled in the voids is a silicone resin which has a softening point of 40° C. or above and is cured at... | 05/29/2012 |
| 8142972 | Developer for replenishment and image forming method Provided is a developer for replenishment capable of forming a high-quality image even upon duration. The developer for replenishment includes at least a toner and a magnetic carrier, and in the developer for replenishment, 1 part by mass of the magnetic carrier is ... | 03/27/2012 |
| 8026033 | Ferrite carrier for electrophotographic developer and electrophotographic developer Disclosed are a ferrite carrier for electrophotographic developer and an electrophotographic developer using the ferrite carrier, wherein: the ferrite carrier is a composite ferrite composed of Li and Mg; when the composition of the ferrite is calculated as a mixtur... | 09/27/2011 |
| 7906265 | Ferrite carrier for electrophotographic developer, method for producing the same, and electrophotographic developer A ferrite carrier for an electrophotographic developer having a compression breaking strength of 150 MPa or more, a rate of compressive change of 15.0% or more and a shape factor SF-1 of 100 to 125, a method for producing the same, and an electrophotographic develop... | 03/15/2011 |
| 7842448 | Method of forming fixed images A method of forming fixed images, including the step of applying a two-component developer containing a carrier and a toner containing a wax and a resin binder containing a crystalline polyester to a two-component development device with a linear speed of from 500 t... | 11/30/2010 |
| 7754408 | Synthetic carriers A carrier includes at least one magnetic material and a conductive material. The conductive material is at least one carbon nanotube. A developer includes a toner and the carrier. ... | 07/13/2010 |
| 7736827 | Developer recycling method In a method for recycling a double component developer that contains a carrier and a toner used for an image forming device such as office automation equipment, an economic value of recycling is increased, thereby allowing a company to carry out an active and sustai... | 06/15/2010 |
| 7476482 | Mg-based ferrite, an electrophotographic development carrier containing the ferrite, and developer containing the carrier This invention provides an Mg-based ferrite having a high dielectric breakdown voltage and a saturation magnetization suitable for electrophotographic development, a carrier containing the ferrite, and an electrophotographic developer containing the carrier. The Mg-... | 01/13/2009 |
| 7442483 | Ferrite carrier for electrophotographic developer and method for preparing the same, and electrophotographic developer using the same A ferrite carrier for the electrophotographic developer containing 40 to 500 ppm of zirconium; a method for preparing a ferrite carrier for the electrophotographic developer, comprising the steps for weighing, mixing, and pulverizing ferrite raw materials, and for g... | 10/28/2008 |
| 7288355 | Carrier for electrophotography developers, developer prepared by using the carrier and method for forming image Provided are a carrier for electrophotography developers prepared by generating a slight amount of byproducts such as water, alcohol, etc, which carrier is free from release of a magnetic powder, has excellent mechanical strength and durability, and good environment... | 10/30/2007 |
| 7288353 | Toner, developer, image developer and image forming apparatus A toner including toner particles including a binder resin, a colorant, and an inorganic particulate material present on a surface of the toner particles. The toner particles have a surface roughness (Ra) of from 1 to 30 nm, a standard deviation of the surface rough... | 10/30/2007 |
| 7252919 | Carrier and developer for latent electrostatic image development, container housing developer, image forming process, image forming apparatus, and process cartridge A carrier for electrostatic development contains a core particle and a coating layer covering the core particle, and the core particle is a ferrite particle containing at least one of Zr in an amount of 0.005% by mass to 5% by mass and Bi in an amount of 0.001% by m... | 08/07/2007 |
| 7226544 | Magnetite particles Magnetite particles (and their manufacturing method) that enable suppression of blooming caused because of their large coercive force when used as magnetic toner, exert a light environment load, and are excellent in cost. The magnetite particles contain 0.1 to 1 mas... | 06/05/2007 |
| 7183033 | Carrier core material, coated carrier, two-component developing agent for electrophotography, and image forming method A carrier core material for an electrophotographic developing agent, which comprises 100 parts by weight of a ferrite component represented by a formula (A) and 0.1 to 5.0 parts by weight of ZrO2 that is present in the ferrite component without forming a ... | 02/27/2007 |
| 7169334 | Optical information recording medium A compound constructed by N (N is an integer of 2 or more) kinds of phases containing at least one kind of elements selected from a group consisting of Co, Ti, V, Cr, Mn, Fe, Ni, Si, Pb, Bi and Al. At least one kind to (N−1) kinds among the N kinds of phases are c... | 01/30/2007 |
| 7144669 | Carrier and developer for latent electrostatic image development, container housing developer, image forming process, image forming apparatus, and process cartridge A carrier for electrostatic development contains a core particle and a coating layer covering the core particle, and the core particle is a ferrite particle containing at least one of Zr in an amount of 0.005% by mass to 5% by mass and Bi in an amount of 0.001% by m... | 12/05/2006 |
| 7144668 | Toner and two-component developer The present invention provides a toner: comprising a binder resin comprising a polyester unit, a colorant, a releasing agent, and inorganic fine particles; has a weight average particle diameter of 3.0–6.5 μm; has an average circularity of particles in the toner ... | 12/05/2006 |
| 7033720 | Development systems for magnetic toners and toners having reduced magnetic loadings Development systems and methods for developing using magnetic toner are disclosed. The present invention further discloses developers used in development systems as well as the toner used in developer for magnetic ink character recognition printing. With respect to ... | 04/25/2006 |
| 7014971 | Carrier compositions Carrier comprised of a mixture of a first carrier and a second carrier, and wherein the first carrier is comprised of a steel core and the second carrier is comprised of a magnetite. ... | 03/21/2006 |
| 6952489 | Fingerprint verification method having band detection A fingerprint verification method having band detection is provided. In one embodiment, the method includes capturing a fingerprint image and processing the image to determine if it includes bands attributable to changes in illumination intensity during image captur... | 10/04/2005 |
| 6936394 | Replenishing developer and developing method An electrostatic latent image on an image-bearing member is developed with a two-component developer comprising a toner and a carrier stored in a developer vessel while supplying as required a replenishing developer to the developer vessel. The replenishing develope... | 08/30/2005 |
| 6905806 | Dry two-component type developer for electrophotography A dry two-component developer for electrophotography comprising a carrier particle and a toner particle, wherein a toner water adsorption ratio (T) obtained by a following equation (1) for the toner particle ranges from 1.0 to 7.0 and a carrier water adsorption rati... | 06/14/2005 |
| 6723481 | Method for using hard magnetic carriers in an electrographic process Methods for development of an electrostatic image are disclosed that utilize developer compositions with hard magnetic carrier compositions which can provide improved development efficiencies and reduced amounts of image carrier pick-up. The methods utilize hard mag... | 04/20/2004 |
| 6677098 | Developer composition for non-interactive magnetic brush development An electrographic, two-component dry developer composition including charged toner particles and oppositely charged carrier particles which (a) includes: an combination of a soft magnetic material exhibiting a coercivity of at least 300 gauss when magneti... | 01/13/2004 |
| 6677096 | Positively chargeable toner for two-component development A positively chargeable toner for two-component development comprising a resin binder; a colorant; a releasing agent comprising a wax having a melting point of 50° to 120° C.; and an external additive comprising a positively chargeable silica, the posit... | 01/13/2004 |
| 6617089 | Developer composition for non-interactive magnetic brush development An electrographic, two-component dry developer composition comprising charged toner particles and oppositely charged carrier particles which (a) includes: a soft magnetic material exhibiting a coercivity of less than 300 gauss when magnetically saturated ... | 09/09/2003 |
| 6589703 | Electrographic methods using hard magnetic carrier particles Disclosed are methods and apparatus for electrographic development which utilize a rotating magnetic core, a toner shell disposed around the rotating magnetic core, and developer compositions disposed on the toner shell which include a hard magnetic mater... | 07/08/2003 |
| 6506531 | Magnetic carrier A magnetic carrier exhibiting excellent durability against mechanical impact as exerted by vibration and capable of exhibiting a stable charging performance in electrophotography is provided. The magnetic carrier is formed through a process including step... | 01/14/2003 |
| 6464797 | Method of separating electrophotographic carrier compositions and recycling the compositions A method for use in two-components electrostatic image developers is disclosed, in which secure separation of a carrier coating resinous materials from a core magnetic material is achieved without affecting the properties of the core materials through pro... | 10/15/2002 |
| 6294304 | Environmentally benign high conductivity ferrite carrier with widely variable magnetic moment A ferrite carrier includes manganese oxide, ferric oxide and minor amounts of titanium dioxide and provides an environmentally benign, highly conductive, reprographic carrier powder.... | 09/25/2001 |
| 6183925 | Two component developer comprising specific magnetic toner and specific magnetic carrier This invention provides a two-component developer comprising magnetic carrier particles and toner particles which contain magnetic particles at a specified content, being excellent in high speed copying system.... | 02/06/2001 |
| 5994016 | Dry developer for developing electrostatic latent image A color developer is described that contains a toner and a resin-coated carrier, wherein the toner contains a hydrophobic particulate titania and a charge controlling agent, and the charge controlling agent contains an aromatic hydroxycarboxylic acid meta... | 11/30/1999 |
| 5976747 | Ferrite carrier for electrophotographic developer and electrophotographic developer containing the same A ferrite carrier for electrophotographic developers which is represented by formula: (MnO)x (MgO)y (Fe2 O3)z wherein x+y+z=100 mol %, and part of MnO, MgO and/or Fe2 O3 is substitute... | 11/02/1999 |
| 5962175 | Binder-type carrier and method of manufacturing same A binder-type carrier which does not cause image defects or uneven density and has excellent production characteristics, and a binder-type carrier manufactured by said method. The binder-type carrier has a magnetic powder content of 75-90 wt % and is prod... | 10/05/1999 |
| 5885740 | Magnetite particles, a process for producing them and applications thereof Magnetite particles that contain 0.1-5.0 wt % of P, 0.1-5.0 wt % of Al and optionally up to 5.0 wt % of Si on the basis of Fe, that have ςr /SSA ratio of no more than 0.9 (ςr, residual magnetic flux density; SSA, specific surface a... | 03/23/1999 |
| 5824445 | Process for producing image and two-component developer A process for producing an image comprising the steps of: electrically charging a photoreceptor under dark; forming a latent image on the photoreceptor through selective imagewise exposure to light; and developing the latent image with a two-component dev... | 10/20/1998 |
| 5795692 | Carrier composition and processes thereof A carrier composition comprised of a core comprised of a magnetic oxide with a coating thereover comprised of the reaction product of a metal, preferably a zinc vapor and the magnetic oxide.... | 08/18/1998 |
| 5789129 | Ferrite carrier for electrophotographic development A ferrite carrier for use in electrophotographic development of electrostatic latent images, which comprises a ferrite particles having an average particle size of 10 to 100 μm, a specific resistivity of 106 Ω.cm or more and a chemical compos... | 08/04/1998 |
| 5712069 | Two-component type developer, developing method and image forming method A two-component type developer for developing an electrostatic image is constituted by at least a toner and a magnetic carrier. The toner has a weight-average particle size D4 of 1-10 μm, a number-average particle size D1 and such a particle size distrib... | 01/27/1998 |
| 5663027 | Two-component developer comprising specific magnetic toner and specific magnetic carrier This invention provides a two-component developer comprising magnetic carrier particles and toner particles which contain magnetic particles at a specified content, being excellent in high speed copying system.... | 09/02/1997 |
