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| Number | Title | Issue Date |
| 8043781 | Toner, two-component developer and image formation device A toner comprising a small-particle diameter external additive having a number average particle diameter of 7 to 20 nm, a large-particle diameter external additive having a number average particle diameter of 40 to 80 nm and a toner particle having a volume average ... | 10/25/2011 |
| 7939233 | Magnetic carrier and two-component developer A magnetic carrier and a two-component developer are provided which have remedied blank areas, fog after leaving, carrier sticking during running, and image density variations before and after running. The magnetic carrier has magnetic carrier particles having at le... | 05/10/2011 |
| 7927775 | Magnetic carrier and two component developer Provided is a magnetic carrier giving a high quality image free of density variation without the occurrence of fogging or carrier adhesion and having excellent dot reproducibility even during long-term use. The magnetic carrier has magnetic carrier particles produce... | 04/19/2011 |
| 7553597 | Carrier core material, coated carrier, and two-component developing agent for electrophotography A carrier core material containing at least one metal oxide (MLO) having a melting point of not higher than 1000° C. and at least one metal oxide (MHO) having a melting point of not lower than 1800° C., wherein the metal (MH) for c... | 06/30/2009 |
| 7452649 | Magnetic toner, and image forming method A magnetic toner is provided having at last a binder resin and a magnetic material and having a weight-average particle diameter of 3 μm to 10 μm. The magnetic material has been surface-treated with a low-softening substance (A), and has a compressibility of 35 or... | 11/18/2008 |
| 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 |
| 7354688 | Toner compositions with surface additives A toner composition includes a binder, a colorant, and a surface additive package including a polydimethylsiloxane surface treated silica, a surface treated titania, and calcium sterate. The toner composition provides improved triboelectric charging properties. ... | 04/08/2008 |
| 7320852 | Carrier for developer for developing electrostatic latent image, developer using same and image forming method using same A carrier for use with a toner as a two-component type developer for developing an electrostatic image, comprising spherical magnetic core particles, and a resin layer covering each of said core particles and containing at least two resistance controlling materials ... | 01/22/2008 |
| 7288352 | Toner compositions with surface additives A toner composition including a binder, a colorant, and a surface additive package including a surface treated silica, a surface treated titania, and magnesium stearate. ... | 10/30/2007 |
| 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 |
| 7279262 | Magnetic carrier and two-component developer A magnetic carrier composed of carrier particles is provided in which each carrier particle has a carrier core including magnetic fine particles and a binder resin with the carrier core surface being coated with a coat material containing a coat resin. In the magnet... | 10/09/2007 |
| 7179577 | Carrier for developer for developing electrostatic latent image, image forming method using same and image forming apparatus using same A carrier for an image developer for electrophotography, including core particles, and a coating layer covering each of the core particles, wherein the core particles have a weight average particle diameter of Dv which is 25–45 μm and a number average particle di... | 02/20/2007 |
| 7166404 | Carrier for developer for developing electrostatic latent image, image forming method using same and image forming apparatus using same A carrier for an image developer for electrophotography, including core particles, and a coating layer covering each of the core particles, wherein the core particles have a weight average particle diameter of Dv which is 25–45 μm and a number average particle di... | 01/23/2007 |
| 7162187 | Image forming apparatus and image forming method In an image forming apparatus, a toner image is formed on a photosensitive element and a transfer roller, which carries a transfer medium, is pressed against a photosensitive element at a pressure of from 20.4 N/cm2 to 200 N/cm2. ... | 01/09/2007 |
| 7122221 | Method and apparatus for metal vapor coating A method and apparatus for coating a substrate (4) with a metal coating by vaporizing the metal in an enclosure (1) containing a selected gas and the substrate. The vaporized metal is deposited on the surface of the substrate either in a solid or molte... | 10/17/2006 |
| 7109256 | Surface-modified inorganic oxide powder, process for producing the same, and use thereof A surface modified inorganic oxide powder is provided, which includes inorganic oxide particles having a surface modified with a mixed solution, which includes an organopoly-siloxane and a silane compound, in the presence of an acid or a base. ... | 09/19/2006 |
| 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 |
| 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 |
| 6841327 | Developing assembly, image-forming apparatus and process cartridge In a developing assembly including a two-component developer container and a developer-carrying member, the developer-carrying member has at least a substrate and a resin coat layer formed on the substrate surface, and the resin-coat layer contains at least a binder... | 01/11/2005 |
| 6740461 | Carrier and two-component developer for electrophotography A carrier is composed of carrier particles, each carrier particle having a core particle containing at least a magnetic material and a surface coating layer provided on the core particle containing at least a resin, the surface coating layer being constituted of a p... | 05/25/2004 |
| 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 |
| 6650858 | Developing apparatus featuring first and second developing systems A developing apparatus includes a first developing system for developing a latent image formed on an image bearing member with a first developer including magnetic toner. The first developing system includes a first developer carrying member for carrying ... | 11/18/2003 |
| 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 |
| 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 |
| 6405007 | Magnetic particles for charging, process for producing the magnetic particles, and charging member, process cartridge and image-forming apparatus which have the magnetic particles Magnetic particles for charging an image-bearing member electrostatically. The charging magnetic particles have magnetic particles, first surface coat layers containing a first surface coating agent and covering the surfaces of the magnetic particles and ... | 06/11/2002 |
| 6326118 | Surface alloyed cores for electrostatographic carriers and developers A carrier and developer material for use in an electrostatographic imaging process comprises a metallic core material which has a diffusion-bonded surface alloy layer on the surface of the particle and an optional polymer layer overcoating the alloy layer... | 12/04/2001 |
| 6177221 | Carrier and developer providing offset lithography print quality A carrier for a developer composition includes a steel core having a shape factor of 6 or more coated with a coating at a coating weight of from 0.1 to 3.0% by weight of a total core weight. The coating is most preferably polymethyl methacrylate. The stee... | 01/23/2001 |
| 6165663 | Magnetic coated carrier two-component type developer and developing method A magnetic coated carrier suitable for constituting a two-component type developer for use in electrophotography is composed of magnetic coated carrier particles comprising magnetic coated carrier particles comprising magnetic carrier core particles each ... | 12/26/2000 |
| 6134413 | Carrier for magnetic developer and method of electrophotographically forming visual image A magnetic carrier for a developer used in electrostatically forming a visual image, comprising a magnetic core material, an electrically-conductive particle-containing resin layer and electrically-conductive particles externally added to the electri... | 10/17/2000 |
| 6124067 | Magnetic carrier, two-component developer and image forming method A magnetic carrier constituting a two-component developer for use in an electrophotographic image forming method is formed of a carrier core comprising a first resin and magnetic fine particles dispersed in the first resin, and a second resin surface-coat... | 09/26/2000 |
| 6103437 | Magnetic toner particles comprising magnetite particles containing silicon Magnetite particles of the present invention have an average particle diameter of 0.05 to 0.50 μm, each of the magnetite particles having a plurality of mountain-shaped protrusions with unsharpened crests on a surface of each magnetite particle, and the ... | 08/15/2000 |
| 6051352 | Carrier for developing electrostatic image, developer and developing method A carrier for developing an electrostatic latent image is disclosed. The carrier comprises a magnetite core and a resin coated on the magnetite core wherein the magnetite core contains FeO and Fe2 O3, the mole ratio of FeO/Fe2 | 04/18/2000 |
| 6007956 | Carrier and developer for developing electrostatic latent images The present invention relates a carrier comprising: a core particle comprising a binder resin and a first magnetic powder dispersed therein; and a second magnetic powder adhered onto the surface of the core particle, said second magnetic powder having a r... | 12/28/1999 |
| 6004715 | Toner for developing electrostatic images A toner for developing an electrostatic latent image, which includes ground toner particles having physical properties meeting with at least one of the following conditions (a) and (b): (a) the toner particles have an average surface roughness of at least 0.89... | 12/21/1999 |
| 5932388 | Carrier for developing electrostatic image, developer and developing method A carrier for a developer developing an electrostatic image is disclosed. The carrier contains magnesium from 2.0 to 25.0 by means of number of atoms by percent in surface portion. According to the invention excellent charge rising properties may be consi... | 08/03/1999 |
| 5888692 | Method for coating carrier particles for use in electrostatic developers A method for coating carrier particles for use in electrostatic developers is provided comprising the steps of: bringing the carrier particles to be coated in a vessel equipped with means for agitating the carrier particles, so that the carrier articles occupy... | 03/30/1999 |
| 5849452 | developing method using an oscillated electric field and including a specified toner and carrier A developing method for developing electrostatic latent images comprising: (a) forming a thin layer of a developer comprising a toner and a carrier on a developer transporting member having a magnet therein by contacting the developer with a developer regulati... | 12/15/1998 |
| 5845184 | Developing unit having improved toner density control A developing apparatus is provided for developing an electrostatic latent image on a latent image carrier by supplying the latent image carrier with a developer. This developing apparatus includes a toner accommodating chamber for accommodating magnetic t... | 12/01/1998 |
| 5845183 | Developing device for an image forming apparatus In an image forming apparatus, a developing device operable with toner or single component type developer has a hard first developing roller and a soft second developing roller. Fine magnetic N-S poles are formed on the periphery of the first roller. The ... | 12/01/1998 |
