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| Number | Title | Issue Date |
| 7700204 | Magnetic recording medium containing particles with a core containing a FENphase A magnetic recording medium comprising a nonmagnetic support and a magnetic layer formed on the support and containing a magnetic powder and a binder, wherein said magnetic powder comprises substantially spherical or ellipsoidal particles and at least one element se... | 04/20/2010 |
| 7344779 | Magnetic powder A fine magnetic powder suitable for magnetic tape capable of high-density magnetic recording is provided that helps to prevent degradation of tape surface property and durability with increasing fineness of the magnetic powder particles, which magnetic powder consis... | 03/18/2008 |
| 7297423 | Printed circuit board A PCB that can transmit a high frequency signal of a GHz band with a low loss includes an insulator and magnetic nanoparticles dispersed in the insulator. ... | 11/20/2007 |
| 7291409 | Magnetic recording medium using magnetic powder having a core portion and an outer layer portion including a rare earth element and magnetic recording cassette A magnetic recording medium comprising a non-magnetic support, at least one primer layer formed on one surface of the non-magnetic support, comprising a non-magnetic powder and a binder resin, at least one magnetic layer formed on the primer layer, comprising a magn... | 11/06/2007 |
| 7288241 | Black composite oxide particle and method for production thereof A black composite oxide particle includes a composite oxide having Fe, Mg and Al as metal components. The particle contains Fe, Mg and Al in amounts of 30 to 55 mass %, 1 to 10 mass %, and 1 to 10 mass %, respectively, and has an atomic ratio of Fe3+/Fe | 10/30/2007 |
| 7267896 | Magnetic tape and magnetic tape cartridge A magnetic recording medium comprising a non-magnetic support; at least one lower magnetic layer containing magnetic powder and a binder resin, which is formed on one side of the non-magnetic support with or without a non-magnetic primer layer interposed between the... | 09/11/2007 |
| 7235127 | Reduction- and oxidation-stable iron oxide black pigments having high colour strength for colouring plastics and building materials, their preparation and their use The present invention relates to reduction- and oxidation-stable iron oxide black pigments having high color strength, the preparation thereof and the use thereof. ... | 06/26/2007 |
| 5514465 | Magnetic recording medium comprising a magnetic layer containing magnetic powder, an organic dye and a binder having an amino group or ammonium salt group A magnetic layer containing a magnetic powder whose surface is composed mainly of carbon and/or iron carbide and a binder is provided on a non-magnetic substrate, the magnetic layer further contains an organic dye compound having at least one polar group ... | 05/07/1996 |
| 5217804 | Magnetic particles Magnetic particles are cobalt surface treated gamma iron oxide (Fe2 O3) having a specific area of at least 30 m2 /g and a powder coercivity greater than about 450 Oe, the particles being coated with from about 10 to about ... | 06/08/1993 |
| 5120604 | Acicular magnetic iron oxide particles and magnetic recording media using such particles Disclosed herein are acicular magnetic iron oxide particles coated with double coating layers consisting of a Co compound layer as a lower layer and a spinel-type ferrite layer containing Mn-Zn, Ni-Zn or Mn-Ni-Zn as an upper layer, a process for producing... | 06/09/1992 |
| 5110658 | Magnetic recording medium A magnetic recording medium having a non-magnetic support and provided thereon a magnetic layer containing a ferromagnetic ion oxide and a binder, said ferromagnetic iron oxide containing Si and/or Al at a proportion of 0.10 to 0.25% by weight and methods... | 05/05/1992 |
| 5102732 | Magnetic recording medium A magnetic recording medium is disclosed which comprises a non-magnetic support and a magnetic layer comprising ferromagnetic powder, provided on the support. The magnetic layer contains silicon and aluminum, wherein the silicon content of ferromagnetic p... | 04/07/1992 |
| 4863795 | Magnetic recording medium A magnetic recording medium comprises a base film and a magnetic film having magnetic particles, formed on the base film. The magnetic film has a coercive force ranging from 750 Oe to 980 Oe and a residual magnetic flux density of 1,250 Gauss or over. In ... | 09/05/1989 |
| 4857417 | Cobalt-containing iron oxide magnetic particles and method for the preparation of the same Cobalt-containing iron oxide magnetic particles having a high coercive force and a small surface electrical resistance which are useful as a recording element for a magnetic recording medium, and a method for the preparation of the same comprising reducin... | 08/15/1989 |
| 4803132 | Magnetic recording medium A magnetic recording medium with high output power and improved durability which comprises a nonmagnetic substrate and a magnetic layer formed thereon containing magnetic powder and a binder, wherein the magnetic powder comprises a nuclear crystal consist... | 02/07/1989 |
| 4789591 | Magnetic recording medium A magnetic recording medium comprising a support and a magnetic layer on said support. Said magnetic layer is a unitary magnetic layer comprising iron oxide powder having cobalt adsorbed on the surface thereof. The average grain size of said powder is not... | 12/06/1988 |
| 4686142 | Process for the production of iron oxides epitaxially coated with cobalt the coated oxides and their cue In improved cobalt coated magnetic iron oxide having increased coercive field strength and highly efficient for use in magnetic recording devices and processes is produced by subjecting uncoated magnetic iron oxide particles to an acid treatment and then ... | 08/11/1987 |
| 4683167 | Magnetic iron oxide pigment and recording media An improved magnetic particulate pigment suitable for use in recording media and media employing it are disclosed. The particles of the pigment comprise a magnetic core with an epitaxial layer containing approximately 0.05-2.0% of the total pigment as zin... | 07/28/1987 |
| 4657816 | Ferromagnetic recording materials Low performance ferromagnetic oxides are taught to be convertible into high performance ferromagnetic oxides with vastly improved coercivity by suspending ferromagnetic oxide particles in aqueous media, forming a layer of the first metal on the surfaces o... | 04/14/1987 |
| 4631140 | Ferrimagnetic particles and their preparation Ferrimagnetic particles which are useful as magnetic material for magnetic recording media and consist of a core of a magnetic material exhibiting multiaxial anisotropy and a coating which surrounds the core and is composed of a magnetic material possessi... | 12/23/1986 |
| 4621018 | Magnetic recording medium A magnetic recording medium comprising a transparent support and a magnetic layer formed on the support, said magnetic layer comprising Co-adsorbed Fe3 O4 and Co-adsorbed γ-Fe2 O3 in a weight ratio of from 40:6... | 11/04/1986 |
| 4473619 | Magnetic audio recording tape and method of preparation thereof An audio magnetic recording medium includes a magnetic material carrier backing and a layer of a magnetic material thereover comprising magnetic particles dispersed in a binder, the magnetic particles having a thin coating thereon of a rare earth-containi... | 09/25/1984 |
| 4465735 | Magnetic recording medium An improved magnetic recording medium suitable for high density recording is disclosed, which has a squareness ratio in the vertical direction of 0.6 or more and an orientation ratio (squareness ratio in the vertical direction/squareness ratio in the leng... | 08/14/1984 |
| 4457982 | Acicular ferrimagnetic iron oxide and its preparation A modified acicular ferrimagnetic iron oxide which consists of a core of gamma-iron(III) oxide and a surrounding shell of gamma-iron(III) oxide modified by tin dioxide and carbon, and a process for its preparation.... | 07/03/1984 |
| 4451535 | Magnetic recording elements, process for making the same and their use in recording Magnetic recording elements having at least one magnetic recording layer containing acicular magnetic particles that have magnetocrystalline anisotropy, shape anisotropy which provides a preferred axis of magnetization and a coercivities of at least 450 O... | 05/29/1984 |
| 4423114 | Magnetic powder for magnetic recording medium A magnetic powder for a magnetic recording medium which is a cobalt-adsorbed magnetic iron oxide having a coercive force of 1000 Oe or more and a ratio of a coercive force at -196° C. to a coercive force at room temperature of 3 or less.... | 12/27/1983 |
| 4400432 | Coating iron oxide particles for magnetic recording In the preparation of highly orientatable needle-shaped ferrimagnetic iron oxide particles by the reduction and reoxidation of needle-shaped particles of hydrated oxide of iron which have been surface treated against sintering the improvement which compri... | 08/23/1983 |
| 4364988 | Magnetic recording medium An improved magnetic recording medium is disclosed, particularly a magnetic tape suitable for sound recording and video recording, which comprises as a recording element a mixture of cobalt-containing iron oxide magnetic particles consisting essentially o... | 12/21/1982 |
| 4323596 | Coating iron oxide particles for magnetic recording In the preparation of highly orientatable needle-shaped ferrimagnetic iron oxide particles by the reduction and reoxidation of needle-shaped particles of hydrated oxide of iron which have been surface treated against sintering the improvement which compri... | 04/06/1982 |
| 4321302 | Process for producing magnetic powder having high coercive force A magnetic iron oxide powder having high coercive force is produced by dispersing a magnetic iron oxide comprising a silicon component and a phosphorus component in an aqueous solution of a cobalt ion and adding a base to the dispersion to be an alkaline ... | 03/23/1982 |
| 4321303 | Magnetic powder for magnetic recording medium A magnetic powder for a magnetic recording medium is obtained by forming a silica layer on a surface of an acicular iron oxide fine powder as a core by treating it with a silicon compound before preparing a cobalt modified acicular iron oxide fine powder ... | 03/23/1982 |
| 4302510 | Magnetic recording medium A magnetic recording medium having more than 550 Oersted of a coercive force, less than 1.8 of a ratio of a coercive force at -196° C. to a coercive force at 25° C., less than 1.0 wt. % of a content of Fe2+ is prepared by incorporating a magn... | 11/24/1981 |
| 4276183 | Cobalt modified magnetic iron oxide Magnetic material comprising magnetic iron oxide modified with at least about 0.5 weight % cobalt, based on the weight of total product which when combined with a binder at a 75% by weight loading forms a magnetic recording member having an orientation ra... | 06/30/1981 |
| 4226909 | Cobalt-doped acicular hyper-magnetite particles Acicular hyper-magnetite particles, that is, acicular particles of where x is greater than one and not greater than 1.5, are provided with coatings of a cobalt compound, the cobalt providing 1% to 10% of the total weight of the particles. The particles provide... | 10/07/1980 |
| 4137342 | Cobalt-doped acicular hyper-magnetite particles Acicular hyper-magnetite particles, that is, acicular particles of where x is greater than one and not greater than 1.5, are provided with coatings of a cobalt compound, the cobalt providing 1% to 10% of the total weight of the particles. The particles provide... | 01/30/1979 |
| 4112184 | Magnetic recording medium and method of preparing A magnetic recording medium is prepared by depositing magnetic particles of ferromagnetic, acicular iron oxide upon whose surface is adsorbed cobalt hydroxide, on a supporting substrate.... | 09/05/1978 |
