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| Number | Title | Issue Date |
| 7381482 | Hexagonal ferrite magnetic powder, method for producing the same and magnetic recording medium A hexagonal ferrite magnetic powder having an average tabular diameter of from 15 to 28 nm, a coercive force (Hc) of from 2,000 to 5,000 Oe (from 160 to 400 kA/m), a switching field distribution (SFD) of from 0.3 to 0.7 and a D70/D50 of from 1.05 to 1.... | 06/03/2008 |
| 7283320 | Magnetic recording medium including servo and data bands in the magnetic layer A magnetic recording medium having a magnetic layer containing magnetic powder provided on a support is disclosed. The magnetic layer possesses a servo band in which a servo signal for controlling tracking of a magnetic head, and a data band on which a data is recor... | 10/16/2007 |
| 7257880 | Method for assembling an actuator head suspension Embodiments of the invention provide a method for easily and reliably neutralizing charge in an assembly process for an actuator head suspension assembly used in a magnetic disk device. In one embodiment, a head suspension assembly includes a wire trace that include... | 08/21/2007 |
| 7180699 | Method and apparatus for increasing capacity of magnetic media storage A method and apparatus for increasing the capacity of magnetic media storage is disclosed. More specifically, an improved two-sided magnetic tape is disclosed. In one implementation, in order to mitigate pack winding problems, a trade-off can be made between the bac... | 02/20/2007 |
| 7175927 | Magnetic recording medium utilizing specified non-magnetic particles in the magnetic layer A magnetic recording medium having a non-magnetic support and a magnetic layer formed thereon, wherein the magnetic layer comprises a ferromagnetic powder, a binder and a non-magnetic inorganic powder, and wherein at least 95% of the non-magnetic powder particles co... | 02/13/2007 |
| 7144643 | Magnetic recording medium The invention provides a high performance magnetic recording medium used in the magnetic recording system using the MR head for the regeneration head, wherein the magnetic recording medium does not damage the MR head by direct sliding contact while having durability... | 12/05/2006 |
| 7144642 | Permanent magnet and method for preparation thereof A ferrite magnet obtained by adding a ferrite having a hexagonal W-type magnetoplumbite structure to a ferrite having a hexagonal M-type magnetoplumbite structure, in which a portion of Sr, Ba, Pb or Ca is replaced with at least one element that is selected from the... | 12/05/2006 |
| 7132164 | Hexagonal ferrite magnetic powder, method for producing the same and magnetic recording medium A hexagonal ferrite magnetic powder having an average tabular diameter of from 15 to 30 nm, a coercive force (Hc) of from 2,000 to 5,000 Oe (from 160 to 400 kA/m) and a saturated magnetization (σs) of equal to or more than the average tabular diameter (nm)×0.37+45... | 11/07/2006 |
| 7128989 | Magnetic recording medium Provided is a magnetic recording medium having excellent dispersibility, smoothness and electromagnetic characteristics. The magnetic recording medium comprises at least one magnetic layer comprising a ferromagnetic powder and a binder on a nonmagnetic support. Said... | 10/31/2006 |
| 7025946 | Method for producing soft magnetic hexagonal ferrite sintered material and soft magnetic hexagonal ferrite sintered material A soft hexagonal ferrite sintered material includes crystal particles of M-type hexagonal ferrite corresponding to a general chemical formula MFe12O19 wherein M is at least one element selected from the group consisting of Ba, Sr and Pb. Crysta... | 04/11/2006 |
| 6994925 | Magnetic recording medium To provide a magnetic recording medium which undergoes little effect of thermal fluctuation and provides a high short wavelength output and C/N ratio when reproduction is conducted using MR head, the magnetic recording medium includes a non-magnetic layer having a n... | 02/07/2006 |
| 6703101 | Magnetic recording medium A magnetic recording medium for reproduction of MR head comprising a support having thereon a substantially non-magnetic low layer and a magnetic layer comprising ferromagnetic hexagonal system ferrite particles dispersed in a binder, in this order, where... | 03/09/2004 |
| 6677036 | Method for producing magnetic recording medium and magnetic recording medium A method for producing a magnetic recording medium comprising: dispersing at least a binder and a ferromagnetic hexagonal ferrite powder to prepare a magnetic coating; and applying the magnetic coating to provide at least one magnetic layer, wherein the b... | 01/13/2004 |
| 6663955 | Magnetic recording medium A magnetic recording medium is disclosed, comprising a support having thereon a magnetic layer which mainly comprises a ferromagnetic powder and a binder, wherein the magnetic recording medium is used in a magnetic recording reproduction system in which a... | 12/16/2003 |
| 6645648 | Magnetic recording medium comprising a backcoat layer having specific protrusions Provided is a magnetic recording medium having good electromagnetic characteristics, particularly both improved high-density recording characteristics and good durability, and particularly a C/N ratio that is markedly improved in the high-density recordin... | 11/11/2003 |
| 6638648 | Perpendicular magnetic recording medium and magnetic storage apparatus using the same A large-capacity magnetic storage apparatus is disclosed, capable of performing ultra-high density magnetic recording of 50 gigabits or more per 1 square inch. In a perpendicular magnetic recording medium having a non-magnetic intermediate layer and a mag... | 10/28/2003 |
| 6623849 | Magnetic recording medium A magnetic recording medium comprises: a support; an underlayer containing a non-magnetic powder and a binder; and at least one magnetic layer containing a binder and one of a ferromagnetic metal powder having an average major axis of 0.01 μm to 0.10 μm... | 09/23/2003 |
| 6620499 | Magnetic recording medium A magnetic recording medium having on a support a non-magnetic layer comprising a non-magnetic powder dispersed in a binder resin and on the non-magnetic layer a magnetic layer comprising a ferromagnetic powder dispersed in a binder resin, wherein the fer... | 09/16/2003 |
| 5525404 | Tape-shaped magnetic medium comprising hexagonal ferrite particles having a crystal structure which includes magnetoplumbite and spinel crystal structures Tape-shaped magnetic medium has a magnetic layer composed of compound powders of hexagonal and spinel ferrites and is designed so that the magnetic layer and the nonmagnetic base film, that is either a PEN film or an aromatic polyamide film, have specifie... | 06/11/1996 |
| 5496653 | Magnetic recording medium with longitudinal glossiness 200% or more A magnetic recording medium having good characteristics over all recording wavelength regions, comprising a non-magnetic support having thereon a magnetic layer mainly comprising a tabular ferromagnetic hexagonal ferrite particle and a binder, wherein sai... | 03/05/1996 |
| 5494749 | Magnetic powder for magnetic recording and magnetic recording medium containing the same A magnetic powder for magnetic recording is disclosed which comprises composite magnetic particles (A), each of which contains hexagonal ferrite and spinel structure ferrite, and single phase magnetic particles of hexagonal ferrite (B). When the mixing ra... | 02/27/1996 |
| 5229219 | Magnetic recording medium comprising a magnetic layer containing a specified magnetic ferrite powder and having a curie temperature up to 180° C. According to the invention, a magnetic recording medium is formed by using magnetic powder having a composition of the following formula: MeO.multidot.n[Fe2-x-y-z Gax Cry Alz O3 ] wherein Me is at least on elem... | 07/20/1993 |
| 5227283 | Silver halide photographic material A silver halide photographic material is disclosed comprising a support having provided thereon at least one light-sensitive silver halide emulsion and at least one transparent magnetic recording layer, wherein the magnetic recording layer contains a bind... | 07/13/1993 |
| 5217820 | High density slave magnetic recording media having specified perpendicular squareness rectangular ratio, roughness and number of projections The high density slave magnetic recording media comprising on a non-magnetic substrate a magnetic recording layer coated with magnetic hexagonal ferrite powder along with a binder component to transfer the digital signals stored on the master magnetic rec... | 06/08/1993 |
| 5135733 | Process for preparing hexaferrite particles The present invention concerns a process for preparing magnetic particles of barium or strontium hexaferrites exhibiting a good dispersibility and improved magnetic properties. The process involves coprecipitating an iron salt with a barium or strontium s... | 08/04/1992 |
| 5114801 | Magnetic recording medium having a magnetic layer comprising hexagonal barium ferrite magnetic particles containing tin and magnesium in specified proportions Disclosed herein is a magnetic recording medium having a magnetic layer comprising hexagonal ferrite magnetic particles each expressed as BaO.multidot.Fe12-x-y Snx Mgy O18 (where, 0.55ࣘxࣘ0.88, 0.71ࣘyࣘ1.0... | 05/19/1992 |
| 5104750 | Magnetic recording medium In the magnetic recording medium according to the present invention comprising a magnetic recording medium layer where a magnetic paint containing Ba ferrite magnetic powder is coated on the substrate, Hc in the oriented direction ranging from 900 to 1500... | 04/14/1992 |
| 5079092 | Plate-like composite ferrite fine particles suitable for use in magnetic recording and process for producing the same Disclosed herein are plate-like composite ferrite fine particles for magnetic recording comprising plate-like composite ferrite containing Ba fine particles which contain Ti of 2 to 5.0 atomic % based on Fe3+ and Ni in the range of 1.2ࣘNi/Tià... | 01/07/1992 |
| 5077146 | Magnetic recording medium containing a substituted hexagonal ferrite magnetic powder which includes Zr or Hf and which has a temperature coefficient of coercivity not more than 3.5 oersteds/°C. Disclosed is a magnetic powder for high-density magnetic recording, formed of a substituted hexagonal ferrite possessing an average particle diameter in the range of 0.01 to 0.2 μm and a coercivity in the range of 200 to 2,000 Oe and characterized by the... | 12/31/1991 |
| 5075169 | Plate-like composite ferrite particles for magnetic recording and process for producing the same Disclosed herein are plate-like composite ferrite particles for magnetic recording comprising plate-like composite ferrite containing Ba particles having a composition represented by 19 | 12/24/1991 |
| 5062983 | Magnetic powder for magnetic recording media A magnetic powder for magnetic recording media, which has an average particle diameter of at most 0.08 μm and a ratio of the maximum diameter to the maximum thickness of at most 8 and is represented by the following general composition formula: (Fe)... | 11/05/1991 |
| 5062982 | Magnetic powder for magnetic recording media A magnetic powder for magnetic recording media, which has an average particle diameter of at most 0.1 μm and is represented by the following general composition formula: (Fe)a (Zr)b (Si)c (M1)d (M2 | 11/05/1991 |
| 5047290 | Magnetic recording medium A magnetic recording medium which comprises a substrate and a magnetic layer comprising a hexagonal system barium ferrite powder of the formula: BaO.n[Fe2-(a+b+c+d) Coa Nib Znc Tid O3+e ](I) wherein ... | 09/10/1991 |
| 4851292 | Plate-like barium ferrite particles suitable for use in magnetic recording and process for producing the same Disclosed herein are plate-like barium ferrite particles with a solid solution of zinc on the surface thereof, which have an average particle diameter of not less than 0.03 μm and less than 0.1 μm, a BET specific surface are of 55 to 80 m2 /g... | 07/25/1989 |
| 4837092 | Magnetic recording powder, method of manufacturing thereof and application thereof A magnetic recording powder comprising a hexagonal barium ferrite substituted with a coercive force control element. This magnetic powder is preliminarily treated with sulfate ion-containing water so as to convert any free barium ions in the magnetic powd... | 06/06/1989 |
| 4828916 | Plate-like magnetoplumbite type ferrite particles for magnetic recording and magnetic recording media using the same Disclosed herein are Ba-containing plate like magnetoplumbite type ferrite particles for magnetic recording having the composition of AO.n{(Fe1-X MX)2 O3 } (wherein A represents Ba or Ba and Sr, M represents Zn ... | 05/09/1989 |
| 4822634 | Longitudinal magnetic coated recording medium A longitudinal magnetic coated recording medium includes at least planar magnetic particles, each having an easy magnetization axis perpendicular to the planar surface thereof, preferably mixed with other particles, and dispersed in a magnetic film formed... | 04/18/1989 |
| 4810555 | Magnetic recording medium In a magnetic recording medium comprising a substrate and a magnetic layer thereon, the magnetic layer is formed by coating a composition of a binder, preferably radiation-curable binder and a plate magnetic material such as hexagonal plate barium or stro... | 03/07/1989 |
| 4806429 | Plate-like barium ferrite particles suitable for use in magnetic recording and process for producing the same Disclosed herein are plate-like barium ferrite particles with a solid solution of zinc on the surface thereof, which have an average particle diameter of 0.05 to 0.3 μm, a coercive force of 300 to 1,500 Oe and a magnetization of not less than 55 emu/g in... | 02/21/1989 |
| 4792483 | Magnetic recording medium A magnetic recording medium with improved durability is provided and comprises a substrate and a magnetic layer formed thereon which contains hexagonal system ferrite magnetic powder in a volume percentage of not larger than 35% per whole volume of the ma... | 12/20/1988 |
