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| Number | Title | Issue Date |
| 7407705 | Magnetic powder, a magnetic recording medium using the magnetic powder, and a method of surface treating a magnetic powder A magnetic powder composed primarily of Fe that has been surface-treated with a silane coupling agent, which magnetic powder is characterized in that it contains Co such that Co/Fe expressed in atomic percent is 20-50 at. %, Al such that Al/Fe expressed in atomic pe... | 08/05/2008 |
| 7405086 | Above room temperature ferromagnetic silicon A manganese-implanted silicon substrate exhibits ferromagnetism and a Curie temperature above room temperature when magnetized. The implant is done at a temperature of between about 250 C and about 800 C, while the manganese concentration is between about 0.01 atomi... | 07/29/2008 |
| 7402349 | Thick film composition yielding magnetic properties The invention is directed to a magnetic thick film composition comprising particles of permanent magnetic materials dispersed in organic medium wherein the medium comprises a polymer selected from polyurethane, phenoxy and mixtures thereof, and organic solvent. ... | 07/22/2008 |
| 7348079 | Magnetic recording medium A magnetic recording medium is provided that has on a non-magnetic support, in order, a radiation-cured layer formed by curing a layer containing a radiation curing compound by exposure to radiation, a lower layer having a non-magnetic powder and/or a magnetic powde... | 03/25/2008 |
| 7264893 | Magnetic recording medium The invention provides a magnetic recording medium comprising a support having provided thereon a nonmagnetic layer containing a nonmagnetic powder, and a magnetic layer containing a ferromagnetic powder formed on the nonmagnetic layer after coating and drying there... | 09/04/2007 |
| 7232480 | Modified carbon black carbon black dispersion liquid and water base ink There are provided a carbon black according to which long-term stable storage is possible, clogging is not prone to occurring, and the OD value is high and hence printing with a deep black color is possible, or a carbon black that can be used in a water-based ink th... | 06/19/2007 |
| 7220304 | Modified carbon black dispersion liquid and water base ink containing the same The present invention provides a water-based ink that is used in ink jet printer printing, with a writing instrument, or the like, that has a low settling rate and for which clogging is not prone to occurring, that can be stored stably for a long period without the ... | 05/22/2007 |
| 7208237 | Magnetic recording medium The present invention provides a magnetic recording medium comprising a thin film magnetic layer of thickness in a range from 0.03 to 0.30 μm, and having excellent surface smoothness and superior electromagnetic conversion characteristics. The magnetic recording me... | 04/24/2007 |
| 7166377 | Magnetic recording medium In one aspect, the magnetic recording medium comprises a nonmagnetic layer comprising a nonmagnetic powder and a binder and a magnetic layer comprising a ferromagnetic powder and a binder in this order on a nonmagnetic support. The quantity of metal ions comprised i... | 01/23/2007 |
| 7118816 | Magnetic recording medium The present invention provides a magnetic recording medium comprising a support and a magnetic layer comprising a CuAu type or Cu3Au type magnetically hard ordered alloy phase, wherein a center line average roughness of a magnetic layer surface is 0.1 to ... | 10/10/2006 |
| 7041397 | Magnetic recording medium A magnetic recording medium having on a nonmagnetic support at least one magnetic layer that contains a ferromagnetic metal powder and a binder and has surface roughness of 3 nm or below, with that the ferromagnetic metal powder has an average major-axis length of 3... | 05/09/2006 |
| 6692849 | Magnetic recording medium comprising spindle-shaped ferromagnetic metal particles A magnetic recording medium is provided comprising a non-magnetic support and at least one magnetic layer comprising ferromagnetic metal particles principally containing iron, having a spindle shape and having an average major axis length of 0.15 μm or l... | 02/17/2004 |
| 6682813 | Magnetic acicular alloy particles containing iron as a main component Magnetic acicular alloy particles containing iron as a main component according to the present invention, have an average major axial diameter of 0.05 to 0.2 μm, and pH values of water suspensions of said magnetic acicular alloy particles containing iron... | 01/27/2004 |
| 5534361 | Ferromagnetic metal powder There is provided a metallic magnetic powder with which one can produce magnetic media for high-density recording that are improved in storage stability and magnetic characteristics. The improved ferromagnetic metal powder contains no more than 0.05 wt % of ... | 07/09/1996 |
| 5527603 | Magnetic recording medium There is disclosed a magnetic recording medium comprising an uppermost layer (magnetic layer containing a ferromagnetic metal powder) and the ferromagnetic metal powder containing Fe, Al and one or more rare earth elements selected from the group consisti... | 06/18/1996 |
| 5256479 | Ferromagnetic ultrafine particles, method of making, and recording medium using the same Ultrafine particles of Fe--Co--P material with a Fe/Co atomic ratio of from 95/5 to 70/30 and a (Fe+Co)/P atomic ratio of from 85/15 to 60/40 show improved ferromagnetic properties. The average particle size is from 0.005 to 0.1 μm. Such ultrafine partic... | 10/26/1993 |
| 5252380 | Acicular alloy containing magnetic recording medium An acicular alloy base magnetic powder comprising iron and cobalt, which has an average particle long axis size of not larger than 0.25 μm, an axial ratio of from 4 to 8, a cobalt content of from 8 to 50% by weight based on the weight of iron and saturat... | 10/12/1993 |
| 5242752 | Magnetic recording medium comprising a specified binder resin, specified ferromagnetic metal powder and -alumina A magnetic recording medium having a support and provided thereon, a magnetic layer containing a ferromagnetic metal powder and a binder is disclosed. The ferromagnetic powder comprises an adsorbed moisture of not less than 1.0 weight % and not more than ... | 09/07/1993 |
| 5219670 | Magnetic recording medium A magnetic recording medium is disclosed, comprising a nonmagnetic support having provided on a first side of the support a magnetic layer containing a ferromagnetic powder and a binder, the ferromagnetic powder is a ferromagnetic metal powder having a wa... | 06/15/1993 |
| 5178925 | Magnetic disc having a magnetic layer with a glass transition temperature of at least 75° C. which contains magnetic metal powder of specified pH and surface area A magnetic disc having excellent running durability is disclosed, which comprises a non-magnetic support and a magnetic layer on the non-magnetic support, the layer being composed mainly of a ferromagnetic metal powder and a binder resin, wherein the ferr... | 01/12/1993 |
| 5051287 | Magnetic disk having a magnetic layer comprising a binder and ferromagnetic particles of specified crystallite size and surface area and in which the mechanical loss tangent, tan delta, is within a specified range A magnetic disk comprising a nonmagnetic support having provided thereon a magnetic layer comprising a ferromagnetic metal powder and a binder resin, wherein the magnetic layer has a mechanical loss tangent, tan δ, of from 8×10-3 to 6×10 | 09/24/1991 |
| 4806417 | Magnetic recording medium An improvement of a magnetic recording medium comprising a nonmagnetic support and a magnetic recording layer provided on the support which comprises a binder and a ferromagnetic powder dispersed therein is disclosed. The binder contains a resin component... | 02/21/1989 |
| 4788092 | Disc-shaped magnetic recording medium The present invention provides a disc-shaped magnetic recording medium particularly suitable for high density recording obtainable a high output power with low noise. In the disc-shaped magnetic recording medium according to the present invention, a ferro... | 11/29/1988 |
| 4654260 | Magnetic recording medium The present invention makes it possible that in a magnetic recording medium having a magnetic layer which contains therein ferromagnetic powder and serving as a magnetic recording medium for short wavelength recording in, for example, a video tape recorde... | 03/31/1987 |
| 4617234 | Magnetic recording medium An improved magnetic recording medium comprising a magnetic layer formed by applying a ferromagnetic metal powder together with a binder to a non-magnetic base is described. The improvement is that the ferromagnetic metal powder has a saturation magnetism... | 10/14/1986 |
| 4572866 | 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 ferromagnetic metallic powder. The average grain size of said ferromagnetic powder is not more than 0.5μ, th... | 02/25/1986 |
| 4537833 | Magnetic recording medium A magnetic recording medium which comprises a non-magnetic support having thereon a magnetic recording layer containing ferromagnetic metal particles and a binder, wherein the ferromagnetic metal particles have a specfic area of about 35 to about 80 m | 08/27/1985 |
| 4481253 | Process for preparing ferromagnetic metal powder and a magnetic recording medium including the powder A process for preparing a ferromagnetic metal powder and a magnetic recording medium utilizing that powder are disclosed. The ferromagnetic metal powder is prepared by heat-treating an acicular iron oxyhydroxide or an acicular iron oxide powder prepared f... | 11/06/1984 |
| 4480004 | Magnetic recording medium A magnetic recording medium suitable for high-density recording which comprises a substrate and a magnetic layer thereon, the magnetic layer containing acicular magnetic metal particles having a particle size of not more than 0.3μ and a squareness ratio ... | 10/30/1984 |
| 4455345 | Magnetic recording medium A magnetic recording medium is disclosed. The medium is comprised of a support having a magnetic layer coated thereon. The magnetic layer is comprised of ferromagnetic metal powder and a binder. The ferromagnetic metal powder has a specific surface area o... | 06/19/1984 |
| 4396668 | Magnetic recording medium A magnetic recording medium obtained by coating a magnetic metallic powder with a binder on a non-magnetic substrate, wherein said magnetic metallic powder is mainly made of acicular particles obtained by a dry reduction process and said magnetic recordin... | 08/02/1983 |
| 4347291 | Magnetic recording medium and preparation thereof A magnetic recording medium is produced by forming an alkaline aqueous slurry of an acicular hydrated iron oxide or an acicular iron oxide as a starting material; adding a water soluble silicate to said slurry; treating it by a hydrothermal reaction in a ... | 08/31/1982 |
| 4318961 | Magnetic recording medium A master magnetic recording medium comprises a polymer film substrate coated with a magnetic layer comprising a binder, a metallic magnetic powder A obtained by a wet reduction and a metallic magnetic powder B obtained by a dry reduction wherein both said... | 03/09/1982 |
| 4309471 | Magnetic audio-recording tape A magnetic audio-recording tapes based on finely-divided ferromagnetic alloy materials are disclosed which have improved surface characteristics. The improvement of recording and playback characteristics is specifically exhibited in a reduction in modulat... | 01/05/1982 |
| 4299888 | Method for forming in situ magnetic media in the form of discrete particles and article A method of forming discrete magnetic particles in situ by dispersing a nickel hypophosphite solution in a binder and binder solvent, such as polyvinyl alcohol in water or polyester urethane polymer in an organic solvent, forming a coating from the nickel... | 11/10/1981 |
| 4197347 | High density magnetic recording media A magnetic recording medium comprising a nonmagnetic support having thereon a magnetic recording layer of a ferromagnetic powder dispersed in a binder, wherein the ferromagnetic powder is a low vacuum evaporation process ferromagnetic metal powder subject... | 04/08/1980 |
| 4167582 | Magnetic metallic powder containing iron and magnetic recording medium using same powder A magnetic metallic powder which is essentially of iron or its alloy with at least one other metal and features a good resistance to oxidation by air as well as a large value for saturation magnetization is obtained by the reduction of an oxide powder pre... | 09/11/1979 |
| 4020236 | Process for producing a magnetic material and magnetic recording medium containing the same A ferromagnetic material having a high coercive force and good squareness ratio prepared by mixing an aqueous solution at least containing a salt of a metal capable of forming a ferromagnetic material with a solution of a reducing agent containing at leas... | 04/26/1977 |
