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| Number | Title | Issue Date |
| 7238439 | 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... | 07/03/2007 |
| 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 |
| 5487954 | Non-acicular modified high coercivity iron oxides for high density magnetic recording and the processes of making the same The non-acicular modified maghemite and magnetite have high coercivity of, for the maghemite, up to 2200 Oe, saturation and residual magnetization of 63-85 emu/g and 43-52 emu/g, respectively; for the magnetite, the corresponding values are 800-1600 Oe, 8... | 01/30/1996 |
| 5487878 | Method for preparing perpendicularly magnetizable material usable on magnetic recording media A method for preparing a perpendicularly magnetizable material usable on magnetic recording media comprises the steps of: dissolving at least one member of the group consisting of strontium chloride and strontium nitrate with at least one member of the gr... | 01/30/1996 |
| 5112679 | Magnetic disk A magnetic disk comprising a non-magnetic support having provided thereon a magnetic layer comprising ferromagnetic particles, and a binder resin, wherein said magnetic layer is such that when sputtering is conducted on said magnetic layer from the surfac... | 05/12/1992 |
| 4859500 | Method for preparing a magnetic recording medium A method for preparing a magnetic recording medium comprising the steps of pre-dispersing ferromagnetic particles and a binder in a solvent, mixing and dispersing with an additional binder, and coating thus obtained magnetic coating composition on a suppo... | 08/22/1989 |
| 4837080 | Magnetic recording mediums for high density recording comprising an improved structure of a magnetic layer A magnetic recording medium which comprises a base film having a multitude of fine projections uniformly distributed over one surface thereof, and a magnetic layer formed on the base film. The magnetic layer is made of magnetic acicular particles extendin... | 06/06/1989 |
| 4778719 | Particulate magnetic recording media and method of manufacture thereof A magnetic recording medium is fabricated by the electrodeposition of acicular magnetic particles onto an electrically conductive substrate from a mixture that is continuously dispersed and circulated through the electrodeposition vessel. Electrodepositio... | 10/18/1988 |
| 4770951 | Magnetic flexible disks An improved flexible magnetic recording medium of the flexible disk type characterized by the use of effective quantities of magnetite to enhance the recording mediums, physical properties, conductivity and opacity. Superior magnetic recording performance... | 09/13/1988 |
| 4759954 | Magnetic recording medium and preparation 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 needle magnetic material, passing the coating through a magnet... | 07/26/1988 |
| 4693931 | Magnetic recording medium and magnetic particles therefor A magnetic recording medium comprising a nonmagnetic support and a magnetic layer provided thereon is disclosed. The magnetic layer comprises a magnetic recording element and a binder, wherein the magnetic recording element mainly comprises acicular gamma... | 09/15/1987 |
| 4677024 | Magnetic recording medium Magnetic recording medium comprising a magnetic layer formed by magnetic powder including acicular magnetic powder with the magnetic anisotropy to be oriented perpendicular to the acicular direction which is oriented in parallel with the magnetic layer.... | 06/30/1987 |
| 4672009 | Magnetic recording medium with vertically oriented magnetic particles A film type magnetic recording medium including a film substrate, and a magnetic film with a plurality of needle shaped magnetic grains dispersed in the magnetic film oriented to be substantially perpendicular to the surface of the magnetic film and verti... | 06/09/1987 |
| 4626463 | Diskette having wear-resistant magnetizable layer Magnetizable layer of a diskette, as in the prior art, comprises acicular magnetizable particles, alpha-Fe2 O3 particles, and head-cleaning agent particles dispersed in nonmagnetizable binder. The magnetizable layer of the novel disk... | 12/02/1986 |
| 4533582 | Stabilized magnetic recording materials and process for tailoring and stabilizing of magnetic recording materials A storage stable, pre-selected magnetic coercivity is imparted to a recording disk having a film of heat curable magnetic coating composition thereon by curing the composition in an anaerobic atmosphere at a high temperature, and then heating, typically i... | 08/06/1985 |
| 4500599 | Magnetic recording medium A magnetic recording medium comprising a nonmagnetic base having formed thereon a magnetic layer containing a fine particulate ferromagnetic material dispersed in a binder is disclosed. The ferromagnetic material is a mixture of two fine ferromagnetic pow... | 02/19/1985 |
| 4464279 | Magnetic recording medium Magnetic recording medium having a non-magnetic support carrying a magnetic layer, the layer comprising a ferromagnetic powder, a binder, and a Nitrogen containing compound, which is able to complex with Iron ions wherein the stability constant of the Nit... | 08/07/1984 |
| 4444835 | Magnetic recording medium A magnetic recording medium suitable for high-density recording, which comprises a magnetic layer containing uniaxial anisotropic, acicular iron oxide particles having a particle size of not more than 0.3μ, with a surface layer containing a major amount ... | 04/24/1984 |
| 4425409 | Method of preparing a magnetic pigment of γ-Fe2 O3 particles and recording element A method of manufacturing a magnetic pigment of γ-Fe2 O3 particles in which the process starts with an alkaline or acid reacting aqueous dispersion of γ-Fe2 O3. According to the invention, a water-soluble ammo... | 01/10/1984 |
| 4349385 | Method of preparing a FeOOH pigment The invention relates to a method of manufacturing an improved pigment of FeOOH particles. The starting material is an acidic or alkaline aqueous dispersion of FeOOH particles which has been manufactured according to known methods. According to the invent... | 09/14/1982 |
| 4255492 | Magnetic recording crystals, process for producing same, and magnetic recording webs using same A process for preparing acicular gamma ferric oxide (maghemite) crystals exhibiting excellent magnetic recording properties is disclosed. These acicular gamma ferric oxide crystals are new materials and can be used in magnetic media such as magnetic tapes... | 03/10/1981 |
| 4178416 | Acicular ferric oxide for magnetic recording and process for producing same Cobalt doped, acicular, gamma ferric oxide which exhibits reduced print-through without substantial loss in signal output or recording sensitivity is disclosed. This cobalt doped, acicular, gamma ferric oxide is prepared in the presence of a water soluble... | 12/11/1979 |
| 4002804 | Magnetic recording material A magnetic recording material which comprises a support having thereon a magnetic recording layer comprising a ferromagnetic substance and a binder, wherein the ferromagnetic substance comprises a mixture of (1) a Berthollide iron oxide having a particle ... | 01/11/1977 |
| 3953656 | Magnetic recording medium and preparation thereof The magnetic recording medium having a magnetic recording layer containing magnetic iron oxide having a cobalt content of 0.5 - 10 wt.% and a ratio of Fe2.sup.+ /Fe3.sup.+ of 0.1 - 0.35; wherein the half-value width of the differenti... | 04/27/1976 |
