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| Number | Title | Issue Date |
| 7901805 | Magnetic recording medium and method of producing the same A magnetic recording medium, which comprises: a nonmagnetic support; and a magnetic layer comprising a ferromagnetic powder and a binder, wherein an average surface roughness (Ra) at a center of a surface of the magnetic layer measured by using an atomic force micro... | 03/08/2011 |
| 7378679 | Patterned substrate, electro-optical device, and method for manufacturing an electro-optical device A patterned substrate includes a laminated pattern having laminated patterns that are formed by drying droplets containing a pattern formation material. A lower layer pattern contains lyophilic microparticles that are lyophilic with respect to droplets that form an ... | 05/27/2008 |
| 7368188 | Magnetic recording medium A magnetic recording medium including a polymer support having thereon at least one magnetic layer containing a ferromagnetic metal powder having an average major axis length of from 20 to 100 nm or a ferromagnetic hexagonal ferrite powder having an average tabular ... | 05/06/2008 |
| 7357980 | Nonmagnetic powder comprising acicular iron and having specific porosity for a magnetic recording medium, method of manufacturing same, and magnetic recording medium using same A nonmagnetic powder, used for the nonmagnetic layer of a coated type magnetic recording medium having a multilayer structure, has good dispersibility in the binder in which it is dispersed to prepare a coating material that is applied to the nonmagnetic layer. The ... | 04/15/2008 |
| 7186472 | Magnetic recording medium A magnetic recording medium comprising a support and a magnetic layer containing an abrasive, a binder and ferromagnetic powder dispersed in the binder, wherein the magnetic layer has a thickness of from 20 to 500 nm, the abrasive has a Mohs' hardness of 5 or more a... | 03/06/2007 |
| 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 |
| 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 |
| 7041396 | Magnetic recording medium Provided is a magnetic recording medium affording good head contact and high output in addition to excellent head abrasion characteristics acceptable to high data transmission rates. The magnetic recording medium comprises a nonmagnetic layer comprising a nonmagneti... | 05/09/2006 |
| 6979501 | Magnetic recording medium having a smooth biaxially tensilized film substrate A magnetic recording medium which includes a non-magnetic substrate having a front side and a backside, a longitudinal direction and a crossweb direction, with a particulate/binder magnetic layer formed over the front side of the substrate, wherein the magnetic medi... | 12/27/2005 |
| 6652953 | Magnetic recording medium A magnetic recording medium includes a support, and a single magnetic layer having a thickness of 0.3 μm or less, which contains nonmagnetic particles. In the magnetic medium, the thickness of the single magnetic layer is equal to or larger than an avera... | 11/25/2003 |
| 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 |
| 6610415 | Magnetic or magnetizable composite product and a method for making and using same Thin, flexible composite materials, which are magnetic or magnetizable and processes for producing and using the materials. The composite material contains a laminate formed from a mixture of magnetic or magnetizable particles, binder particles (and optio... | 08/26/2003 |
| 5508117 | Magnetic recording medium and production process thereof Disclosed is a magnetic recording medium comprising a nonmagnetic support having thereon a magnetic layer comprising a ferromagnetic powder and a binder resin as the main components together with abrasive particles. The ferromagnetic powder is a hexagonal... | 04/16/1996 |
| 5110659 | Lapping tape A lapping tape has an abrasive coat which comprises an acicular iron oxide powder having a surface area of at least 30 m2 /g as determined by the BET method and a granular inorganic powder having a Moh's hardness of more than 7 and contained in... | 05/05/1992 |
| 4818608 | Magnetic recording medium A magnetic recording medium comprising a non-magnetic substrate and a magnetic layer which is formed on the substrate and comprises a magnetic powder and an abrasive material consisting of -alumina particles as a first component and at least one se... | 04/04/1989 |
| 4759979 | Magnetic recording medium A magnetic recording medium is disclosed which comprises a non-magnetic support having coated thereon a magnetic layer containing a specific amount of a specific acicular Cr2 O3 along with alpha-Al2 O3, SiC, and... | 07/26/1988 |
| 4756960 | Abrasive tape An abrasive tape comprises a flexible non-magnetic substrate, and an abrasive coating film essentially consisting of an abrasive material, a binder and an additive kneaded together and applied onto the flexible non-magnetic substrate. The abrasive materia... | 07/12/1988 |
| 4752524 | Abrasive tape An abrasive tape comprises a flexible non-magnetic substrate, and an abrasive coating film applied onto the flexible non-magnetic substrate and formed by kneading an abrasive material and a binder essentially consisting of a vinyl chloride-vinyl acetate-m... | 06/21/1988 |
| 4743500 | Magnetic recording medium A magnetic recording medium comprising a nonmagnetic support and a magnetic recording layer provided on said support, said magnetic recording layer comprising a ferromagnetic metal powder having a specific surface area of not less than 45 m2 /g... | 05/10/1988 |
| 4741952 | Magnetic recording medium A magnetic recording medium comprising a substrate material and a magnetic layer provided thereon, said magnetic layer containing magnetic particles and a resinous binder, characterized in that the magnetic layer further comprises non-magnetic particles o... | 05/03/1988 |
| 4740418 | Magnetic recording medium A magnetic recording medium comprising a nonmagnetic support and a magnetic recording layer provided on said support, said magnetic recording layer comprising a ferromagnetic powder dispersed in a binder, characterized in that said magnetic recording laye... | 04/26/1988 |
| 4721646 | Magnetic recording medium A magnetic recording medium of the present invention comprises: a substrate; a magnetic film formed on this substrate; and a nonmagnetic reinforcing agent mixed into the magnetic film and projected from the surface of the magnetic film. Assuming that the ... | 01/26/1988 |
| 4687703 | Magnetic recording medium A magnetic recording medium is described, comprising a non-magnetic support having coated thereon a magnetic layer, the magnetic layer containing (i) ferromagnetic alloy particles having a specific surface area (SBET) of 48 m2 /g or ... | 08/18/1987 |
| 4687704 | Magnetic recording medium A magnetic recording medium such as a video tape comprising a magnetic recording layer which comprises a ferromagnetic metal powder having a specific surface area of not less than 42 m2 /g and an inorganic material powder having a Mohs' scale o... | 08/18/1987 |
| 4668568 | Magnetic recording medium This invention provide a magnetic recording medium with well-balanced excellent properties as to video head abrasion, still life, video S/N and drop out, which comprises a non-magnetic support and a magnetic recording layer containing a ferromagnetic powd... | 05/26/1987 |
| 4618536 | Magnetic recording medium A magnetic recording medium having a high durability with good electro-magnetic properties, which comprises a base material and a magnetic layer provided thereon, the magnetic layer containing magnetic particles and a binder, characterized in that the mag... | 10/21/1986 |
| 4571362 | Magnetic recording medium A magnetic recording medium contains, in the coating layer of a magnetic powder, 0.5-15% by weight of at least either nonmagnetic powder of Al2 O3 or Cr2 O3 and 0.5-15% by weight of -Fe2 O... | 02/18/1986 |
| 4568619 | Nonmagnetic particles to improve properties of magnetic recording compositions Ferromagnetic recording elements with improved physical properties have from 20 to 50% of the volume of ferromagnetic particles replaced by nonmagnetic particles of a size smaller than the thickness of the magnetic layer.... | 02/04/1986 |
| 4474848 | Magnetic recording medium This invention relates to an improved magnetic recording medium having an increased durability as well as a decreased head abrasion, which comprises a magnetic recording layer on the surface of a non-magnetic support, the magnetic recording layer containi... | 10/02/1984 |
| 4448842 | Magnetic recording medium A magnetic recording medium having a magnetic layer formed on a non-magnetic base is disclosed. The magnetic layer comprises (1) magnetic particles, (2) an abrasive having a Mohs hardness of 6 or more, (3) calcium carbonate, (4) an aliphatic acid and (5) ... | 05/15/1984 |
| 4425400 | Magnetic recording medium In a magnetic recording medium comprising a magnetic recording layer on the surface of a non-magnetic support member, an abrasive having a Mohs' hardness of at least 6 and needle-shaped -Fe2 O3 are incorporated in the magnetic... | 01/10/1984 |
| 4423452 | Magnetic recording medium A magnetic recording medium comprises a substrate coated with a magnetic layer comprising a magnetic powder and a fine titanium oxide powder having a particle diameter of at least 0.4μ and at least one other fine hard non-magnetic powder.... | 12/27/1983 |
| 4420408 | Magnetic recording medium A magnetic recording medium comprises a combination of two or more kinds of fine abrasive powders having different true specific gravities in a magnetic layer containing a magnetic powder.... | 12/13/1983 |
| 4420532 | Magnetic recording medium In a magnetic recording medium comprising a magnetic recording layer on the surface of a non-magnetic support member, a ferromagnetic powder, an abrasive having a Mohs' hardness of at least 6, colloidal silica and a fatty acid and fatty acid ester are inc... | 12/13/1983 |
| 4399189 | Magnetic recording medium A magnetic recording medium comprises a substrate coated with a magnetic layer comprising a magnetic powder and a first non-magnetic powder of Al2 O3 and/or Cr2 O3 at a ratio of 0.5 to 15 wt. % based on said mag... | 08/16/1983 |
| 4379800 | Cleaning tape for magnetic recording apparatus A cleaning tape for a magnetic recording apparatus comprises a substrate coated with a cleaning layer comprising magnetic iron oxide power as a main component and a non-magnetic abrasive power having Moh's scale of hardness of at least 6 and a binder wher... | 04/12/1983 |
| 4337288 | Magnetic recording medium A magnetic recording medium comprising a coated magnetic recording layer having video and chroma S/N ratios appropriately balanced with tape transporting characteristics is attained by controlling the magnetic layer to have a surface roughness such that t... | 06/29/1982 |
| 4275115 | Magnetic recording composition and article coated therewith A magnetic recording composition comprising a non-aqueous dispersion, in liquid dispersion medium, of a dispersed solid phase of a major proportion of magnetic powder and minor proportions of at least two types of non-magnetic powder. One type of the non-... | 06/23/1981 |
| 4015042 | Materials for magnetic recording having high resistance to wear and reduced abrasion on magnetic heads Magnetic recording elements comprising a magnetic layer containing dispersed particles which improve the wear resistance of the layer are disclosed. Such elements comprise a non-magnetic support and a magnetic recording layer that contains dispersed in a ... | 03/29/1977 |
