Patents by Inventor Katsuhiko Yamazaki
Katsuhiko Yamazaki has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7432000Abstract: The present invention provides a magnetic recording medium which has a back coat layer excellent in surface smoothness and durability and is excellent in electromagnetic conversion property. A magnetic recording medium, comprising at least a non-magnetic support, a lower non-magnetic layer on one surface of the non-magnetic support, an upper magnetic layer on the lower non-magnetic layer, and a back coat layer on the other surface of the non-magnetic support, wherein the lower non-magnetic layer contains at least carbon black, a non-magnetic inorganic powder other than carbon black, and a binder resin material, the upper magnetic layer contains at least a ferromagnetic powder, and a binder resin material, and the back coat layer contains at least carbon black, a non-magnetic inorganic powder other than carbon black, a carboxylic acid amine salt, a phosphate amine salt, and a binder resin material.Type: GrantFiled: December 19, 2006Date of Patent: October 7, 2008Assignee: TDK CorporationInventors: Takayoshi Kuwajima, Katsuhiko Yamazaki
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Patent number: 7425378Abstract: The present invention provides a magnetic recording medium which has a thin film magnetic layer considerably excellent in surface smoothness, and is excellent in electromagnetic conversion property. A magnetic recording medium comprising a non-magnetic support, a lower non-magnetic layer comprising at least a non-magnetic powder and a binder resin on one surface of the non-magnetic support, and a magnetic layer comprising at least a ferromagnetic powder and a binder resin on the lower non-magnetic layer, wherein when the magnetic recording medium is subjected to extraction treatment with water, 7 to 23 ?g of PO43? ions are extracted per 10 mm3 of the volume of the lower non-magnetic layer of the magnetic recording medium.Type: GrantFiled: July 26, 2004Date of Patent: September 16, 2008Assignee: TDK CorporationInventors: Katsuhiko Yamazaki, Tsutomu Ide, Takashi Handa, Akinori Nishizawa
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Publication number: 20080145710Abstract: The present invention provides a high-capacity magnetic recording medium which has a thinned back coat layer excellent in surface smoothness and durability and is excellent in electromagnetic conversion property. A magnetic recording medium comprising at least a non-magnetic support, a lower non-magnetic layer on one surface of the non-magnetic support, an upper magnetic layer on the lower non-magnetic layer, and a back coat layer on the other surface of the non-magnetic support, wherein the lower non-magnetic layer contains at least carbon black, a non-magnetic inorganic powder other than carbon black, and a binder resin material, the upper magnetic layer contains at least a ferromagnetic powder, and a binder resin material, and the back coat layer contains at least carbon black, a non-magnetic inorganic powder other than carbon black, a phosphate amine salt, and nitrocellulose resin as a binder resin material, and has a thickness of 0.3 to 0.8 ?m.Type: ApplicationFiled: December 17, 2007Publication date: June 19, 2008Applicant: TDK CorporationInventors: Takayoshi KUWAJIMA, Katsuhiko Yamazaki
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Publication number: 20080017073Abstract: A method for manufacturing magnetic paint or non-magnetic paint, which can produce a magnetic recording medium having excellent surface smoothness by appropriately setting the condition of a dispersion process for improving the dispersibility of the paint, and a magnetic recording medium are provided. The magnetic paint or the non-magnetic paint is produced by performing a dispersion process of a mixed solution, in which a magnetic powder or a non-magnetic powder is mixed into a binder solution containing a binder and a solvent, with a medium dispersion device. The method includes the steps of adjusting the viscosity of the mixed solution to 1,500 cP or less on a BL type viscometer at 20 rpm basis, and performing a dispersion process with the medium dispersion device using dispersion media having an average particle diameter of 0.5 mm or less at a dispersion circumferential speed of 8 to 15 m/s.Type: ApplicationFiled: September 20, 2007Publication date: January 24, 2008Applicant: TDK CORPORATIONInventors: Katsuhiko YAMAZAKI, Tsutomu Ide
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Patent number: 7288210Abstract: A method for manufacturing magnetic paint or non-magnetic paint, which can produce a magnetic recording medium having excellent surface smoothness by appropriately setting the condition of a dispersion process for improving the dispersibility of the paint, and a magnetic recording medium are provided. The magnetic paint or the non-magnetic paint is produced by performing a dispersion process of a mixed solution, in which a magnetic powder or a non-magnetic powder is mixed into a binder solution containing a binder and a solvent, with a medium dispersion device. The method includes the steps of adjusting the viscosity of the mixed solution to 1,500 cP or less on a BL type viscometer at 20 rpm basis, and performing a dispersion process with the medium dispersion device using dispersion media having an average particle diameter of 0.5 mm or less at a dispersion circumferential speed of 8 to 15 m/s.Type: GrantFiled: February 3, 2006Date of Patent: October 30, 2007Assignee: TDK CorporationInventors: Katsuhiko Yamazaki, Tsutomu Ide
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Publication number: 20070231471Abstract: A method for manufacturing a magnetic recording medium is provided which has high recording density and which is less likely to cause problems of a magnetic tape such as inappropriate contact with a head, unstable running, and damage. A back-coat layer containing plate-like inorganic pigment (plate-like inorganic pigment-containing layer) is formed over a non-magnetic support to produce an intermediate product having the support and the back-coat layer. Then, the intermediate product is subjected to calendering between at least one pair of metal rolls.Type: ApplicationFiled: March 26, 2007Publication date: October 4, 2007Applicant: TDK CORPORATIONInventors: Katsuhiko Yamazaki, Tsutomu Ide
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Publication number: 20070141402Abstract: The present invention provides a magnetic recording medium which has a back coat layer excellent in surface smoothness and durability and is excellent in electromagnetic conversion property. A magnetic recording medium, comprising at least a non-magnetic support, a lower non-magnetic layer on one surface of the non-magnetic support, an upper magnetic layer on the lower non-magnetic layer, and a back coat layer on the other surface of the non-magnetic support, wherein the lower non-magnetic layer contains at least carbon black, a non-magnetic inorganic powder other than carbon black, and a binder resin material, the upper magnetic layer contains at least a ferromagnetic powder, and a binder resin material, and the back coat layer contains at least carbon black, a non-magnetic inorganic powder other than carbon black, a carboxylic acid amine salt, a phosphate amine salt, and a binder resin material.Type: ApplicationFiled: December 19, 2006Publication date: June 21, 2007Applicant: TDK CORPORATIONInventors: Takayoshi KUWAJIMA, Katsuhiko Yamazaki
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Patent number: 7198733Abstract: A formed substrate, wherein the surface of the valve-acting metal having a dielectric film is at least partially covered with an oxide comprising Si, valve-acting metal element and oxygen, preferably, wherein the content of Si in the formed foil having an aluminum oxide dielectric film decreases continuously from the surface of the dielectric film toward the inner part in some regions in the aluminum dielectric film thickness; a method for producing the formed substrate; and a solid electrolytic capacitor comprising a solid electrolyte on the formed substrate. A solid electrolytic capacitor manufactured by using a formed substrate according to the present invention, improved in adhesion to an electrically conducting polymer (solid electrolyte) with its area coverage contacting the polymer being sufficiently large, is increased in the electrostatic capacitance among individual capacitors and improved in the LC yield as compared with capacitors otherwise manufactured.Type: GrantFiled: June 11, 2002Date of Patent: April 3, 2007Assignee: Showa Denko K.K.Inventors: Hiroshi Konuma, Katsuhiko Yamazaki, Takenori Umikawa, Masakazu Yagi, Tamotsu Yamashita
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Patent number: 7175781Abstract: A solid electrolytic capacitor includes a valve acting metal having microfine pores, a dielectric film formed on a surface of the valve acting metal, and a solid electrolyte layer provided on the dielectric film, in which at least a portion of the solid electrolyte layer is of a lamellar structure. In particular, a solid electrolytic capacitor includes an electrically conducting polymer having a specified condensed ring structure containing (1) a solid electrolyte layer containing a sulfoquinone anion, and (2) a solid electrolyte layer containing an anthracenesulfonate ion and other anion.Type: GrantFiled: September 14, 2004Date of Patent: February 13, 2007Assignee: Showa Denko K.K.Inventors: Hiroshi Konuma, Koro Shirane, Ryuji Monden, Atsushi Sakai, Yuji Furuta, Katsuhiko Yamazaki, Toru Sawaguchi, Hideko Ohata, Yoshiaki Ikenoue
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Publication number: 20070009655Abstract: A method of manufacturing a magnetic recording medium comprising forming a reinforcing layer on a first surface of a non-magnetic support, performing a surface treatment that applies external energy to a surface of the reinforcing layer, and forming a functional layer on the surface of the reinforcing layer that has been subjected to the surface treatment. By doing so, the functional layer can be prevented from peeling off the reinforcing layer with no increase in manufacturing cost or fall in manufacturing yield.Type: ApplicationFiled: July 5, 2006Publication date: January 11, 2007Applicant: TDK CORPORATIONInventors: Katsuhiko YAMAZAKI, Tsutomu IDE
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Patent number: 7160481Abstract: A method for manufacturing magnetic paint is provided, wherein a dispersion condition is appropriately controlled to excellently disperse a magnetic powder composed of fine particles adaptable for a higher recording density, so that magnetic paint having excellent dispersibility can be prepared, and a magnetic recording medium having excellent surface roughness is provided. The magnetic paint is prepared by the step of subjecting a mixed solution containing at least a binder, a solvent, and a magnetic powder to a dispersion treatment with a dispersion device by the use of dispersion media through at least dispersion step, wherein the dispersion in the main dispersion step is carried out by the use of dispersion media having an average particle diameter y (mm) satisfying the relationship, which is represented by formula y?0.01x, with the average maximum diameter x (nm) of the magnetic powder.Type: GrantFiled: January 28, 2004Date of Patent: January 9, 2007Assignee: TDK CorporationInventors: Katsuhiko Yamazaki, Tsutomu Ide, Hiroyuki Tanaka
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Publication number: 20060292402Abstract: A magnetic recording medium has at least a non-magnetic layer and a magnetic layer formed in that order on one surface of a non-magnetic support. The non-magnetic layer is formed using a non-magnetic coating composition including a (meth)acryloyl group in a range of 11 mmol to 30 mmol, inclusive relative to 100 parts by weight of non-magnetic powder.Type: ApplicationFiled: June 14, 2006Publication date: December 28, 2006Applicant: TDK CORPORATIONInventors: Tsutomu IDE, Katsuhiko YAMAZAKI, Tomoyuki KOTAKI
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Publication number: 20060222906Abstract: A radiation curing polyurethane resin for a magnetic recording medium which is capable of realizing a lower non-magnetic layer that can secure sufficient coating film strength with a lower radiation dose. A polyurethane resin which contains active hydrogen, and a sulfur-containing polar group in an amount of not less than 0.05 mmol/g to not more than 0.10 mmol/g, inclusive, but does not contain a basic polar group in its molecule and is formed only by an aliphatic segment, is modified on the active hydrogen into a radiation curing polyurethane resin by a compound having an acrylic double bond.Type: ApplicationFiled: March 30, 2006Publication date: October 5, 2006Applicant: TDK CorporationInventors: Hiroyuki Tanaka, Tsutomu Ide, Katsuhiko Yamazaki
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Publication number: 20060210839Abstract: A magnetic recording medium which makes it possible to further increase the recording capacity while maintaining a required flexibility thereof. A magnetic tape has a lower non-magnetic layer and a magnetic layer formed on one surface of a base film in the mentioned order. The lower non-magnetic layer is formed of a non-magnetic coating material containing a non-magnetic powder, an electron beam curing binder, a dispersant having an amine group, and a thermosetting agent.Type: ApplicationFiled: March 14, 2006Publication date: September 21, 2006Applicant: TDK CorporationInventors: Tsutomu Ide, Katsuhiko Yamazaki, Tomoyuki Kotaki, Sadafumi Iijima
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Publication number: 20060179627Abstract: A method for producing a solid electrolytic capacitor, comprising coating a solution containing a monomer of an electroconducting polymer and a solution containing an oxidizing agent in repeating sequence on a valve-acting metal anode having formed on the surface thereof an oxide dielectric film, and then polymerizing wherein the electroconducting polymer is formed by setting the humidity in the atmosphere of polymerization process to from 10% to less than 60%.Type: ApplicationFiled: April 6, 2006Publication date: August 17, 2006Inventors: Atsushi Sakai, Ryuji Monden, Toru Sawaguchi, Katsuhiko Yamazaki, Yuji Furuta, Hideki Ohata
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Patent number: 7087292Abstract: A solid electrolytic capacitor comprises an electrically conducting polymer composition formed on the surface of an oxide film which is formed on a valve-acting metal, by specifying the viscosity of an oxidizing agent solution and/or a monomer solution, particularly by specifying the viscosity to less than about 100 cp. A solid electrolytic capacitor can comprise an electroconducting polymer composition formed on the surface of an oxide film layer which is formed on a valve-acting metal, wherein a monomer compound or a derivative thereof as a repeating unit is polymerized by setting the humidity in the atmosphere to from about 10% to less than about 60%.Type: GrantFiled: December 24, 2003Date of Patent: August 8, 2006Assignee: Showa Denko K.K.Inventors: Atsushi Sakai, Ryuji Monden, Toru Sawaguchi, Katsuhiko Yamazaki, Yuji Furuta, Hideki Ohata
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Publication number: 20060124887Abstract: A method for manufacturing magnetic paint or non-magnetic paint, which can produce a magnetic recording medium having excellent surface smoothness by appropriately setting the condition of a dispersion process for improving the dispersibility of the paint, and a magnetic recording medium are provided. The magnetic paint or the non-magnetic paint is produced by performing a dispersion process of a mixed solution, in which a magnetic powder or a non-magnetic powder is mixed into a binder solution containing a binder and a solvent, with a medium dispersion device. The method includes the steps of adjusting the viscosity of the mixed solution to 1,500 cP or less on a BL type viscometer at 20 rpm basis, and performing a dispersion process with the medium dispersion device using dispersion media having an average particle diameter of 0.5 mm or less at a dispersion circumferential speed of 8 to 15 m/s.Type: ApplicationFiled: February 3, 2006Publication date: June 15, 2006Applicant: TDK CorporationInventors: Katsuhiko Yamazaki, Tsutomu Ide
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Patent number: 7060205Abstract: The present invention relates to a solid electrolytic capacitor comprising a solid electrolyte layer and an electrically conducting layer comprising metallic powder or an electrically conducting layer comprising an electrically conducting carbon layer and a layer formed thereon and comprising metallic powder in which at least one of said layers contains a rubber-like elastic material; a production process thereof; a solid electrolyte for use in the solid electrolytic capacitor; a production process of the solid electrolyte; an electrically conducting paste for use in the solid electrolytic capacitor; and an electrically carbon conducting paste for use in the solid electrolytic capacitor. The solid electrolytic capacitor of the present invention can be made compact and can be endowed with high-capacitance and low-impedance and is excellent in external force-relaxing properties, productivity, heat resistance and moisture resistance, etc.Type: GrantFiled: May 18, 2004Date of Patent: June 13, 2006Assignee: Showa Denko Kabushiki KaishaInventors: Ryuji Monden, Katsuhiko Yamazaki, Atsushi Sakai, Yuji Furuta, Hideki Ohata, Koro Shirane, Hiroshi Konuma
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Publication number: 20060019127Abstract: The present invention provides a magnetic recording medium which has a thin film magnetic layer considerably excellent in surface smoothness, and is excellent in electromagnetic conversion property. A magnetic recording medium comprising a non-magnetic support, a lower non-magnetic layer comprising at least a non-magnetic powder and a binder resin on one surface of the non-magnetic support, and a magnetic layer comprising at least a ferromagnetic powder and a binder resin on the lower non-magnetic layer, wherein when the magnetic recording medium is subjected to extraction treatment with water, 7 to 23 ?g of PO43? ions are extracted per 10 mm3 of the volume of the lower non-magnetic layer of the magnetic recording medium.Type: ApplicationFiled: July 26, 2004Publication date: January 26, 2006Applicant: TDK CORPORATIONInventors: Katsuhiko Yamazaki, Tsutomu Ide, Takashi Handa, Akinori Nishizawa
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Patent number: 6954351Abstract: A method for producing a solid electrolytic capacitor, involving a step of loading a metal oxide on at least a part of the surface in the anode part of a capacitor element having a valve-acting metal substrate having there on a solid electrolyte, the valve-acting metal substrate having a dielectric film obtained by the electrochemical forming, and a solid electrolytic capacitor obtained by stacking two or more single plate capacitor elements having a metal oxide on at least a part of the surface in the anode part of a capacitor element comprising a valve-acting metal substrate having thereon a solid electrolyte, the valve-acting metal substrate having a dielectric film obtained by the electrochemical forming.Type: GrantFiled: August 21, 2002Date of Patent: October 11, 2005Assignee: Showa Denko K.K.Inventors: Hiroshi Konuma, Eiji Komazawa, Katsuhiko Yamazaki