Patents by Inventor Hideshi Katayama
Hideshi Katayama 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: 6881377Abstract: Provided is an ultrafine nickel powder suitable for a laminated ceramic capacitor electrode material. According to the ultrafine nickel powder, cracks and/or delamination are not liable to generate in the process for producing a ceramic capacitor, and its internal electrode can be made into a thinner layer, and the electric risistivity of the capacitor-can be made low. The ultrafine nickel powder has an average particle size of 0.1-1.0 ?m, having the sulfur content of 0.02-1.0% by weight, and particles thereof being spherical, thereby exhibiting excellent properties. They can be produced by vapor phase hydrogen-reducing process using nickel chloride vapor.Type: GrantFiled: May 21, 2003Date of Patent: April 19, 2005Assignee: Kawatetsu Mining Co., Ltd.Inventors: Hideshi Katayama, Kan Saito, Shuetsu Ogasawara, Takao Hamada
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Publication number: 20030196516Abstract: Provided is an ultrafine nickel powder suitable for a laminated ceramic capacitor electrode material. According to the ultrafine nickel powder, cracks and/or delamination are not liable to generate in the process for producing a ceramic capacitor, and its internal electrode can be made into a thinner layer, and the electric risistivity of the capacitor-can be made low. The ultrafine nickel powder has an average particle size of 0.1-1.0 &mgr;m, having the sulfur content of 0.02-1.0% by weight, and particles thereof being spherical, thereby exhibiting excellent properties. They can be produced by vapor phase hydrogen-reducing process using nickel chloride vapor.Type: ApplicationFiled: May 21, 2003Publication date: October 23, 2003Applicant: KAWATETSU MINING CO., LTD.Inventors: Hideshi Katayama, Kan Saito, Shuetsu Ogasawara, Takao Hamada
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Patent number: 6596052Abstract: Provided is an ultrafine nickel powder suitable for a laminated ceramic capacitor electrode material. According to the ultrafine nickel powder, cracks and/or delamination are not liable to generate in the process for producing a ceramic capacitor, and its internal electrode can be made into a thinner layer, and the electric risistivity of the capacitor can be made low. The ultrafine nickel powder has an average particle size of 0.1-1.0 &mgr;m, having the sulfur content of 0.02-1.0% by weight, and particles thereof being spherical, thereby exhibiting excellent properties. They can be produced by vapor phase hydrogen-reducing process using nickel chloride vapor.Type: GrantFiled: October 10, 2001Date of Patent: July 22, 2003Assignee: Kamatetsu Mining Co., Ltd.Inventors: Hideshi Katayama, Kan Saito, Shuetsu Ogasawara, Takao Hamada
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Patent number: 6402803Abstract: Provided is an ultrafine nickel powder suitable for a laminated ceramic capacitor electrode material. According to the ultrafine nickel powder, cracks and/or delamination are not liable to generate in the process for producing a ceramic capacitor, and its internal electrode can be made into a thinner layer, and the electric risistivity of the capacitor can be made low. The ultrafine nickel powder has an average particle size of 0.1-1.0 &mgr;m, having the sulfur content of 0.02-1.0% by weight, and particles thereof being spherical, thereby exhibiting excellent properties. They can be produced by vapor phase hydrogen-reducing process using nickel chloride vapor.Type: GrantFiled: August 26, 1998Date of Patent: June 11, 2002Assignee: Kawatetsu Mining Co., Ltd.Inventors: Hideshi Katayama, Kan Saito, Shuetsu Ogasawara, Takao Hamada
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Publication number: 20020035891Abstract: Provided is an ultrafine nickel powder suitable for a laminated ceramic capacitor electrode material. According to the ultrafine nickel powder, cracks and/or delamination are not liable to generate in the process for producing a ceramic capacitor, and its internal electrode can be made into a thinner layer, and the electric risistivity of the capacitor can be made low. The ultrafine nickel powder has an average particle size of 0.1-1.0 &mgr;&mgr;m, having the sulfur content of 0.02-1.0 % by weight, and particles thereof being spherical, thereby exhibiting excellent properties. They can be produced by vapor phase hydrogen-reducing process using nickel chloride vapor.Type: ApplicationFiled: October 10, 2001Publication date: March 28, 2002Applicant: Kawatetsu Mining Co., Ltd.Inventors: Hideshi Katayama, Kan Saito, Shuetsu Ogasawara, Takao Hamada
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Patent number: 6312496Abstract: A nickel ultrafine powder which is characterized by having an average particle diameter of 0.2 to 0.6 &mgr;m and containing coarse particles whose particle diameter is larger than 2.5 times the average particle diameter in an amount less than 0.1% in terms of number-size distribution. It is produced from nickel chloride vapor by reduction with hydrogen in the gas phase. It gives thin internal electrodes (which contributes to high capacity) with only a few short circuits across them.Type: GrantFiled: December 14, 1998Date of Patent: November 6, 2001Assignee: Kawatetsu Mining Co., Ltd.Inventors: Hideshi Katayama, Kan Saito
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Patent number: 5266277Abstract: Disclosed herein is a gas dispersing device to be employed in a fluidized bed preliminary reducing furnace. The gas dispersing device is constructed of a plurality of rotatable round bars arranged in multiple stages so as to form a grate. The gas dispersing device includes a rotating mechanism for rotating each bar.According to the present invention, deformation of the bars due to a temperature change thereof can be avoided to thereby extend a life of the dispersing device. Furthermore, blinding of the dispersing device can be prevented to thereby effectuate a stable operation of a fluidized bed. Accordingly, productivity in the fluidized bed reducing furnace is improved, and labor saving is realized.Type: GrantFiled: July 18, 1991Date of Patent: November 30, 1993Assignee: Kawasaki Steel CorporationInventors: Hideshi Katayama, Hiroshi Itaya, Masahiko Satoh, Kazuo Kimura
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Patent number: 5131942Abstract: A method and apparatus for producing molten metal from powder state ore through smelting process to be performed in a shaft furnace, utilized the reducing material having grain size greater than that n-times of the gas flow velocity corresponding grain size to charge from the top of a shaft furnace for forming fluidized bed at the upper section of the furnace and a reducing material filled section below the fluidized bed. The method and apparatus for smelting the powder state ore also takes the reducing material having smaller grain size to be blown into the furnace through tuyeres.Type: GrantFiled: May 4, 1990Date of Patent: July 21, 1992Assignee: Kawasaki Steel CorporationInventors: Hideshi Katayama, Takao Hamada, Shinobu Takeuchi, Takashi Ushijima, Hideyuki Momokawa, Hiroshi Itaya
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Patent number: 4505745Abstract: A method of producing amorphous mother alloy is disclosed, which comprises charging raw material, carbonaceous reducing agent and secondary material into a smelting furnace and then smelting to produce Fe-B-Si series molten metal having a B-Si composition range which lies within an area represented by the trapezoidal area abcd shown in FIG. 2 of the accompanying drawings. The amorphous mother alloy is used to produce an amorphous starting material by diluting with molten steel.Type: GrantFiled: August 18, 1983Date of Patent: March 19, 1985Assignee: Kawasaki Steel CorporationInventors: Takao Hamada, Nobuo Tsuchiya, Yo Ito, Toshihiro Inatani, Yoshiyasu Takada, Mitsuo Sumito, Toshimitsu Koitabashi, Hideshi Katayama