Patents by Inventor Tsutomu Okutomi
Tsutomu Okutomi 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: 5056702Abstract: A method of manufacturing a semiconductor device comprising a ceramics cylinder, a metal seal member closing an open end of the cylinder, a semiconductor element located within the cylinder and having electrodes, and leads or electrodes connected to the electrodes of the semiconductor element and extending from the cylinder. The method comprises the steps of coating powder of active metal consisting of Ti and/or Zr on the end face of the ceramics cylinder without heating the ceramics cylinder, in an amount of 0.1 mg/cm.sup.2 to 10 mg/cm.sup.2, mounting a layer of brazing filler metal on the end face of the ceramics cylinder, which have been coated with the powder of the active metal, placing the metal seal member on the layer of brazing filler metal, and heating the ceramics cylinder, the metal seal member, and the layer of brazing filler metal, thereby melting the layer of brazing filler metal and, thus, brazing the metal seal member to the open end of the ceramics cylinder.Type: GrantFiled: October 10, 1989Date of Patent: October 15, 1991Assignee: Kabushiki Kaisha ToshibaInventors: Masako Nakahashi, Makoto Shirokane, Hiromitsu Takeda, Tatsuo Yamazaki, Tsutomu Okutomi, Shozi Niwa, Mikio Okawa, Mitsutaka Homma, Seiichi Suenaga, Shigeru Miyakawa
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Patent number: 5045281Abstract: A contact forming material for a vacuum interrupter comprising: from 25% to 65% by weight of a highly conductive component comprising Ag and Cu, and from 35% to 75% by weight of an arc-proof component selected from the group consisting of Ti, V, Cr, Zr, Mo, W and their carbides and borides, and mixtures thereof wherein the highly conductive component of the contact forming material comprises (i) a first highly conductive component region composed of a first discontinuous phase having a thickness or width of no more than 5 micrometers and a first matrix surrounding the first discontinuous phase, and (ii) a second highly conductive component region composed of a second discontinuous phase having a thickness or width of at least 5 micrometers and a second matrix surrounding the second discontinuous phase, wherein the first discontinuous phase in the first highly conductive component region is finely and uniformly dispersed in the first matrix at intervals of no more than 5 micrometers, and wherein the amount ofType: GrantFiled: February 27, 1990Date of Patent: September 3, 1991Assignee: Kabushiki Kaisha ToshibaInventors: Tsutomu Okutomi, Mikio Okawa, Atsushi Yamamoto, Tsuneyo Seki, Yoshinari Satoh, Mitsutaka Honma, Seishi Chiba, Tadaaki Sekiguchi
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Patent number: 4940863Abstract: A vacuum breaker contact produced according to the coating step of forming a metal coated layer comprising at least one metal selected from the group consisting of Cu, Ag, Ni, Sn, In, Fe and alloys thereof on at least a part of the surface of the contact substrate having a predetermined shape to a thickness of 10 .mu.m or less, and the diffusion step of having a part of said metal coated layer diffused into said contact substrate.Type: GrantFiled: May 25, 1989Date of Patent: July 10, 1990Assignee: Kabushiki Kaisha ToshibaInventors: Hajime Fujita, Seishi Chiba, Tsutomu Okutomi, Kazuo Suzuki, Masami Idehara, Mitsutaka Honma, Seikichi Takashima
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Patent number: 4917642Abstract: A method of manufacturing an air-tight ceramic container is disclosed. This method includes the steps of coating an active metal consisting of Ti and/or Zr on an opening end face of a ceramic tubular member in an amount of 0.1 to 10 mg/cm.sup.2, thereby forming an active metal layer, placing a brazing filler metal on the active metal layer, placing a metal cover member for shielding an opening portion of the ceramic tubular member so that a peripheral portion end face of the metal cover member is in contact with the brazing filler metal, and melting the brazing filler metal by heating, thereby brazing the metal cover member to the opening end face of the ceramic tubular member.Type: GrantFiled: April 1, 1988Date of Patent: April 17, 1990Assignee: Kabushiki Kaisha ToshibaInventors: Masako Nakahashi, Makoto Shirokane, Hiromitsu Takeda, Tatsuo Yamazaki, Tsutomu Okutomi, Shozi Niwa, Mikio Okawa, Mitsutaka Homma
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Patent number: 4830821Abstract: A contact forming material for a vacuum valve or vacuum circuit breaker comprising (a) a conductive material consisting of copper and/or silver, and (b) an arc-proof material consisting of chromium, titanium, zirconium, or an alloy thereof wherein the amount of said arc-proof material present in said conductive material matrix is no more than 0.35% by weight. This contact forming material is produced by a process which comprises the steps of compacting arc-proof material powder into a green compact, sintering said green compact to obtain a skeleton of the arc-proof material, infiltrating the voids of said skeleton with a conductive material, and cooling the infiltrated material. The contact forming material can provide contacts for a vacuum valve or vacuum circuit breaker which has excellent characteristics such as temperature rise characteristic and contact resistance characteristic.Type: GrantFiled: July 26, 1988Date of Patent: May 16, 1989Assignee: Kabushiki Kaisha ToshibaInventors: Tsutomu Okutomi, Seishi Chiba, Mikio Okawa, Tadaaki Sekiguchi, Hiroshi Endo, Tsutomu Yamashita
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Patent number: 4777335Abstract: A contact forming material for a vacuum valve or vacuum circuit breaker comprising (a) a conductive material consisting of copper and/or silver, and (b) an arc-proof material consisting of chromium, titanium, zirconium, or an alloy thereof wherein the amount of said arc-proof material present in said conductive material matrix is no more than 0.35% by weight. This contact forming material is produced by a process which comprises the steps of compacting arc-proof material powder into a green compact, sintering said green compact to obtain a skeleton of the arc-proof material, infiltrating the voids of said skeleton with a conductive material, and cooling the infiltrated material. The contact forming material can provide contacts for a vacuum valve or vacuum circuit breaker which has excellent characteristics such as temperature rise characteristic and contact resistance characteristic.Type: GrantFiled: January 20, 1987Date of Patent: October 11, 1988Assignee: Kabushiki Kaisha ToshibaInventors: Tsutomu Okutomi, Seishi Chiba, Mikio Okawa, Tadaaki Sekiguchi, Hiroshi Endo, Tsutomu Yamashita
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Patent number: 4489291Abstract: A circuit breaker fitted with a parallel resistor and provided with main contacts and resistor contacts arranged electrically in parallel with the main contacts wherein the resistor is formed of a material selected from the group consisting of Cr, CrN, Cr.sub.3 C.sub.2, CrB, NiO and Mgo. The resistor element generally is made of a material in which the product of the specific heat expressed in Cal/g.degree.C. with the density expressed in g/cm.sup.3 is at least 0.7.Type: GrantFiled: September 30, 1982Date of Patent: December 18, 1984Assignee: Tokyo Shibaura Denki Kabushiki KaishaInventors: Mitsuru Toyoda, Eiichi Haginomori, Masanori Ishimatsu, Tsutomu Okutomi
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Patent number: 4345130Abstract: Disclosed is an electrical contact of composite layer type which comprises an interrupting layer consisting of Cu-W alloy, Cu-WC alloy or Cu-W-WC alloy containing 20 to 60 wt % of Cu and being bonded to the top surface of a base plate, and a contacting layer consisting of Ag-WC alloy, Ag-W alloy or Ag-W-WC alloy containing 20 to 60 wt % of Ag and being bonded to the top surface of said interrupting layer.Type: GrantFiled: December 3, 1980Date of Patent: August 17, 1982Assignee: Tokyo Shibaura Denki Kabushiki KaishaInventors: Tsutomu Okutomi, Masachika Iida, Kazuyoshi Kuwabara, Hisashi Yoshino, Eiichi Takayanagi
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Patent number: 4129761Abstract: A vacuum circuit breaker comprising an evacuated envelope and a pair of movable conductive rods within the envelope having points of contact equipped with contact members, wherein the conductive rods slide into and out of engaging contact, the improvement comprising at least one of said contacts having circuit making and breaking contact members formed of an alloy consisting essentially of 9.4 wt% to 15 wt% Al, 4.5 wt% to 20 wt% Ni, 0.1 wt% to 10 wt% of at least one metal (Me) selected from the group consisting of bismuth, tellurium, selenium, antimony and magnesium with copper as the balance of the alloy, wherein said alloy contains an .alpha. copper phase (Cu(.alpha.)) containing nickel and a .gamma. copper phase (Cu(.gamma.)) containing nickel substantially dispersed throughout said alloy.Type: GrantFiled: May 27, 1977Date of Patent: December 12, 1978Assignee: Tokyo Shibaura Electric Co., Ltd.Inventors: Tsutomu Okutomi, Hisashi Yoshino, Seishi Chiba, Tadahito Tsutsumi, Kouichi Tejima
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Patent number: 4129760Abstract: A vacuum circuit breaker comprising an evacuated envelope and a pair of movable conductive rods within the envelope having points of contact equipped with contact members, wherein the conductive rods slide into and out of engaging contact, the improvement comprising at least one of said contacts having circuit-making and breaking members formed of an alloy consisting essentially of 4 wt% to 9.4 wt% aluminum, 0.5 wt% to 3.5 wt% of beryllium, 0.1 wt% to 10 wt% of Me.sub.1, wherein Me.sub.1 is at least one metal selected from the group consisting of bismuth, tellurium, selenium, antimony, magnesium and lead, and the balance copper.Type: GrantFiled: May 27, 1977Date of Patent: December 12, 1978Assignee: Tokyo Shibaura Electric Co., Ltd.Inventors: Tsutomu Okutomi, Hisashi Yoshino, Seishi Chiba