Patents by Inventor Tamotsu Ogawa
Tamotsu Ogawa 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: 10234374Abstract: A method is used for selecting a boundary sample. The method includes acquiring a deterioration trend of a new device by performing a deterioration acceleration treatment to the new device, acquiring deterioration trends of a plurality of repaired devices which have been repaired after long-term use by performing a deterioration acceleration treatment to the plurality of repaired devices, calculating an upper limit of deterioration of the repaired device based on the deterioration trend of the new device, and selecting a boundary sample indicating a limit state in which the device can be reused as a standard of reuse of the device by specifying a repaired device having the largest deterioration among the repaired devices having a deterioration not larger than the upper limit.Type: GrantFiled: March 15, 2017Date of Patent: March 19, 2019Assignee: Tokyo Electric Power Company Holdings, IncorporatedInventors: Noboru Kobayashi, Tamotsu Ogawa, Chikara Morooka, Yuki Matsuoka, Hideharu Oniki
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Publication number: 20170185427Abstract: A reuse support system is provided. The system includes an acquisitor which acquires skill data of workers, a grantor which grants a work license to the workers based on the acquired skill data of the workers and stores the granted work license for each of the workers in a storage, and a provider which reads the work license from the storage in response to authentication operation of the workers and provides an image according to the read work license.Type: ApplicationFiled: March 16, 2017Publication date: June 29, 2017Applicant: Tokyo Electric Power Company Holdings, IncorporatedInventors: Takao HIRAI, Tamotsu OGAWA, Chikara MOROOKA, Sumio ENOMOTO, Yuki MATSUOKA
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Publication number: 20170182519Abstract: A method for manufacturing a regenerated product includes a selection step for selecting a recovered regeneration object based on a first evaluation standard indicating a state of a surface of the regeneration object, a rust-removing step for performing a rust-removing treatment to the regeneration object selected by the selection step, and a judgement step for judging whether to terminate the rust-removing treatment in the rust-removing step based on a second evaluation standard indicating the state of the surface of the regeneration object.Type: ApplicationFiled: March 15, 2017Publication date: June 29, 2017Applicant: Tokyo Electric Power Company Holdings, IncorporatedInventors: Noboru KOBAYASHI, Tamotsu OGAWA, Chikara MOROOKA, Yuki NOMOTO, Kazuhiro ENDO, Kenji FUKASHIRO, Motoyoshi SUZUKI
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Publication number: 20170184487Abstract: A method is used for selecting a boundary sample. The method includes acquiring a deterioration trend of a new device by performing a deterioration acceleration treatment to the new device, acquiring deterioration trends of a plurality of repaired devices which have been repaired after long-term use by performing a deterioration acceleration treatment to the plurality of repaired devices, calculating an upper limit of deterioration of the repaired device based on the deterioration trend of the new device, and selecting a boundary sample indicating a limit state in which the device can be reused as a standard of reuse of the device by specifying a repaired device having the largest deterioration among the repaired devices having a deterioration not larger than the upper limit.Type: ApplicationFiled: March 15, 2017Publication date: June 29, 2017Applicant: Tokyo Electric Power Company Holdings, Incorporate dInventors: Noboru KOBAYASHI, Tamotsu OGAWA, Chikara MOROOKA, Yuki MATSUOKA, Hideharu ONIKI
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Publication number: 20170185426Abstract: A reuse support system of an embodiment includes a display controller which displays, on a display, an image including an image of a boundary sample which serves as a reference for reuse of a facility in response to operation of a worker, an acceptor which accepts selection of a reuse mode of the facility, and a manager which manages a delivery destination of the facility based at least in part on the reuse mode of the facility selected by the acceptor.Type: ApplicationFiled: March 16, 2017Publication date: June 29, 2017Applicant: Tokyo Electric Power Company Holdings, IncorporatedInventors: Noboru KOBAYASHI, Tamotsu OGAWA, Chikara MOROOKA, Yuki MATSUOKA
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Patent number: 5417773Abstract: The present invention provides a method for producing a rare earth alloy magnet powder exhibiting stable and superior magnetic properties using hydrogenation followed by dehydrogenation. In a method for producing a rare earth alloy magnet powder wherein a homogenized rare earth alloy magnet alloy material is subjected to hydrogenation at a temperature in a range between 750.degree. C. and 950.degree. C., followed by dehydrogenation at a temperature in a range between 750.degree. C. and 950.degree. C.; cooled; and crushed, both the hydrogenation and the dehydrogenation are carried out in a vacuum tube furnace; and the alloy material in the dehydrogenation step maintains a temperature drop of at most 50.degree. C. due to an endothermic reaction which occurs during the dehydrogenation step.Type: GrantFiled: October 6, 1994Date of Patent: May 23, 1995Assignee: Mitsubishi Materials CorporationInventors: Ryoji Nakayama, Takuo Takeshita, Yoshinari Ishii, Tamotsu Ogawa
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Patent number: 5395462Abstract: A hot press molded body or an HIP molded body having one of a composition comprisingR: 10-20 atomic %, B: 3-20 atomic %, anda total amount of one or a plurality of Ga, Zr, and Hf: 0.001-5.0 atomic %,a remainder comprising Fe and unavoidable impurities; ora composition comprisingR: 10-20 atomic %, B: 3-20 atomic %, anda total amount of one or a plurality of Ti, V, Nb, Ta, Al, and Si: 0.001-5.0 atomic %,a remainder comprising Fe and unavoidable impurities; ora composition comprising Co: 0.1-50 atomic % added to one of the above compositions, havingan aggregate structure of crystallized grains having as a main phase thereof a R.sub.2 Fe.sub.14 B type or R.sub.2 (Fe, Co).sub.14 B type intermetallic compound having a tetragonal structure, the crystallized grains having dimensions of 0.05-20 .mu.Type: GrantFiled: February 23, 1993Date of Patent: March 7, 1995Assignee: Mitsubishi Materials CorporationInventors: Takuo Takeshita, Ryoji Nakayama, Tamotsu Ogawa
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Patent number: 5338371Abstract: There is disclosed a R--Fe--B or R--Fe--Co--B alloy permanent magnet powder which may contain Ga, Zr or Hf, or may further contain Al, Si or V. Each individual particle of the powder includes a structure of recrystallized grains containing a R.sub.2 Fe.sub.14 B or R.sub.2 (Fe,Co).sub.14 B intermetallic compound phase. The intermetallic compound phase has recrystallized grains of a tetragonal crystal structure having an average crystal grain size of 0.05 to 20 .mu.m. At least 50% by volume of the recrystallized grains of the aggregated structure are formed so that a ratio of the greatest dimension to the smallest dimension is less than 2 for each recrystallized grain. In order to manufacture the magnet powder, regenerative material and alloy material are prepared and their temperature is elevated in a hydrogen atmosphere. Then, the alloy material and the regenerative material are held in the same atmosphere at a temperature or 750.degree. C. to 950.degree. C., and then held in a vacuum at 750.degree. C.Type: GrantFiled: November 19, 1992Date of Patent: August 16, 1994Assignee: Mitsubishi Metal CorporationInventors: Ryoji Nakayama, Takuo Takeshita, Tamotsu Ogawa
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Patent number: 5250206Abstract: A R-Fe-B or R-Fe-Co-B permanent magnet powder excellent in magnetic anisotropy and corrosion resistivity, having powder particles. The powder particles each consist essentially of, in atomic percentage:R: 10-20%B: 3-20%;at least one element selected from the group consisting of Ti, V, Nb, Ta, Al, and Si: 0.001-5.0%; andFe and inevitable impurities: the balance,The R-Fe-Co-B magnet powder further contains 0.1-50% Co.The powder particles each have an aggregated recrystallized structure having a main phase thereof formed by a R.sub.2 Fe.sub.14 B or R.sub.2 (Co,Fe).sub.14 B type intermetallic compound phase having a tetragonal structure. The intermetallic compound phase is formed of recrystallized grains aggregated therein and includes at least 50 volumetric % of recrystallized grains having a ratio b/a smaller than 2 provided that a is designated by the smallest diameter of each of the recrystallized grains, and b is by the largest diameter thereof.Type: GrantFiled: September 19, 1991Date of Patent: October 5, 1993Assignee: Mitsubishi Materials CorporationInventors: Ryoji Nakayama, Takuo Takeshita, Tamotsu Ogawa
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Patent number: 5228930Abstract: There is disclosed a R-Fe-B or R-Fe-Co-B alloy permanent magnet powder which may contain Ga, Zr or Hf, or may further contain Al, Si or V. Each individual particle of the powder includes a structure of recrystallized grains containing a R.sub.2 Fe.sub.14 B or R.sub.2 (Fe,Co).sub.14 B intermetallic compound phase. The intermetallic compound phase has recrystallized grains of a tetragonal crystal structure having an average crystal grain size of 0.05 to 20 .mu.m. At least 50% by volume of the recrystallized grains of the aggregated structure are formed so that a ratio of the greatest dimension to the smallest dimension is less than 2 for each recrystallized grain. In order to manufacture the magnet powder, regenerative material and alloy material are prepared and their temperature is elevated in a hydrogen atmosphere. Then, the alloy material and the regenerative material are held in the same atmosphere at a temperature of 750.degree. C. to 950.degree. C., and then held in a vacuum at 750.degree. C. to 950.Type: GrantFiled: July 31, 1990Date of Patent: July 20, 1993Assignee: Mitsubishi Materials CorporationInventors: Ryoji Nakayama, Takuo Takeshita, Tamotsu Ogawa
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Patent number: 5110374Abstract: In a rare earth-iron-boron alloy magnet powder, each individual particle includes a recrystallized grain structure containing a R.sub.2 Fe.sub.14 B intermetallic compound phase as a principal phase thereof, wherein R represents a rare earth element. The intermetallic compound phase are formed of recrystallized grains of a tetragonal crystal structure having an average crystal grain size of 0.05 .mu.m to 50 .mu.m. For producing the above magnet powder, a rear earth-iron-boron alloy material is first prepared. Then, hydrogen is occluded inot the alloy material by holding the material at a temperature of 500.degree. C. to 1,000.degree. C. either in an atmosphere of hydrogen gas or in an atmosphere of hydrogen and inert gases. Subsequently, the alloy material is subjected to dehydrogenation at a temperature of 500.degree. C. to 1,000.degree. C. until the pressure of hydrogen in the atmosphere is decreased to no greater than 1.times.10.sup.-1 torr, and is subjected to cooling.Type: GrantFiled: June 6, 1990Date of Patent: May 5, 1992Assignee: Mitsubishi Materials CorporationInventors: Takuo Takeshita, Ryoji Nakayama, Tamotsu Ogawa
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Patent number: 4981532Abstract: In a rare earth-iron-boron alloy magnet powder, each individual particle includes a recrystallized grain structure containing a R.sub.2 Fe.sub.14 B intermetallic compound phase as a principal phase thereof, wherein R represents a rare earth element. The intermetallic compound phase are formed of recrystallized grains of a tetragonal crystal structure having an average crystal grain size of 0.05 .mu.m to 50 .mu.m. For producing the above magnet powder, a rear earth-iron-boron alloy material is first prepared. Then, hydrogen is occluded into the alloy material by holding the material at a temperature of 500.degree. C. to 1,000.degree. C. either in an atmosphere of hydrogen gas or in an atmosphere of hydrogen and inert gases. Subsequently, the alloy material is subjected to dehydrogenation at a temperature of 500.degree. C. to 1,000.degree. C. until the pressure of hydrogen in the atmosphere is decreased to no greater than 1.times.10.sup.-1 torr, and is subjected to cooling.Type: GrantFiled: August 19, 1988Date of Patent: January 1, 1991Assignee: Mitsubishi Kinzoku Kabushiki KaishaInventors: Takuo Takeshita, Ryoji Nakayama, Tamotsu Ogawa