Issued Patents All Time
Showing 1–25 of 31 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7388384 | Method and system for monitoring partial discharge in gas-insulated apparatus | Tatsuro Kato, Tomohiro Moriyama | 2008-06-17 |
| 7256584 | Method and system for measuring partial discharge | Tomohiro Moriyama, Tatsuro Kato, Toshiaki Rokunohe, Ryoichi Shinohara | 2007-08-14 |
| 7193172 | Gas-insulated switchgear tank | Toshiaki Rokunohe, Yoshitaka Yagihashi, Tomoaki Utsumi, Shunji Ito, Takashi Omori | 2007-03-20 |
| 7064267 | Gas insulating apparatus and method for locating fault point thereof | Tatsuro Kato, Tomoaki Utsumi, Kazuo Kobayashi, Kazuhiro Saito | 2006-06-20 |
| 7027280 | Gas insulating apparatus and method for locating fault point thereof | Tatsuro Kato, Tomoaki Utsumi, Kazuo Kobayashi, Kazuhiro Saito | 2006-04-11 |
| 6853528 | Gas insulating apparatus and method for locating fault point thereof | Tatsuro Kato, Tomoaki Utsumi, Kazuo Kobayashi, Kazuhiro Saito | 2005-02-08 |
| 6850399 | Gas insulated device and failure rating method | Tatsuro Kato, Tomoaki Utsumi, Kazuo Kobayashi, Kazuhiro Saito | 2005-02-01 |
| 6759616 | Gas insulated switchgear | Toshiaki Rokunohe, Kenji Tsuchiya, Toyokazu Tanaka | 2004-07-06 |
| 6680453 | Gas insulated switchgear | Toshiaki Rokunohe, Kenji Tsuchiya, Toyokazu Tanaka | 2004-01-20 |
| 6483316 | Method of diagnosing partial discharge in gas-insulated apparatus and partial discharge diagnosing system for carrying out the same | Tatsuro Kato | 2002-11-19 |
| 6424162 | Insulated device diagnosing system that prepares detection data from partial discharge signal such that periodic elements are given to different specific frequencies of the partial discharge signal | Toshiaki Rokunohe, Tokio Yamagiwa, Ryouichi Shinohara | 2002-07-23 |
| 6300768 | Method of diagnosing partial discharge in gas-insulated apparatus and partial discharge diagnosing system for carrying out the same | Tatsuro Kato | 2001-10-09 |
| 6218627 | Bushing | Katsuji Shindo, Toshiaki Rokunohe, Tokio Yamagiwa | 2001-04-17 |
| 6063997 | Gas insulated electric apparatus | Tomoaki Utsumi, Toshio Ishikawa, Shuzo Iwaasa, Tokio Yamagiwa | 2000-05-16 |
| 6002085 | Gas insulated switchgear | Tomoaki Utsumi, Toshio Ishikawa, Shuzo Iwaasa, Tokio Yamagiwa | 1999-12-14 |
| 5982181 | Insulated device diagnosing system for diagnosing device based upon partial discharge signal data analyzed by frequency | Toshiaki Rokunohe, Tokio Yamagiwa, Ryouichi Shinohara | 1999-11-09 |
| 5798484 | Enclosed electric conductor arrangement | Tokio Yamagiwa, Kazutoshi Asano | 1998-08-25 |
| 5728989 | Insulation gas filled circuit breaker | Tomoaki Utsumi, Takuya Sugawara, Goro Daimon, Kenji Tsuchiya | 1998-03-17 |
| 5689088 | Gas insulated device, gas insulated switchgear, gas insulated bus line, and cable direct-coupled gas insulated switchgear | Toshiaki Rokunohe, Tokio Yamagiwa, Kenji Anno | 1997-11-18 |
| 5627941 | Method of configuring a neural network and a diagnosis/control system using the neural network | Isao Takahashi, Tokio Yamagiwa | 1997-05-06 |
| 5598509 | Method of configuring a neural network and a diagnosis/recognition system using the same | Isao Takahashi, Tokio Yamagiwa | 1997-01-28 |
| 5274205 | Gas blast, puffer type circuit breaker with improved nozzle | Masanori Tsukushi, Akira Hashimoto, Minori Satoh, Yukio Kurosawa, Kunio Hirasawa +1 more | 1993-12-28 |
| 5256976 | Power apparatus and method of location of a fault in a power apparatus on the basis of attenuation coefficients of electromagnetic coefficients of fault generated electromagnetic waves | Toshio Ishikawa, Shuzo Iwaasa, Tomoaki Utsumi, Tokio Yamagiwa, Yoshinori Tagawa | 1993-10-26 |
| 5214595 | Abnormality diagnosing system and method for a high voltage power apparatus | Jun Ozawa, Youichi Ohshita, Izumi Yamada, Tokio Yamagiwa, Hiroshi Yamada +2 more | 1993-05-25 |
| 5146170 | Method and apparatus for locating an abnormality in a gas-insulated electric device | Toshio Ishikawa, Shuzuo Iwaasa, Tomoaki Utsumi | 1992-09-08 |