Yamagiwa; Tokio

Patent Applications and Registrations

Patent applications and USPTO patent grants for Yamagiwa; Tokio.The latest application filed is for "insulated device diagnosing system and partial discharge detecting method".

Company Profile

0.17.3

Yamagiwa; Tokio - Hitachi JP
Yamagiwa, Tokio - Hitachi-shi JP

*profile and listings may contain filings by different individuals or companies with the same name. Review application materials to confirm ownership/assignment.

Patent Activity

Patent	Date
Gas insulation switch Grant 6,538,877 - Yamagiwa , et al. March 25, 2	2003-03-25
Insulated device diagnosing system and partial discharge detecting method App 20020163344 - Rokunohe, Toshiaki ; et al.	2002-11-07
Gas insulation switch App 20020071242 - Yamagiwa, Tokio ; et al.	2002-06-13
Gas insulation switch App 20020008958 - Yamagiwa, Tokio ; et al.	2002-01-24
Gas insulation switch Grant 6,292,356 - Yamagiwa , et al. September 18, 2	2001-09-18
Bushing Grant 6,218,627 - Shindo , et al. April 17, 2	2001-04-17
Optical pressure detection method and apparatus Grant 5,929,989 - Mori , et al. July 27, 1	1999-07-27
Enclosed electric conductor arrangement Grant 5,798,484 - Yamagiwa , et al. August 25, 1	1998-08-25
Long-sized tubular grounding container unit for gas-insulated electrical device and laser welding device for manufacturing the same Grant 5,601,735 - Kawamoto , et al. February 11, 1	1997-02-11
Method of configuring a neural network and a diagnosis/recognition system using the same Grant 5,598,509 - Takahashi , et al. January 28, 1	1997-01-28
Electrical power supply system Grant 5,473,494 - Kurosawa , et al. December 5, 1	1995-12-05
Method of and device for protecting electrical power system Grant 5,305,174 - Morita , et al. April 19, 1	1994-04-19
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 Grant 5,256,976 - Ishikawa , et al. October 26, 1	1993-10-26
Apparatus and method for diagnosis of power appliances Grant 5,253,180 - Yamagiwa , et al. October 12, 1	1993-10-12
Abnormality diagnosing system and method for a high voltage power apparatus Grant 5,214,595 - Ozawa , et al. May 25, 1	1993-05-25
Abnormality diagnosing system and method for a high voltage power apparatus Grant 5,107,447 - Ozawa , et al. April 21, 1	1992-04-21
Contact abnormality detecting system Grant 4,975,800 - Oshita , et al. December 4, 1	1990-12-04
Insulation testing device for gas insulated apparatus Grant 4,829,256 - Yamagiwa , et al. May 9, 1	1989-05-09
Gas-insulated electrical apparatus with electret for captivating conductive particles and method of removing such particles during assembly thereof Grant 4,564,721 - Ishikawa , et al. January 14, 1	1986-01-14
Disc ceramic capacitor Grant 4,306,274 - Yamagiwa , et al. December 15, 1	1981-12-15

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