Inventor

Hiromitsu Hirayama

Inventor

Tokyo, JP

Overview

10→

Patents

1982–1999

Patent span

Electricity

Primary field (CPC H)

Patents· 10 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

H03Kprimary

H03KPulse technique29%

H02MApparatus for conversion between ac and ac, between ac and dc, or between dc and dc, and for use with mains or similar power supply systems14%

B05BSpraying apparatus7%

B06BMethods or apparatus for generating or transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency, e.g. for performing mechanical work in general7%

H01FMagnets7%

H01SDevices using the process of light amplification by stimulated emission of radiation [laser] to amplify or generate light7%

H05BElectric heating7%

H10DInorganic electric semiconductor devices7%

Y02BClimate change mitigation technologies related to buildings, e.g. housing, house appliances or related end-user applications7%

Y02PClimate change mitigation technologies in the production or processing of goods7%

PatentTitleYear

5,856,917'Electric power device with improved power factor'1999 5,323,071'Semiconductor integrated circuit device having logic level conversion circuit'1994 5,107,144'Integrated circuit having field effect transistors'1992 5,015,873'Semiconductor driver for producing switching and offset signals'1991 4,939,402'Driving circuit for driving a piezoelectric vibrator'1990 4,857,975'GaAs field effect transistor having a WSi Schottky gate electrode improved for high-speed operation'1989 4,850,534'Ultrasonic wave nebulizer'1989 4,743,957'Logic integrated circuit device formed on compound semiconductor substrate'1988 4,547,705'Discharge lamp lightening device'1985 4,327,348'Variable leakage transformer'1982

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1982Patents assigned to TDK ELECTRONICS CO LTD (1)· patent assignee history

1982–1990Based in Funabashi, JP· patent location history

1985–1999Patents assigned to TDK CORP (4)· patent assignee history

1985–1999Based in Tokyo, JP· patent location history

1988–1994Patents assigned to NEC CORP (5)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
NEC CORP	5	1988–1994
TDK CORP	4	1985–1999
TDK ELECTRONICS CO LTD	1	1982

Locations

Location	Patents	Span
Tokyo, JP	7	1985–1999
Funabashi, JP	3	1982–1990