Hiroyuki Ishikawa

Person

Kyoto-shi, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Driving circuit for light emitting element, light emitting device u...
- Patent number 10,152,926
- Issue date Dec 11, 2018
- Rohm Co., Ltd.
- Hiroyuki Ishikawa
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
Information Patent Grant
Driving circuit for light emitting diode
- Patent number 8,730,228
- Issue date May 20, 2014
- Rohm Co., Ltd.
- Masao Yonemaru
- H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Driving circuit for light emitting diode
- Patent number 8,552,971
- Issue date Oct 8, 2013
- Rohm Co., Ltd.
- Hiroyuki Ishikawa
- H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Battery charging method, battery charging circuit, and portable ele...
- Patent number 6,967,469
- Issue date Nov 22, 2005
- ROHM Co, Ltd.
- Isao Yamamoto
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Stabilized power supply unit having a current limiting function
- Patent number 6,897,638
- Issue date May 24, 2005
- Rohm Co., Ltd.
- Koichi Miyanaga
- G05 - CONTROLLING REGULATING
Information Patent Grant
Stabilized power supply unit having a current limiting function
- Patent number 6,822,428
- Issue date Nov 23, 2004
- Rohm Co., Ltd.
- Koichi Miyanaga
- G05 - CONTROLLING REGULATING
Information Patent Grant
EL element driving circuit and EL element lighting device using the...
- Patent number 5,886,475
- Issue date Mar 23, 1999
- Rohm Co., Ltd.
- Sachito Horiuchi
- H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
Information Patent Grant
DC/DC converter and audio device incorporating the same
- Patent number 5,565,762
- Issue date Oct 15, 1996
- Rohm Co., Ltd.
- Hiroyuki Ishikawa
- G05 - CONTROLLING REGULATING

Patents Applicationslast 30 patents

Information Patent Application
DRIVING CIRCUIT FOR LIGHT EMITTING ELEMENT, LIGHT EMITTING DEVICE U...
- Publication number 20130038819
- Publication date Feb 14, 2013
- Rohm Co., Ltd.
- Hiroyuki Ishikawa
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
Information Patent Application
Driving circuit for light emitting diode
- Publication number 20110128303
- Publication date Jun 2, 2011
- Rohm Co., Ltd.
- Masao Yonemaru
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
Information Patent Application
DRIVING CIRCUIT FOR LIGHT EMITTING DIODE
- Publication number 20110018914
- Publication date Jan 27, 2011
- Rohm Co., Ltd.
- Hiroyuki Ishikawa
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
Information Patent Application
Power supply apparatus using synchronous rectified step-down converter
- Publication number 20060001410
- Publication date Jan 5, 2006
- Hiroyuki Ishikawa
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information Patent Application
Battery charging method, battery charging circuit, and portable ele...
- Publication number 20040095095
- Publication date May 20, 2004
- ROHM CO., LTD.
- Isao Yamamoto
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Application
Semiconductor device having voltage feedback circuit therein, and e...
- Publication number 20040075488
- Publication date Apr 22, 2004
- Isao yamamoto
- G05 - CONTROLLING REGULATING
Information Patent Application
Stabilized power supply unit having a current limiting function
- Publication number 20040004466
- Publication date Jan 8, 2004
- ROHM CO., LTD.
- Koichi Miyanaga
- G05 - CONTROLLING REGULATING
Information Patent Application
Stabilized power supply unit having a current limiting function
- Publication number 20040004467
- Publication date Jan 8, 2004
- ROHM CO., LTD.
- Koichi Miyanaga
- G05 - CONTROLLING REGULATING

Hiroyuki Ishikawa

Person

Patents Grantslast 30 patents

Driving circuit for light emitting element, light emitting device u...

Driving circuit for light emitting diode

Driving circuit for light emitting diode

Battery charging method, battery charging circuit, and portable ele...

Stabilized power supply unit having a current limiting function

Stabilized power supply unit having a current limiting function

EL element driving circuit and EL element lighting device using the...

DC/DC converter and audio device incorporating the same

Patents Applicationslast 30 patents

DRIVING CIRCUIT FOR LIGHT EMITTING ELEMENT, LIGHT EMITTING DEVICE U...

Driving circuit for light emitting diode

DRIVING CIRCUIT FOR LIGHT EMITTING DIODE

Power supply apparatus using synchronous rectified step-down converter

Battery charging method, battery charging circuit, and portable ele...

Semiconductor device having voltage feedback circuit therein, and e...

Stabilized power supply unit having a current limiting function

Stabilized power supply unit having a current limiting function