Kenji Yokoyama

Person

Hamamatsu, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Snubber circuit for a switching power source
- Patent number 5,880,943
- Issue date Mar 9, 1999
- Yamaha Corporation
- Kenji Yokoyama
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Switching power supply circuit
- Patent number 5,838,556
- Issue date Nov 17, 1998
- Yamaha Corporation
- Kenji Yokoyama
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Switching power circuit with current resonance for zero current swi...
- Patent number 5,751,560
- Issue date May 12, 1998
- Yamaha Corporation
- Kenji Yokoyama
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Power source adaptor
- Patent number 5,712,515
- Issue date Jan 27, 1998
- Yamaha Corporation
- Yokoyama Kenji
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Self exciting type switching power supply circuit
- Patent number 5,515,256
- Issue date May 7, 1996
- Yamaha Corporation
- Kenji Yokoyama
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Acoustic apparatus and driving apparatus constituting the same
- Patent number 5,280,543
- Issue date Jan 18, 1994
- Yamaha Corporation
- Kenji Yokoyama
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Acoustic apparatus
- Patent number 5,191,616
- Issue date Mar 2, 1993
- Yamaha Corporation
- Kenji Yokoyama
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Switching regulated DC-DC converter using variable capacity diodes...
- Patent number 5,140,513
- Issue date Aug 18, 1992
- Yamaha Corporation
- Kenji Yokoyama
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Vibration control for an optical pickup actuator driving device
- Patent number 5,138,593
- Issue date Aug 11, 1992
- Yamaha Corporation
- Kenji Yokoyama
- G11 - INFORMATION STORAGE
Information Patent Grant
Dynamic loudspeaker driving apparatus
- Patent number 5,031,221
- Issue date Jul 9, 1991
- Yamaha Corporation
- Kenji Yokoyama
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Analog type magnetic recording and reproducing device with digital...
- Patent number 5,027,228
- Issue date Jun 25, 1991
- Yamaha Corporation
- Kenji Yokoyama
- G11 - INFORMATION STORAGE
Information Patent Grant
Acoustic apparatus
- Patent number 5,009,280
- Issue date Apr 23, 1991
- Yamaha Corporation
- Kenji Yokoyama
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Acoustic apparatus
- Patent number 5,009,281
- Issue date Apr 23, 1991
- Yamaha Corporation
- Kenji Yokoyama
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Acoustic apparatus
- Patent number 4,989,187
- Issue date Jan 29, 1991
- Yamaha Corporation
- Kenji Yokoyama
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Acoustic apparatus
- Patent number 4,987,564
- Issue date Jan 22, 1991
- Yamaha Corporation
- Kenji Yokoyama
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
DC-to-DC voltage-increasing power source
- Patent number 4,908,752
- Issue date Mar 13, 1990
- Yamaha Corporation
- Eiichi Suzuki
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Sample hold circuit
- Patent number 4,801,823
- Issue date Jan 31, 1989
- Nippon Gakki Seizo Kabushiki Kaisha
- Kenji Yokoyama
- G11 - INFORMATION STORAGE
Information Patent Grant
Power amplifier circuit for an audio circuit
- Patent number 4,785,257
- Issue date Nov 15, 1988
- Nippon Gakki Seizo Kabushiki Kaisha
- Kenji Yokoyama
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Gain-controlled amplifier
- Patent number 4,727,335
- Issue date Feb 23, 1988
- Nippon Gakki Seizo Kabushiki Kaisha
- Kenji Yokoyama
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Gain-controlled amplifier
- Patent number 4,724,398
- Issue date Feb 9, 1988
- Nippon Gakki Seizo Kabushiki Kaisha
- Kenji Yokoyama
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Device for forming a simulated stereophonic sound field
- Patent number 4,653,096
- Issue date Mar 24, 1987
- Nippon Gakki Seizo Kabushiki Kaisha
- Kenji Yokoyama
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Multiplex stereo demodulator
- Patent number 4,651,106
- Issue date Mar 17, 1987
- Nippon Gakki Seizo Kabushiki Kaisha
- Kenji Yokoyama
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Amplifier circuit with distortion cancellation function
- Patent number 4,571,553
- Issue date Feb 18, 1986
- Nippon Gakki Seizo Kabushiki Kaisha
- Kenji Yokoyama
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Variable resistance circuit
- Patent number 4,568,840
- Issue date Feb 4, 1986
- Nippon Gakki Seizo Kabushiki Kaisha
- Yokoyama Kenji
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Power amplifier
- Patent number 4,560,946
- Issue date Dec 24, 1985
- Nippon Gakki Seizo Kabushiki Kaisha
- Kenji Yokoyama
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Pulse-width modulation circuit
- Patent number 4,531,096
- Issue date Jul 23, 1985
- Nippon Gakki Seizo Kabushiki Kaisha
- Kenji Yokoyama
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Pulse-width modulation circuit with carrier signal frequency control
- Patent number 4,524,335
- Issue date Jun 18, 1985
- Nippon Gakki Seizo Kabushiki Kaisha
- Kenji Yokoyama
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Small signal amplifying circuit for a pickup cartridge
- Patent number 4,512,008
- Issue date Apr 16, 1985
- Nippon Gakki Seizo Kabushiki Kaisha
- Kenji Yokoyama
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Protection circuit for switching power amplifier
- Patent number 4,509,101
- Issue date Apr 2, 1985
- Nippon Gakki Seizo Kabushiki Kaisha
- Yokoyama Kenji
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Pulse-width modulation circuit
- Patent number 4,504,793
- Issue date Mar 12, 1985
- Nippon Gakki Seizo Kabushiki Kaisha
- Kenji Yokoyama
- H03 - BASIC ELECTRONIC CIRCUITRY

Kenji Yokoyama

Person

Patents Grantslast 30 patents

Snubber circuit for a switching power source

Switching power supply circuit

Switching power circuit with current resonance for zero current swi...

Power source adaptor

Self exciting type switching power supply circuit

Acoustic apparatus and driving apparatus constituting the same

Acoustic apparatus

Switching regulated DC-DC converter using variable capacity diodes...

Vibration control for an optical pickup actuator driving device

Dynamic loudspeaker driving apparatus

Analog type magnetic recording and reproducing device with digital...

Acoustic apparatus

Acoustic apparatus

Acoustic apparatus

Acoustic apparatus

DC-to-DC voltage-increasing power source

Sample hold circuit

Power amplifier circuit for an audio circuit

Gain-controlled amplifier

Gain-controlled amplifier

Device for forming a simulated stereophonic sound field

Multiplex stereo demodulator

Amplifier circuit with distortion cancellation function

Variable resistance circuit

Power amplifier

Pulse-width modulation circuit

Pulse-width modulation circuit with carrier signal frequency control

Small signal amplifying circuit for a pickup cartridge

Protection circuit for switching power amplifier

Pulse-width modulation circuit