Akio Tokumo

Person

Kawagoe, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Power amplifier apparatus
- Patent number 5,343,161
- Issue date Aug 30, 1994
- Pioneer Electronic Corporation
- Akio Tokumo
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Automatic level control circuit
- Patent number 5,043,676
- Issue date Aug 27, 1991
- Pioneer Electronic Corporation
- Takeshi Sato
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Pulse-width modulating amplifier circuit
- Patent number 4,992,749
- Issue date Feb 12, 1991
- Pioneer Electronic Corporation
- Akio Tokumo
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Sound field correction system
- Patent number 4,980,914
- Issue date Dec 25, 1990
- Pioneer Electronic Corporation
- Yoshiro Kunugi
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Pulse width modulation amplifier circuit
- Patent number 4,968,948
- Issue date Nov 6, 1990
- Pioneer Electronic Corporation
- Akio Tokumo
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Pulse width modulation amplifier circuit
- Patent number 4,952,884
- Issue date Aug 28, 1990
- Pioneer Electronic Corporation
- Akio Tokumo
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Pulse width modulation amplifier circuit
- Patent number 4,949,048
- Issue date Aug 14, 1990
- Pioneer Electronic Corporation
- Akio Tokumo
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Limiter circuit
- Patent number 4,928,071
- Issue date May 22, 1990
- Pioneer Electronic Corporation
- Hideo Yamamoto
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Sound field correction system
- Patent number 4,868,878
- Issue date Sep 19, 1989
- Pioneer Electronic Corporation
- Yoshiro Kunugi
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Method and apparatus for measuring and correcting acoustic characte...
- Patent number 4,739,513
- Issue date Apr 19, 1988
- Pioneer Electronic Corporation
- Yoshiro Kunugi
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Headrest-mounted acoustic device
- Patent number 4,696,370
- Issue date Sep 29, 1987
- Pioneer Electronic Corporation
- Akio Tokumo
- B60 - VEHICLES IN GENERAL
Information Patent Grant
Automatic sound field correcting system
- Patent number 4,694,498
- Issue date Sep 15, 1987
- Pioneer Electronic Corporation
- Shinichi Suzuki
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Mobile sound field correcting device
- Patent number 4,648,117
- Issue date Mar 3, 1987
- Pioneer Electronic Corporation
- Yoshiro Kunugi
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Automatic gain and frequency characteristic control unit in audio d...
- Patent number 4,644,292
- Issue date Feb 17, 1987
- Pioneer Electronic Corporation
- Yoshiro Kunugi
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Mobile sound field correcting device
- Patent number 4,622,691
- Issue date Nov 11, 1986
- Pioneer Electronic Corporation
- Akio Tokumo
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Voltage-controlled attenuator
- Patent number 4,496,860
- Issue date Jan 29, 1985
- Pioneer Electronic Corporation
- Akio Tokumo
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Automatic sound volume control device
- Patent number 4,476,571
- Issue date Oct 9, 1984
- Pioneer Electronic Corporation
- Akio Tokumo
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Differential amplifier
- Patent number 4,456,887
- Issue date Jun 26, 1984
- Pioneer Electronic Corporation
- Akio Tokumo
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Oscillator having capacitor charged and discharged by current mirro...
- Patent number 4,418,323
- Issue date Nov 29, 1983
- Pioneer Electronic Corporation
- Akio Tokumo
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Pulse width modulation amplifier
- Patent number 4,415,863
- Issue date Nov 15, 1983
- Pioneer Electronic Corporation
- Akio Tokumo
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Noise suppression system
- Patent number 4,258,329
- Issue date Mar 24, 1981
- Pioneer Electronic Corporation
- Akio Tokumo
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Akio Tokumo

Person

Patents Grantslast 30 patents

Power amplifier apparatus

Automatic level control circuit

Pulse-width modulating amplifier circuit

Sound field correction system

Pulse width modulation amplifier circuit

Pulse width modulation amplifier circuit

Pulse width modulation amplifier circuit

Limiter circuit

Sound field correction system

Method and apparatus for measuring and correcting acoustic characte...

Headrest-mounted acoustic device

Automatic sound field correcting system

Mobile sound field correcting device

Automatic gain and frequency characteristic control unit in audio d...

Mobile sound field correcting device

Voltage-controlled attenuator

Automatic sound volume control device

Differential amplifier

Oscillator having capacitor charged and discharged by current mirro...

Pulse width modulation amplifier

Noise suppression system