Seiichi Ishikawa

Person

Kadoma, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Thin speaker having an enclosure with an open portion and a closed...
- Patent number 5,073,946
- Issue date Dec 17, 1991
- Matsushita Electric Industrial Co., Ltd.
- Katsuaki Satoh
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Method and apparatus for calculating filter factors
- Patent number 5,051,942
- Issue date Sep 24, 1991
- Matsushita Electric Industrial Co., Ltd.
- Masaharu Matsumoto
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Apparatus for changing a sound field
- Patent number 5,023,913
- Issue date Jun 11, 1991
- Matsushita Electric Industrial Co., Ltd.
- Masaharu Matsumoto
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Thin speaker having an enclosure within an open portion and a close...
- Patent number 4,899,390
- Issue date Feb 6, 1990
- Matsushita Electric Industrial Co., Ltd.
- Hiroyuki Takewa
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Calculation of filter factors for digital filter
- Patent number 4,896,285
- Issue date Jan 23, 1990
- Matsushita Electric Industrial Co., Ltd.
- Seiichi Ishikawa
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Digital equalizer apparatus enabling separate phase and amplitude c...
- Patent number 4,888,808
- Issue date Dec 19, 1989
- Matsushita Electric Industrial Co., Ltd.
- Seiichi Ishikawa
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Method of manufacturing a speaker diaphragm
- Patent number 4,484,383
- Issue date Nov 27, 1984
- Matsushita Electric Industrial Co., Ltd.
- Hiroyuki Takewa
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Electrodynamic loudspeaker
- Patent number 4,426,556
- Issue date Jan 17, 1984
- Matsushita Electric Industrial Co., Ltd.
- Shuji Saiki
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Seiichi Ishikawa

Person

Patents Grantslast 30 patents

Thin speaker having an enclosure with an open portion and a closed...

Method and apparatus for calculating filter factors

Apparatus for changing a sound field

Thin speaker having an enclosure within an open portion and a close...

Calculation of filter factors for digital filter

Digital equalizer apparatus enabling separate phase and amplitude c...

Method of manufacturing a speaker diaphragm

Electrodynamic loudspeaker