Masao Yoshikawa

Person

Tokyo, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Image forming apparatus employing non-magnetic and magnetic toner
- Patent number 4,937,630
- Issue date Jun 26, 1990
- Canon Kabushiki Kaisha
- Masao Yoshikawa
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Process cartridge and multi-color image forming apparatus using same
- Patent number 4,924,267
- Issue date May 8, 1990
- Canon Kabushiki Kaisha
- Masao Yoshikawa
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Image forming apparatus
- Patent number 4,887,102
- Issue date Dec 12, 1989
- Canon Kabushiki Kaisha
- Masao Yoshikawa
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Magnet roll developing apparatus
- Patent number 4,872,418
- Issue date Oct 10, 1989
- Canon Kabushiki Kaisha
- Masao Yoshikawa
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Electrophotographic apparatus capable of forming images in differen...
- Patent number 4,831,408
- Issue date May 16, 1989
- Canon Kabushiki Kaisha
- Masao Yoshikawa
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Image forming apparatus with plural developing devices
- Patent number 4,774,543
- Issue date Sep 27, 1988
- Canon Kabushiki Kaisha
- Masao Yoshikawa
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Method for forming a thin layer of developer
- Patent number 4,606,990
- Issue date Aug 19, 1986
- Canon Kabushiki Kaisha
- Masao Yoshikawa
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Device for forming a thin layer of developer
- Patent number 4,548,489
- Issue date Oct 22, 1985
- Canon Kabushiki Kaisha
- Masao Yoshikawa
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Magnetic developing device with offset magnetic pole
- Patent number 4,504,136
- Issue date Mar 12, 1985
- Canon Kabushiki Kaisha
- Masao Yoshikawa
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY

Masao Yoshikawa

Person

Patents Grantslast 30 patents

Image forming apparatus employing non-magnetic and magnetic toner

Process cartridge and multi-color image forming apparatus using same

Image forming apparatus

Magnet roll developing apparatus

Electrophotographic apparatus capable of forming images in differen...

Image forming apparatus with plural developing devices

Method for forming a thin layer of developer

Device for forming a thin layer of developer

Magnetic developing device with offset magnetic pole