Koji Hirakura

Person

Kanagawa, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Image forming apparatus
- Patent number 8,081,331
- Issue date Dec 20, 2011
- Ricoh Company, Ltd.
- Takuro Sekiya
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical scanning lens, optical scanning device and image forming ap...
- Patent number 7,072,127
- Issue date Jul 4, 2006
- Ricoh Company, Ltd.
- Hiroyuki Suhara
- G02 - OPTICS
Information Patent Grant
Optical scanning lens, optical scanning device and image forming ap...
- Patent number 6,870,652
- Issue date Mar 22, 2005
- Ricoh Company, Ltd.
- Hiroyuki Suhara
- G02 - OPTICS
Information Patent Grant
Optical scanning lens, optical scanning device and image forming ap...
- Patent number 6,744,545
- Issue date Jun 1, 2004
- Ricoh Company, Ltd.
- Hiroyuki Suhara
- G02 - OPTICS
Information Patent Grant
Optical scanning lens, optical scanning device and image forming ap...
- Patent number 6,400,391
- Issue date Jun 4, 2002
- Ricoh Company, Ltd.
- Hiroyuki Suhara
- B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
Information Patent Grant
Developing unit of dry type
- Patent number 4,700,659
- Issue date Oct 20, 1987
- Ricoh Co., Ltd.
- Koji Hirakura
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Process of exposing photosensitive member
- Patent number 4,487,501
- Issue date Dec 11, 1984
- Ricoh Company, Ltd.
- Shigeru Suzuki
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Transfer medium separating device
- Patent number 4,408,863
- Issue date Oct 11, 1983
- Ricoh Company, Ltd.
- Yoshihiro Ogata
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Toner concentration control apparatus
- Patent number 4,389,972
- Issue date Jun 28, 1983
- Ricoh Company, Ltd.
- Koji Hirakura
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Toner concentration control apparatus
- Patent number 4,369,733
- Issue date Jan 25, 1983
- Ricoh Company, Ltd.
- Koji Hirakura
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Electrostatic copying apparatus
- Patent number 4,367,032
- Issue date Jan 4, 1983
- Ricoh Company, Ltd.
- Koji Sakamoto
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Toner image transfer method and apparatus for electrostatic photogr...
- Patent number 4,268,157
- Issue date May 19, 1981
- Ricoh Company, Ltd.
- Yutaka Ebi
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Toner developing ability measuring system for electrostatography
- Patent number 4,266,141
- Issue date May 5, 1981
- Ricoh Company, Ltd.
- Koji Hirakura
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Toner composition for multiple copy electrostatic photography
- Patent number 4,242,434
- Issue date Dec 30, 1980
- Ricoh Company, Ltd.
- Koji Hirakura
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Electrostatic copying method for forming multiple copies
- Patent number 4,172,722
- Issue date Oct 30, 1979
- Ricoh Co., Ltd.
- Koji Hirakura
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY

Patents Applicationslast 30 patents

Information Patent Application
Image forming apparatus
- Publication number 20060192992
- Publication date Aug 31, 2006
- Takuro Sekiya
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Multifunction display device
- Publication number 20060022910
- Publication date Feb 2, 2006
- Takuro Sekiya
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Application
Optical scanning lens, optical scanning device and image forming ap...
- Publication number 20050128615
- Publication date Jun 16, 2005
- Hiroyuki Suhara
- G02 - OPTICS
Information Patent Application
Optical scanning lens, optical scanning device and image forming ap...
- Publication number 20040196520
- Publication date Oct 7, 2004
- Hiroyuki Suhara
- G02 - OPTICS
Information Patent Application
Optical scanning lens, optical scanning device and image forming ap...
- Publication number 20020163571
- Publication date Nov 7, 2002
- Hiroyuki Suhara
- B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS

Koji Hirakura

Person

Patents Grantslast 30 patents

Image forming apparatus

Optical scanning lens, optical scanning device and image forming ap...

Optical scanning lens, optical scanning device and image forming ap...

Optical scanning lens, optical scanning device and image forming ap...

Optical scanning lens, optical scanning device and image forming ap...

Developing unit of dry type

Process of exposing photosensitive member

Transfer medium separating device

Toner concentration control apparatus

Toner concentration control apparatus

Electrostatic copying apparatus

Toner image transfer method and apparatus for electrostatic photogr...

Toner developing ability measuring system for electrostatography

Toner composition for multiple copy electrostatic photography

Electrostatic copying method for forming multiple copies

Patents Applicationslast 30 patents

Image forming apparatus

Multifunction display device

Optical scanning lens, optical scanning device and image forming ap...

Optical scanning lens, optical scanning device and image forming ap...

Optical scanning lens, optical scanning device and image forming ap...