Masao Yoshikawa

Person

Machida, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Electrophotographic photoreceptor and electrophotographic image for...
- Patent number 6,521,386
- Issue date Feb 18, 2003
- Ricoh Company Ltd.
- Yohta Sakon
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Sealing agent for liquid crystal display and liquid crystal display...
- Patent number 6,379,759
- Issue date Apr 30, 2002
- Ricoh Company, Ltd.
- Sumio Kamoi
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Positively-chargeable single-layered type electrophotographic photo...
- Patent number 5,492,784
- Issue date Feb 20, 1996
- Ricoh Company, Ltd.
- Masao Yoshikawa
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Electrophotographic photoconductor
- Patent number 5,486,438
- Issue date Jan 23, 1996
- Ricoh Company, Ltd.
- Masayuki Shoshi
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Electrophotographic photoconductor
- Patent number 5,387,487
- Issue date Feb 7, 1995
- Ricoh Company, Ltd.
- Masayuki Shoshi
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Electrophotographic photoconductor
- Patent number 5,350,653
- Issue date Sep 27, 1994
- Ricoh Company, Ltd.
- Masayuki Shoshi
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Organic photovoltaic element
- Patent number 5,350,459
- Issue date Sep 27, 1994
- Ricoh Company, Ltd.
- Tetsuro Suzuki
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
High dielectric polymeric optical recording medium
- Patent number 5,326,678
- Issue date Jul 5, 1994
- Ricoh Company Ltd.
- Akio Kojima
- G11 - INFORMATION STORAGE
Information Patent Grant
Photoelectric conversion device
- Patent number 5,264,048
- Issue date Nov 23, 1993
- Ricoh Company, Ltd.
- Masao Yoshikawa
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Photovoltaic device containing organic material layers and having h...
- Patent number 5,201,961
- Issue date Apr 13, 1993
- Ricoh Company, Ltd.
- Masao Yoshikawa
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Electric device
- Patent number 5,126,802
- Issue date Jun 30, 1992
- Ricoh Company, Ltd.
- Masao Yoshikawa
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Electric device and photoelectric conversion device comprising the...
- Patent number 5,006,915
- Issue date Apr 9, 1991
- Ricoh Company, Ltd.
- Masao Yoshikawa
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Photoelectric conversion element
- Patent number 4,992,109
- Issue date Feb 12, 1991
- Ricoh Company, Ltd.
- Masao Yoshikawa
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
N,N'-diphenylbenzidine polymer and method of producing the same
- Patent number 4,874,481
- Issue date Oct 17, 1989
- Ricoh Company, Ltd.
- Tetsuro Suzuki
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Photoelectric transducer element
- Patent number 4,672,149
- Issue date Jun 9, 1987
- Ricoh Co., Ltd.
- Masao Yoshikawa
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Copying method and apparatus
- Patent number 4,413,899
- Issue date Nov 8, 1983
- Ricoh Company, Ltd.
- Shuichi Karasawa
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Methods for preparing plural layer organic electrophotographic elem...
- Patent number 4,329,416
- Issue date May 11, 1982
- Ricoh Co., Ltd.
- Kiyoshi Tanikawa
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY

Patents Applicationslast 30 patents

Information Patent Application
SEALING AGENT FOR LIQUID CRYSTAL DISPLAY AND LIQUID CRYSTAL DEISPLA...
- Publication number 20010053426
- Publication date Dec 20, 2001
- SUMIO KAMOI
- G02 - OPTICS

Masao Yoshikawa

Person

Patents Grantslast 30 patents

Electrophotographic photoreceptor and electrophotographic image for...

Sealing agent for liquid crystal display and liquid crystal display...

Positively-chargeable single-layered type electrophotographic photo...

Electrophotographic photoconductor

Electrophotographic photoconductor

Electrophotographic photoconductor

Organic photovoltaic element

High dielectric polymeric optical recording medium

Photoelectric conversion device

Photovoltaic device containing organic material layers and having h...

Electric device

Electric device and photoelectric conversion device comprising the...

Photoelectric conversion element

N,N'-diphenylbenzidine polymer and method of producing the same

Photoelectric transducer element

Copying method and apparatus

Methods for preparing plural layer organic electrophotographic elem...

Patents Applicationslast 30 patents

SEALING AGENT FOR LIQUID CRYSTAL DISPLAY AND LIQUID CRYSTAL DEISPLA...