Masaakira Umehara

Person

Tokyo, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Optical information recording medium
- Patent number 5,196,250
- Issue date Mar 23, 1993
- Ricoh Company, Ltd.
- Michiharu Abe
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical information recording medium, information recording method...
- Patent number 5,002,812
- Issue date Mar 26, 1991
- Ricoh Company, Ltd.
- Masaakira Umehara
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical information recording element
- Patent number 4,891,305
- Issue date Jan 2, 1990
- Ricoh Co., Ltd.
- Hideaki Oba
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical information recording medium
- Patent number 4,767,693
- Issue date Aug 30, 1988
- Ricoh Co., Ltd.
- Hideaki Oba
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical information recording medium
- Patent number 4,758,499
- Issue date Jul 19, 1988
- Ricoh Co., Ltd.
- Michiharu Abe
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical information recording medium
- Patent number 4,714,667
- Issue date Dec 22, 1987
- Ricoh Co., Ltd.
- Tsutomu Sato
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical information recording medium
- Patent number 4,707,431
- Issue date Nov 17, 1987
- Ricoh Co., Ltd.
- Masaakira Umehara
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical information recording medium
- Patent number 4,696,892
- Issue date Sep 29, 1987
- Ricoh Co., Ltd.
- Michiharu Abe
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical information recording medium
- Patent number 4,656,121
- Issue date Apr 7, 1987
- Ricoh Co., Ltd.
- Tsutomu Sato
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical information recording medium
- Patent number 4,614,705
- Issue date Sep 30, 1986
- Ricoh Co., Ltd.
- Masaakira Umehara
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical information recording medium
- Patent number 4,477,555
- Issue date Oct 16, 1984
- Ricoh Co., Ltd.
- Hideaki Oba
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical information recording medium
- Patent number 4,465,767
- Issue date Aug 14, 1984
- Ricoh Company, Ltd.
- Hideaki Oba
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical information recording medium
- Patent number 4,460,665
- Issue date Jul 17, 1984
- Ricoh Co., Ltd.
- Makoto Kunikane
- G11 - INFORMATION STORAGE
Information Patent Grant
Photo-sensitive and heat-sensitive composition and recording elemen...
- Patent number 4,332,884
- Issue date Jun 1, 1982
- Ricoh Co., Ltd.
- Koji Uji-Ie
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Photo-sensitive and heat-sensitive composition and recording elemen...
- Patent number 4,315,068
- Issue date Feb 9, 1982
- Ricoh Co., Ltd.
- Makoto Kunikane
- B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
Information Patent Grant
Color electrostatic copying machine
- Patent number 4,162,843
- Issue date Jul 31, 1979
- Ricoh Company, Ltd.
- Satoru Inoue
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY

Masaakira Umehara

Person

Patents Grantslast 30 patents

Optical information recording medium

Optical information recording medium, information recording method...

Optical information recording element

Optical information recording medium

Optical information recording medium

Optical information recording medium

Optical information recording medium

Optical information recording medium

Optical information recording medium

Optical information recording medium

Optical information recording medium

Optical information recording medium

Optical information recording medium

Photo-sensitive and heat-sensitive composition and recording elemen...

Photo-sensitive and heat-sensitive composition and recording elemen...

Color electrostatic copying machine