Hirotaka Yokoyama

Person

Yokosuka, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Magnetic recording medium and a method for producing the same where...
- Patent number 5,494,732
- Issue date Feb 27, 1996
- Kabushiki Kaisha Toshiba
- Takeo Ito
- G11 - INFORMATION STORAGE
Information Patent Grant
Magnetic recording medium and a method for producing the same where...
- Patent number 5,384,182
- Issue date Jan 24, 1995
- Kabushiki Kaisha Toshiba
- Takeo Ito
- G11 - INFORMATION STORAGE
Information Patent Grant
Magnetic recording medium containing a substituted hexagonal ferrit...
- Patent number 5,077,146
- Issue date Dec 31, 1991
- Kabushiki Kaisha Toshiba
- Osamu Kubo
- G11 - INFORMATION STORAGE
Information Patent Grant
Magnetic recording powder, method of manufacturing thereof and appl...
- Patent number 4,837,092
- Issue date Jun 6, 1989
- Kabushiki Kaisha Toshiba
- Hirotaka Yokoyama
- G11 - INFORMATION STORAGE
Information Patent Grant
Magnetic recording powder, method of manufacturing thereof and appl...
- Patent number 4,699,771
- Issue date Oct 13, 1987
- Kabushiki Kaisha Toshiba
- Hirotaka Yokoyama
- G11 - INFORMATION STORAGE
Information Patent Grant
Magnetic powders for magnetic recording media and magnetic recordin...
- Patent number 4,636,433
- Issue date Jan 13, 1987
- Kabushiki Kaisha Toshiba
- Osamu Kubo
- C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information Patent Grant
Method and apparatus for perpendicular magnetic recording medium
- Patent number 4,447,467
- Issue date May 8, 1984
- Tokyo Shibaura Denki Kabushiki Kaisha
- Toshihiko Oguchi
- G11 - INFORMATION STORAGE
Information Patent Grant
Magnetic recording media
- Patent number 4,425,401
- Issue date Jan 10, 1984
- Tokyo Shibaura Denki Kabushiki Kaisha
- Tadashi Ido
- G11 - INFORMATION STORAGE

Hirotaka Yokoyama

Person

Patents Grantslast 30 patents

Magnetic recording medium and a method for producing the same where...

Magnetic recording medium and a method for producing the same where...

Magnetic recording medium containing a substituted hexagonal ferrit...

Magnetic recording powder, method of manufacturing thereof and appl...

Magnetic recording powder, method of manufacturing thereof and appl...

Magnetic powders for magnetic recording media and magnetic recordin...

Method and apparatus for perpendicular magnetic recording medium

Magnetic recording media