Hiroaki Koyanagi

Person

Katsuta, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Recording/reproducing separation type magnetic head
- Patent number RE37785
- Issue date Jul 9, 2002
- Hitachi, Ltd.
- Yukio Sasada
- 360 - Dynamic magnetic information storage or retrieval
Information Patent Grant
Method of fabricating a magnetoresistive thin-film magnetic head
- Patent number 5,897,969
- Issue date Apr 27, 1999
- Hitachi, Ltd.
- Akira Taniyama
- G11 - INFORMATION STORAGE
Information Patent Grant
Recording/reproducing separation type magnetic head
- Patent number 5,894,380
- Issue date Apr 13, 1999
- Hitachi, Ltd.
- Yukio Sasada
- G11 - INFORMATION STORAGE
Information Patent Grant
Personal information display system for serving large capacities of...
- Patent number 5,721,942
- Issue date Feb 24, 1998
- Hitachi Maxell, Ltd.
- Nobumasa Nishiyama
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Magnetoresistive thin-film magnetic head and method of fabrication...
- Patent number 5,701,221
- Issue date Dec 23, 1997
- Hitachi, Ltd.
- Akira Taniyama
- G11 - INFORMATION STORAGE
Information Patent Grant
Thin film magnetoresistive head which includes a domain suppressing...
- Patent number 5,471,358
- Issue date Nov 28, 1995
- Hitachi, Ltd.
- Shigeru Tadokoro
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical memory medium and its information recording and erasing met...
- Patent number 5,177,717
- Issue date Jan 5, 1993
- Hitachi, Ltd.
- Yoshio Sato
- G11 - INFORMATION STORAGE
Information Patent Grant
Method and apparatus of optical modulation using superconductive ox...
- Patent number 5,110,792
- Issue date May 5, 1992
- Hitachi, Ltd.
- Takahiro Nakayama
- G02 - OPTICS
Information Patent Grant
Optically readable mail system with general and receiver specific i...
- Patent number 5,018,072
- Issue date May 21, 1991
- Hitachi, Ltd.
- Masahiko Ibamoto
- B07 - SEPARATING SOLIDS FROM SOLIDS SORTING
Information Patent Grant
Optical element, optical disc and rotary encoder with the optical e...
- Patent number 4,978,187
- Issue date Dec 18, 1990
- Hitachi, Ltd.
- Hiroyuki Minemura
- G11 - INFORMATION STORAGE
Information Patent Grant
Intergrated optical head with flexible substrate portion
- Patent number 4,937,808
- Issue date Jun 26, 1990
- Hitachi, Ltd.
- Satoshi Shimada
- G02 - OPTICS
Information Patent Grant
Optical head with optical beam control using acoustic wave device
- Patent number 4,862,440
- Issue date Aug 29, 1989
- Hitachi, Ltd.
- Norifumi Miyamoto
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical recording and reproducing device
- Patent number 4,811,328
- Issue date Mar 7, 1989
- Hitachi, Ltd.
- Tetsuo Ito
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical information recording device
- Patent number 4,773,060
- Issue date Sep 20, 1988
- Hitachi, Ltd.
- Satoshi Shimada
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical information apparatus and method of recording and erasing i...
- Patent number 4,718,053
- Issue date Jan 5, 1988
- Hitachi, Ltd.
- Yoshio Sato
- G11 - INFORMATION STORAGE

Hiroaki Koyanagi

Person

Patents Grantslast 30 patents

Recording/reproducing separation type magnetic head

Method of fabricating a magnetoresistive thin-film magnetic head

Recording/reproducing separation type magnetic head

Personal information display system for serving large capacities of...

Magnetoresistive thin-film magnetic head and method of fabrication...

Thin film magnetoresistive head which includes a domain suppressing...

Optical memory medium and its information recording and erasing met...

Method and apparatus of optical modulation using superconductive ox...

Optically readable mail system with general and receiver specific i...

Optical element, optical disc and rotary encoder with the optical e...

Intergrated optical head with flexible substrate portion

Optical head with optical beam control using acoustic wave device

Optical recording and reproducing device

Optical information recording device

Optical information apparatus and method of recording and erasing i...