Inventor

KIKUGAWA ATSUSHI

JP53 patents

⚠️ This page may combine multiple inventors who share the name “KIKUGAWA ATSUSHI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

KIKUGAWA ATSUSHI

HITACHI LTD

Perpendicular magnetic recording media, magnetic recording apparatus

Surface observing apparatus and method

Surface atom fabrication method and apparatus

Information read device and read signal processing circuit

Perpendicular magnetic recording media and magnetic storage apparatus using the same

Perpendicular magnetic recording media, manufacturing process of the same, and magnetic storage apparatus using the same

Surface atom fabrication method and apparatus

Scanning probe microscope and method of control error correction

Optical disk apparatus and playback signal processing method

Read signal processing circuit, read signal processing method, and optical disc drive

Method for testing or recording servo signal on perpendicular magnetic recording media

Method for testing or recording servo signal on perpendicular magnetic recording media

Perpendicular magnetic recording media and magnetic storage apparatus using the same

Perpendicular magnetic recording media

Optical disk apparatus

Optical disc drive provided with envelope defect detection function

Optical disk apparatus and PLL circuit

Information read device and read signal processing circuit

Optical disk device and integrated circuit used therein

Optical disc apparatus with adjustable constraint length PRML

Perpendicular magnetic recording media and magnetic storage

HITACHI GLOBAL STORAGE TECH

Stray field detector, magnetic disk drive, and method of head escaping

Perpendicular magnetic recording medium and magnetic recording/reproducing apparatus

Perpendicular magnetic recording medium, manufacturing process of the same, and magnetic storage apparatus using the same

Perpendicular magnetic recording media, manufacturing process of the same, and magnetic storage apparatus using the same

Perpendicular magnetic recording media, magnetic recording apparatus

Perpendicular magnetic recording media, manufacturing process of the same, and magnetic storage apparatus using the same

Perpendicular magnetic recording media, magnetic recording apparatus

Perpendicular magnetic recording media

Magnetic hard disk drive with countermeasure against spike noise

HITACHI CONSUMER ELECTRONICS

Optical disk apparatus

Channel bitword processor, PRML decoder, and optical information recording/reproducing device

Optical information reproduction apparatus using homodyne phase diversity detection with improved SNR

Optical information recording medium, recording and reproduction method, and recording and reproduction device

Optical information recording medium, optical information recording and reproducing device, and recording method

Signal conversion module and optical disc apparatus using the same

KIKUGAWA ATSUSHI

R-Fe-B based sintered magnet having on the surface thereof vapor deposited film of aluminum or alloy thereof, and method for producing the same

Read signal evaluation method, information recording and reading method, and information recording and reading apparatus

High-speed optical disk drive

Corrosion-resistant magnet and method for producing the same

Offset compensator and optical disc drive using the same

Optical disc drive

NEOMAX CO LTD

Rare earth metal-based permanent magnet having corrosion-resistant film and method for producing the same

Rare earth metal-based permanent magnet having corrosion-resistant film and method for producing the same

HITACHI METALS LTD

Method for recovering heavy rare earth element

Method for recovering rare earth element

SUMITOMO SPEC METALS

Process for producing rare earth metal-based permanent magnet having corrosion-resistant film

HOSHI HIROYUKI

Method for recovering rare earth element

FURUSAWA KATSUYOSHI

Method for producing R-Fe-B based permanent magnet alloy recycled material having removed carbon

FUJIHARA MAHORO

Method for producing surface-modified rare earth metal-based sintered magnet and surface-modified rare earth metal-based sintered magnet