Inventor

Hajime Aoi

Inventor

Tachikawa, JP

Overview

32→

Patents

1981–2014

Patent span

Physics

Primary field (CPC G)

Patents· 32 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

G11Bprimary

G11BInformation storage based on relative movement between record carrier and transducer55%

G06FElectric digital data processing8%

B82YSpecific uses or applications of nanostructures6%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests6%

Y10TTechnical subjects covered by former us classification6%

B82BNanostructures formed by manipulation of individual atoms, molecules, or limited collections of atoms or molecules as discrete units4%

G01QScanning-probe techniques or apparatus4%

H01FMagnets4%

H01JElectric discharge tubes or discharge lamps4%

H10NElectric solid-state devices not otherwise provided for4%

PatentTitleYear

8,691,402'Perpendicular magnetic recording medium'2014 8,323,808'Perpendicular magnetic recording medium'2012 8,076,012'Magnetic thin film and method for forming the film, and magnetic thin film-applied device'2011 7,993,762'Magnetic thin film and method of manufacturing the same, and various application devices using the same'2011 6,243,824'Array disk subsystem'2001 6,069,762'Magnetic recording drive having arrangement for averaging useful life of magnetoresistive effect sensors'2000 6,014,275'Magnetic recording drive'2000 5,740,142'Method and apparatus for fast transfer of data in recording and reproducing system'1998 5,689,494'Surface atom fabrication method and apparatus'1997 5,671,107'Large capacity magnetic disc apparatus with a particular relationship between pole thickness, saturated flux density, and recording wavelength'1997 5,572,379'Magnetic recording drive having arrangements for average useful life of magnetorestive effects sensors'1996 5,572,699'Variable length data in a parallel disk array'1996 5,568,331'Method of head positioning and magnetic recording disk drive using the same'1996 5,416,331'Surface atom fabrication method and apparatus'1995 5,402,428'Array disk subsystem'1995 5,337,198'Digital magnetic writing and reading apparatus'1994 5,325,364'Method for error correction and circuit for realizing same'1994 5,287,228'Peak detection method and apparatus therefor'1994 5,193,034'Magnetic disk apparatus of constant-density recording type, magnetic disk used therefor and servo-writing device for patterning on the magnetic disk'1993 5,132,854'High speed seek sector servo magnetic disk drive unit'1992 5,109,311'Magnetic disk device and method of recording/retrieving information'1992 5,008,761'Readout circuit in magnetic recording device'1991 4,907,100'Readout circuit in magnetic recording device'1990 4,851,939'Actuator driving apparatus and magnetic disk drive system with a smaller number of high power amplifiers than actuators'1989 4,823,208'Multi slice level signal circuit'1989 4,792,497'Magnetic recording media for longitudinal recording'1988 4,777,553'Magnetic head'1988 4,774,601'Read channel for magnetic recording'1988 4,755,891'Circuit for processing waveform of reproduced signal in magnetic reproducing apparatus'1988 4,651,236'Waveform equalizing circuit'1987 4,644,424'Equalizer used for magnetic storage device'1987 4,249,219'Current drive circuit for an induction coil'1981

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1981–2001Patents assigned to HITACHI LTD (28)· patent assignee history

1981Based in Chofu, JP· patent location history

1987–2001Based in Tachikawa, JP· patent location history

1995Based in Tokyo, JP· patent location history

2011–2014Patents assigned to FUJI ELECTRIC CO LTD (3)· patent assignee history

2011–2012Patents assigned to AOI HAJIME (2)· patent assignee history

2011–2012Patents assigned to KITAKAMI OSAMU (2)· patent assignee history

2011–2012Patents assigned to OKAMOTO SATOSHI (2)· patent assignee history

2011–2014Based in Sendai, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
HITACHI LTD	28	1981–2001
FUJI ELECTRIC CO LTD	3	2011–2014
AOI HAJIMEself	2	2011–2012
KITAKAMI OSAMU	2	2011–2012
OKAMOTO SATOSHI	2	2011–2012

Locations

Location	Patents	Span
Tachikawa, JP	26	1987–2001
Sendai, JP	4	2011–2014
Tokyo, JP	1	1995
Chofu, JP	1	1981