Inventor

Naoki Koyama

Inventor

Kokubunji, JP

Overview

38→

Patents

1982–2011

Patent span

Physics

Primary field (CPC G)

Patents· 38 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 transducer31%

Y10TTechnical subjects covered by former us classification16%

H01FMagnets11%

B82YSpecific uses or applications of nanostructures10%

G01RMeasuring electric variables10%

H10NElectric solid-state devices not otherwise provided for10%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests3%

G03FPhotomechanical production of textured or patterned surfaces, e.g. for printing, for processing of semiconductor devices2%

H10PGeneric processes or apparatus for the manufacture or treatment of devices covered by class h102%

C08GMacromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds1%

PatentTitleYear

7,957,109'Magnetic head of magnetoresistance effect type with high resistance to external stress'2011 7,727,135'Conductive rubber roller'2010 7,675,715'Magnetoresistive head and fabricating method thereof, and read write separation type head'2010 7,586,715'Magnetic head with a narrow spacing between magnetic shields at air bearing surface'2009 7,382,576'Thin film magnetic head and magnetic disk apparatus including the same'2008 7,159,303'Method for manufacturing magnetic head device'2007 7,068,467'Thin film magnetic head and magnetic disk apparatus including the same'2006 7,054,120'Magnetic apparatus with perpendicular recording medium and head having multilayered reproducing element using tunneling effect'2006 6,877,212'Manufacturing method of a thin film magnetic head'2005 6,839,200'Combination perpendicular magnetic head having shield material formed at both ends of an upper pole of a write element'2005 6,687,099'Magnetic head with conductors formed on endlayers of a multilayer film having magnetic layer coercive force difference'2004 6,665,141'Magnetic head having track width defined by trench portions filled with magnetic shield material'2003 6,538,844'Method of fabricating a magnetic head by focused ion beam etching'2003 6,483,663'Thin film magnetic head and magnetic disk apparatus including the same'2002 6,483,677'Magnetic disk apparatus including magnetic head having multilayered reproducing element using tunneling effect'2002 6,307,707'Narrow track thin film head including magnetic poles machined by focused ion beam etching'2001 6,278,578'Narrow track thin film head having a focused ion beam etched air bearing surface'2001 6,278,593'Magnetoresistance effect elements and magnetic heads using the tunneling magnetoresistive effect'2001 6,111,723'Narrow track thin film magnetic head suitable for high density recording and reproducing operations and fabrication method thereof wherein an air bearing surface has at least one groove containing a non-magnetic electrically conductive layer'2000 6,011,674'Magnetoresistance effect multilayer film with ferromagnetic film sublayers of different ferromagnetic material compositions'2000 5,850,326'Narrow track thin film magnetic head suitable for high density recording and reproducing operations and fabrication method thereof wherein an air bearing surface has at least one groove containing a non-magnetic electrically conductive layer'1998 5,808,843'Magnetoresistance effect reproduction head'1998 5,726,837'Multilayer magnetoresistance effect-type magnetic head'1998 5,719,729'Magnetic head and recording and reproducing apparatus having an arrangement for improving coincidence between a magnetic center of a read head and physical center of a write head'1998 5,521,005'Magnetoresistive head'1996 5,461,526'Magnetoresistive read head and magnetic storage system using the same'1995 5,390,061'Multilayer magnetoresistance effect-type magnetic head'1995 5,337,203'Magnetoresistive magnetic head'1994 5,287,237'Antiferromagnetic film superior in corrosion resistance, magnetoresistance-effect element and magnetoresistance-effect head including such thin film'1994 5,212,609'Magnetoresistive head'1993 5,168,409'Integrated magnetic head having a magnetic layer functioning as both a magnetic shield and a magnetic pole'1992 5,126,907'Thin film magnetic head having at least one magnetic core member made at least partly of a material having a high saturation magnetic flux density'1992 4,922,360'Magnetic head'1990 4,772,505'Magnetic bubble memory element'1988 4,502,916'Process for forming fine patterns'1985 4,503,517'Magnetic bubble memory device'1985 4,415,262'Photomask'1983 4,354,203'Lens control mechanism for television camera'1982

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1982Patents assigned to CANON KK (1)· patent assignee history

1982–2011Based in Tokyo, JP· patent location history

1983–2005Patents assigned to HITACHI LTD (28)· patent assignee history

1983–2007Based in Kokubunji, JP· patent location history

1985Based in Hachioji, JP· patent location history

2002–2008Based in Nakano-ku, JP· patent location history

2005–2010Patents assigned to HITACHI GLOBAL STORAGE TECH (7)· patent assignee history

2010Patents assigned to CANON KASEI KK (1)· patent assignee history

2010Based in Ushiku, JP· patent location history

2011Patents assigned to HITACHI GLOBAL STORAGE TECH NL (1)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
HITACHI LTD	28	1983–2005
HITACHI GLOBAL STORAGE TECH	7	2005–2010
CANON KASEI KK	1	2010
CANON KK	1	1982
HITACHI GLOBAL STORAGE TECH NL	1	2011

Locations

Location	Patents	Span
Kokubunji, JP	26	1983–2007
Tokyo, JP	5	1982–2011
Nakano-ku, JP	4	2002–2008
Hachioji, JP	2	1985
Ushiku, JP	1	2010