Inventor

Tetsuo Sekiya

Inventor

Kanagawa, JP

Overview

1978–2013

Patent span

Physics

Primary field (CPC G)

Patents· 19 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 transducer67%

F16CShafts10%

H02KDynamo-electric machines10%

F02PIgnition, other than compression ignition, for internal-combustion engines5%

H02PControl or regulation of electric motors, electric generators or dynamo-electric converters5%

H05BElectric heating5%

PatentTitleYear

8,575,878'Energy converter'2013 5,872,691'Thin film magnetic head, magnetoresistance effect magnetic head and composite magnetic head'1999 5,822,159'Thin-film magnetic head, magnetoresistance effect magnetic head and composite magnetic head'1998 5,436,772'Magnetic recording and reproducing apparatus having magneto-resistance effect element'1995 5,424,890'Magnetoresistance effect type thin film head'1995 5,313,342'Analog/digital compatible reproducing system'1994 5,260,836'Apparatus for reproducing digital and analog audio signals'1993 5,197,806'Bearing system'1993 5,145,259'Bearing system'1992 5,065,390'Optical playback head'1991 4,757,410'Magnetoresistance effect for short and long wavelength recordings'1988 4,729,048'Magnetic transducer combination with formatting, data, and servo heads'1988 4,713,710'Compact multiple magnetic head apparatus'1987 4,701,815'Tracking servo system for disc memory'1987 4,673,998'Magnetic transducer head having series connected magnetroresistance effect sensing element with head output connected between the sensing elements'1987 4,524,401'Magnetic transducer head utilizing magneto resistance effect with a bias field and partial saturation'1985 4,516,179'Magnetic transducer head utilizing magnetoresistance effect'1985 4,167,692'Brush-less DC motor'1979 4,077,373'Ignition timing control device for an internal combustion engine'1978

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1978Patents assigned to HONDA MOTOR CO LTD (1)· patent assignee history

1978Based in Fujimi, JP· patent location history

1979–1999Patents assigned to SONY CORP (17)· patent assignee history

1979–2013Based in Yokohama, JP· patent location history

1987–1999Based in Kanagawa, JP· patent location history

1987Based in Tokyo, JP· patent location history

1995Based in Shinagawa-ku, JP· patent location history

2013Patents assigned to NARITA KIYOTSUGU (1)· patent assignee history

2013Patents assigned to SEKIYA TETSUO (1)· patent assignee history

2013Patents assigned to TBK CO LTD (1)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
SONY CORP	17	1979–1999
HONDA MOTOR CO LTD	1	1978
NARITA KIYOTSUGU	1	2013
SEKIYA TETSUOself	1	2013
TBK CO LTD	1	2013

Locations

Location	Patents	Span
Kanagawa, JP	11	1987–1999
Yokohama, JP	5	1979–2013
Shinagawa-ku, JP	1	1995
Tokyo, JP	1	1987
Fujimi, JP	1	1978