Inventor

Fumio Andow

Inventor

Hachioji, JP

Overview

1977–1998

Patent span

Electricity

Primary field (CPC H)

Patents· 17 as inventor

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

H02Hprimary

H02HEmergency protective circuit arrangements68%

G01RMeasuring electric variables11%

F02BInternal-combustion piston engines5%

G06FElectric digital data processing5%

G11CStatic stores5%

H03MCoding5%

PatentTitleYear

5,796,630'Protective relay system provided with difference and addition filters'1998 4,825,326'Digital calculation type differential relay'1989 4,803,635'Information data output device for electric-power systems'1989 4,774,621'Protective control method and apparatus'1988 4,561,120'Protective relaying system'1985 4,541,058'Protective relay system'1985 4,511,981'Protective relaying system'1985 4,507,700'Protective relaying system'1985 4,484,246'Reclosing device for transmission line'1984 4,371,908'Digital protective relaying systems'1983 4,370,571'Relay device'1983 4,309,767'Monitor system for a digital signal'1982 4,212,046'Distance relaying systems'1980 4,073,009'Apparatus for calculating amplitude values of sinusoidal waves'1978 4,073,008'Apparatus for calculating amplitude values'1978 4,071,873'Apparatus for detecting abnormal conditions of transmitted signals'1978 4,056,839'Protective relay devices'1977

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1977–1985Patents assigned to TOKYO SHIBAURA ELECTRIC CO (13)· patent assignee history

1977–1989Based in Hachioji, JP· patent location history

1980Patents assigned to TOKYO DENRYOKI K K (1)· patent assignee history

1984–1998Based in Tokyo, JP· patent location history

1985Based in Hachiohji, JP· patent location history

1988–1998Patents assigned to TOSHIBA KK (4)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
TOKYO SHIBAURA ELECTRIC CO	13	1977–1985
TOSHIBA KK	4	1988–1998
TOKYO DENRYOKI K K	1	1980

Locations

Location	Patents	Span
Hachioji, JP	12	1977–1989
Tokyo, JP	3	1984–1998
Hachiohji, JP	2	1985