Inventor

Sumiko Seki

Inventor

Yokohama, JP

Overview

4→

Patents

2003–2007

Patent span

Mechanical engineering

Primary field (CPC F)

Patents· 4 as inventor

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

F15Bprimary

F15BSystems acting by means of fluids in general22%

E02FDredging11%

F03DWind motors11%

F05BIndexing scheme relating to wind, spring, weight, inertia or like motors, to machines or engines for liquids covered by subclasses f03b, f03d and f03g11%

H02JElectric power networks11%

H02MApparatus for conversion between ac and ac, between ac and dc, or between dc and dc, and for use with mains or similar power supply systems11%

Y02EReduction of greenhouse gas [ghg] emissions, related to energy generation, transmission or distribution11%

Y02PClimate change mitigation technologies in the production or processing of goods11%

PatentTitleYear

7,231,763'Hydraulic apparatus'2007 7,043,906'Hydraulic equipment'2006 6,636,431'Symmetrical DC/DC converter'2003 6,538,414'Electric energy storage device with cell energy control, and method of controlling cell energy'2003

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

2003Patents assigned to NEC TOKIN CORP (1)· patent assignee history

2003Patents assigned to TOKIN CORP (1)· patent assignee history

2003Based in Tokyo, JP· patent location history

2006Patents assigned to YUKIGAWA INST CO LTD (1)· patent assignee history

2006–2007Based in Yokohama, JP· patent location history

2007Patents assigned to YUKIGAYA INST CO LTD (1)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
NEC TOKIN CORP	1	2003
TOKIN CORP	1	2003
YUKIGAWA INST CO LTD	1	2006
YUKIGAYA INST CO LTD	1	2007

Locations

Location	Patents	Span
Yokohama, JP	2	2006–2007
Tokyo, JP	2	2003