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Inventor

Ryutaro Arakawa

Inventor
Hyogo, JP

Overview

8→
Patents
1990–2010
Patent span
Electricity
Primary field (CPC H)

Patents· 8 as inventor

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

H05Bprimary
H05BElectric heating27%
H10WGeneric packages, interconnections, connectors or other constructional details of devices covered by class h1018%
B23KSoldering or unsoldering9%
G05FSystems for regulating electric or magnetic variables9%
G06KGraphical data reading9%
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 systems9%
H05KPrinted circuits9%
Y02BClimate change mitigation technologies related to buildings, e.g. housing, house appliances or related end-user applications9%
PatentTitleYear
7,834,828'Led driving semiconductor apparatus provided with controller including regulator and drain current detector of switching element block'20107,638,954'Light emitting diode drive apparatus'20097,508,254'Reference supply voltage circuit using more than two reference supply voltages'20097,348,766'Switching power supply device'20087,115,888'LED driving semiconductor circuit and LED driving apparatus including the same'20066,021,058'PWM inverter with zero dead time and initial power supply capacitor charging'20005,061,990'Semiconductor device and the manufacture thereof'19914,962,415'IC card'1990

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1990–1991Patents assigned to HITACHI MAXELL (2)· patent assignee history
1990–1991Based in Ibaraki, JP· patent location history
2000–2008Patents assigned to MATSUSHITA ELECTRIC INDUSTRIAL CO LTD (3)· patent assignee history
2000–2008Based in Amagasaki, JP· patent location history
2009–2010Patents assigned to PANASONIC CORP (3)· patent assignee history
2009–2010Based in Hyogo, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
MATSUSHITA ELECTRIC INDUSTRIAL CO LTD32000–2008
PANASONIC CORP32009–2010
HITACHI MAXELL21990–1991
Locations
LocationPatentsSpan
Hyogo, JP32009–2010
Amagasaki, JP32000–2008
Ibaraki, JP21990–1991