Kumagai; Keizo

Patent Applications and Registrations

Patent applications and USPTO patent grants for Kumagai; Keizo.The latest application filed is for "pulse signal sending circuit".

Company Profile

0.13.13

Kumagai; Keizo - Inagi JP
KUMAGAI; Keizo - Tokyo JP
Kumagai; Keizo - Atsugi N/A JP
Kumagai; Keizo - Atsugi-shi JP
Kumagai; Keizo - Tama JP
Kumagai; Keizo - Kanagawa JP

*profile and listings may contain filings by different individuals or companies with the same name. Review application materials to confirm ownership/assignment.

Patent Activity

Patent	Date
Pulse signal sending circuit Grant 11,387,821 - Kumagai July 12, 2	2022-07-12
Pulse Signal Sending Circuit App 20210258002 - KUMAGAI; Keizo	2021-08-19
Step-up/down DC-DC converter and switching control circuit Grant 9,048,729 - Kumagai , et al. June 2, 2	2015-06-02
Step-up/down DC-DC converter and switching control circuit Grant 8,957,650 - Kumagai , et al. February 17, 2	2015-02-17
Step-up/down Dc-dc Converter And Switching Control Circuit App 20120299568 - Kumagai; Keizo ; et al.	2012-11-29
Step-up/down Dc-dc Converter And Switching Control Circuit App 20120286749 - Kumagai; Keizo ; et al.	2012-11-15
DC-DC converter with a PWM mode and a continuously on mode Grant 8,310,219 - Kuroyabu , et al. November 13, 2	2012-11-13
DC-DC converter Grant 8,193,793 - Kumagai , et al. June 5, 2	2012-06-05
Switching Power-supply Unit App 20120105031 - KUMAGAI; Keizo	2012-05-03
Direct-current power supply device, power supply device for driving LED and semiconductor integrated circuit for driving power supply Grant 7,977,889 - Kumagai , et al. July 12, 2	2011-07-12
Direct current power supply device, power supply device for driving LED and semiconductor integrated circuit for controlling power supply Grant 7,977,890 - Kumagai July 12, 2	2011-07-12
Multi-output type DC/DC converter Grant 7,733,070 - Kumagai June 8, 2	2010-06-08
Dc-dc Converter App 20100102788 - KUROYABU; Masaki ; et al.	2010-04-29
Dc-dc Converter App 20090315523 - KUMAGAI; Keizo ; et al.	2009-12-24
Direct-current Power Supply Device, Power Supply Device For Driving Led And Semiconductor Integrated Circuit For Driving Power Supply App 20090174347 - Kumagai; Keizo ; et al.	2009-07-09
Direct-current Power Supply Device, Power Supply Device For Driving Led And Semiconductor Integrated Circuit For Controlling Power Supply App 20090174340 - KUMAGAI; Keizo	2009-07-09
Multi-output type DC/DC converter with a constant on time interval in a steady state Grant 7,378,823 - Yamanaka , et al. May 27, 2	2008-05-27
Multi-output type DC/DC converter Grant 7,372,239 - Kumagai , et al. May 13, 2	2008-05-13
Multi-output Type Dc/dc Converter App 20070285072 - Kumagai; Keizo	2007-12-13
Multi-ouput type DC/DC converter App 20070252563 - Kumagai; Keizo ; et al.	2007-11-01
Multi-output type DC/DC converter operable at a current discontinuous mode or a current continuous mode App 20060220622 - Yamanaka; Yuji ; et al.	2006-10-05
Multi-output type DC/DC converter with a constant on time interval in a steady state App 20060221649 - Yamanaka; Yuji ; et al.	2006-10-05

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