Keizo Kumagai — 10 Patents at Mitsumi Electric Co.

Keizo Kumagai has been granted 10 US patents while listed as an inventor at Mitsumi Electric Co.. The first was granted in 2008 and the most recent in July 2022. Keizo Kumagai ranks #481,000 of 4,157,543 US inventors in our database (top 11.6%). Patent records list Keizo Kumagai in Yokohama, JP.

Patents per Year

Issued Patents All Time

Showing 1–10 of 10 patents

Patent #	Title	Co-Inventors	Date
11387821	Pulse signal sending circuit	—	2022-07-12
9048729	Step-up/down DC-DC converter and switching control circuit	Takashi Hiroshima	2015-06-02
8957650	Step-up/down DC-DC converter and switching control circuit	Takashi Hiroshima	2015-02-17
8310219	DC-DC converter with a PWM mode and a continuously on mode	Masaki Kuroyabu, Takashi Hiroshima	2012-11-13
8193793	DC-DC converter	Takashi Hiroshima	2012-06-05
7977889	Direct-current power supply device, power supply device for driving LED and semiconductor integrated circuit for driving power supply	Takashi Hiroshima	2011-07-12
7977890	Direct current power supply device, power supply device for driving LED and semiconductor integrated circuit for controlling power supply	—	2011-07-12
7733070	Multi-output type DC/DC converter	—	2010-06-08
7378823	Multi-output type DC/DC converter with a constant on time interval in a steady state	Yuji Yamanaka, Tatsuya Inenaga, Takeshi Satou	2008-05-27
7372239	Multi-output type DC/DC converter	Yuji Yamanaka	2008-05-13