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Hiroshi Masunaga — 31 Patents

OKOkamura: 21 patents #7 of 116Top 7%

TSToshiba Mitsubishi-Electric Industrial Systems: 7 patents #48 of 368Top 15%

Mitsubishi Electric: 2 patents #11,187 of 25,717Top 45%

TTThe Ritsumeikan Trust: 1 patents #34 of 141Top 25%

TMTmeic: 1 patents #51 of 132Top 40%

Chuo, JP: #11 of 472 inventorsTop 3%

Overall (All Time): #115,823 of 4,157,543Top 3%

31 Patents All Time

Hiroshi Masunaga has been granted 31 US patents while listed as an inventor at Okamura. The first was granted in 2001 and the most recent in February 2025. Hiroshi Masunaga ranks #115,823 of 4,157,543 US inventors in our database (top 2.8%). Patent records list Hiroshi Masunaga in Chuo, JP.

Patents per Year

Issued Patents All Time

Showing 1–25 of 31 patents

Patent #	Title	Co-Inventors	Date
12218545	Uninterruptible power supply	Ryoji TSURUTA, Tomohiro Tanaka	2025-02-04
11929689	Power conversion device	Ryoji TSURUTA, Tomohiro Tanaka	2024-03-12
11439239	Backrest and chair	Syunsuke ISHIMARU	2022-09-13
11019930	Load support structure for chair, load support body for chair, and chair	Syouichi Izawa	2021-06-01
11019928	Armrest and chair	Yuuichirou Takagi, Ryo Igarashi, Syouichi Izawa	2021-06-01
10966530	Backrest, lumbar support, chair, attachment structure for optional member, optional member, and furniture	Shinpei Totsuka	2021-04-06
10932575	Armrest and chair	Ryo Igarashi, Syouichi Izawa	2021-03-02
10756567	Uninterruptible power supply device	Akihiro Yamanishi	2020-08-25
10334953	Furniture, load support member for chair, and chair	Yoshinori Isogai, Kouichirou Wakizono, Naoyuki Okuda, Syouichi Izawa	2019-07-02
10264886	Reaction force mechanism and chair using same	—	2019-04-23
10263459	Power supply system	Keisuke Ohnishi	2019-04-16
10263457	Uninterruptible power supply device and uninterruptible power supply system using the same	Kazuki Nishimura, Masahiro Kinoshita	2019-04-16
10159350	Chair	Ryo Igarashi	2018-12-25
10050469	Uninterruptible power supply device and uninterruptible power supply system using the same	Kazuki Nishimura, Masahiro Kinoshita	2018-08-14
10044281	Bidirectional insulated DC/DC converter and smart network using the same	Kazunori Sanada, Yoshitaka KAWABATA, Takao Kawabata	2018-08-07
9755457	Uninterruptible power supply apparatus	Tingan Lee, Masaru Toyoda	2017-09-05
9603451	Height adjustment device in fixture, and armrest device for chair provided with height adjustment device	Yuuichirou Takagi, Youichirou Oda, Alexander Hurford	2017-03-28
9578968	Chair	Ryo Igarashi, Syouichi Izawa	2017-02-28
8777321	Stretching structure of chair upholstery material	Sayaka Morio, Ryou Igarashi	2014-07-15
8191970	Backrest device in a chair	Ryo Igarashi, Hiroaki Tsukiji	2012-06-05
8172332	Chair backrest device	Ryo Igarashi, Yoichiro Oda	2012-05-08
8172323	Locking device for a movable member in a chair	—	2012-05-08
7837272	Chair and the structure for stretching a mesh over an element of the chair	Tetsuya Narita, Ryo Igarashi, Akira Kiyoku, Ken Nakayama	2010-11-23
7726740	Backrest-tilting device	—	2010-06-01
7246859	Chair	Ryo Igarashi, Naoki Numa, Ken Nakayama	2007-07-24