Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
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Masaaki Matsuo — 25 Patents

Rohm Co.: 9 patents #331 of 2,292Top 15%
TCToyo Ink Mfg. Co.: 8 patents #10 of 499Top 3%
Mitsubishi Electric: 5 patents #5,859 of 25,717Top 25%
MDMitsubishi Electric System Lsi Design: 4 patents #6 of 98Top 7%
DCDds Company: 1 patents #14 of 24Top 60%
MCMishima Kosan Co.: 1 patents #4 of 33Top 15%
KTKyushu Institute Of Technology: 1 patents #75 of 237Top 35%
Kyoto, JP: #711 of 11,909 inventorsTop 6%
Overall (All Time): #158,593 of 4,157,543Top 4%
25 Patents All Time
Masaaki Matsuo has been granted 25 US patents while listed as an inventor at Rohm Co.. The first was granted in 1989 and the most recent in November 2025. Masaaki Matsuo ranks #158,593 of 4,157,543 US inventors in our database (top 3.8%). Patent records list Masaaki Matsuo in Kyoto, JP.

Patents per Year

Patents granted per year, 1989 to 2025Bar chart with a peak of 4 patents in 2000.peak 41989: 1 patents19891991: 2 patents1995: 2 patents19951996: 2 patents1999: 2 patents19992000: 4 patents2013: 1 patents20132021: 2 patents2022: 1 patents20222023: 3 patents2024: 3 patents20242025: 2 patents2025

Issued Patents All Time

Showing 1–25 of 25 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
12483241 Semiconductor device Kohsaku Shibata 2025-11-25
12401000 Semiconductor device Kenji Hayashi, Akihiro Suzaki, Ryuta Watanabe, Makoto IKENAGA 2025-08-26
12119290 Semiconductor device Takumi Kanda, Soichiro TAKAHASHI, Yoshitoki Inami, Kaito INOUE 2024-10-15 $654,000
12068235 Semiconductor device Yoshihisa Tsukamoto 2024-08-20 $655,000
D1012048 Semiconductor module Yoshihisa Tsukamoto, Akihiro Kimura 2024-01-23
11801372 Microneedle array Toshiaki Atari, Yasunori Tashiro, Masaya Hara, Junji Kuroki, Takahiro Ito +1 more 2023-10-31
11776936 Semiconductor device Kenji Hayashi, Akihiro Suzaki, Ryuta Watanabe, Makoto IKENAGA 2023-10-03 $721,000
11670572 Semiconductor device Takumi Kanda, Soichiro TAKAHASHI, Yoshitoki Inami, Kaito INOUE 2023-06-06 $689,000
11233037 Semiconductor device Kenji Hayashi, Akihiro Suzaki, Ryuta Watanabe, Makoto IKENAGA 2022-01-25 $1,016,000
11211312 Semiconductor device Takumi Kanda, Soichiro TAKAHASHI, Yoshitoki Inami, Kaito INOUE 2021-12-28
11127662 Semiconductor device Kenji Hayashi, Akihiro Suzaki, Soichiro TAKAHASHI, Masashi Hayashiguchi, Yoshihisa Tsukamoto 2021-09-21
8369583 Hybrid biometric authentication device, hybrid biometric authentication method, and computer-readable medium storing hybrid biometric authentication program Tatsuki Yoshimine, Masahiro Hoguro, Taizo Umezaki 2013-02-05
6114866 Semiconductor device test board and method for evaluating semiconductor devices Tsuyoshi Saitoh, Takekazu Yamashita, Michio Nakajima, Akira Kitaguchi, Hideki Toki 2000-09-05
6092227 Test circuit Hideki Toki, Akira Kitaguchi, Makoto Hatakenaka, Kiyoyuki Shiroshima, Tsuyoshi Saitoh 2000-07-18
6043522 Field effect transistor array including doped two-cell isolation region for preventing latchup Michio Nakajima, Makoto Hatakenaka, Akira Kitaguchi, Kiyoyuki Shiroshima, Takekazu Yamashita 2000-03-28
6025733 Semiconductor memory device Tuyoshi Saitoh, Akira Kitaguchi, Makoto Hatakenaka, Toshio Nakano, Yuko Sudo 2000-02-15
5926429 Semiconductor memory device and method of refreshing semiconductor memory device Tsuyoshi Saitoh, Kiyoyuki Shiroshima, Michio Nakajima, Nobuyuki Fujii, Akira Kitaguchi 1999-07-20
RE36212 Image transfer apparatus Takayuki Kimura 1999-05-25
5533451 Image transfer apparatus with transfer drum clamping mechanism Takayuki Kimura 1996-07-09
5503075 Image transfer apparatus and method for ejecting image receptor Takayuki Kimura 1996-04-02
5408297 Image transfer apparatus Takayuki Kimura 1995-04-18
5402727 Image transfer apparatus and method for ejecting image receptor Takayuki Kimura 1995-04-04
5055375 Method of image formation using heated rollers Masujiro Sumita, Isao Hosoi, Hirohumi AOKI, Masaru Ohta 1991-10-08
5019860 Apparatus for image formation and method of image formation Toshio Shimada, Seishiro Hamada 1991-05-28
4835576 Opaquing method and apparatus thereof Keiji Komori, Masaru Ohta, Takashi Sawada 1989-05-30