Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
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Masao Kumagai — 21 Patents

Fujitsu Limited: 9 patents #3,538 of 24,456Top 15%
ACAlps Electric Co.: 4 patents #470 of 2,177Top 25%
FLFujitsu Semiconductor Limited: 2 patents #355 of 1,301Top 30%
FCFuji Manufacturing Co.: 1 patents #14 of 29Top 50%
FLFujitsu Microelectronics Limited: 1 patents #212 of 624Top 35%
FCFuji Kihan Co.: 1 patents #3 of 12Top 25%
JAJatco: 1 patents #458 of 871Top 55%
KLKyushu Fujitsu Electronics Limited: 1 patents #41 of 75Top 55%
SLSpansion Llc.: 1 patents #435 of 769Top 60%
YSYamasa Shoyu: 1 patents #31 of 70Top 45%
Osaki, JP: #6 of 142 inventorsTop 5%
Overall (All Time): #201,324 of 4,157,543Top 5%
21 Patents All Time
Masao Kumagai has been granted 21 US patents while listed as an inventor at Fujitsu Limited. The first was granted in 1981 and the most recent in September 2014. Masao Kumagai ranks #201,324 of 4,157,543 US inventors in our database (top 4.8%). Patent records list Masao Kumagai in Osaki, JP.

Patents per Year

Patents granted per year, 1981 to 2014Bar chart with a peak of 3 patents in 2007.peak 31981: 1 patents19811983: 1 patents1987: 1 patents19871988: 2 patents1989: 2 patents19891999: 1 patents2005: 1 patents20052006: 2 patents2007: 3 patents20072009: 2 patents2010: 1 patents20102011: 2 patents2013: 1 patents20132014: 1 patents2014

Issued Patents All Time

Showing 1–21 of 21 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
8823344 Control circuit, electronic device, and method for controlling power supply Koichiro Kushida, Kazuyoshi Futamura 2014-09-02 $2,414,000
8518543 DLC-coated sliding member and method for producing the same Makoto Kano, Takahiro Horiuchi, Shinichi Takagi, Eiji Shimodaira, Yoshio Miyasaka 2013-08-27
7978168 D/A converter Hideto Fukuda, Shinya Udo, Osamu Kudo 2011-07-12
7903071 Driver IC for display and display including same Hideto Fukuda, Shinya Udo, Osamu Kudo 2011-03-08
7838075 Surface strengthening method Yoshio Jimbo, Fumiya Yakabe 2010-11-23
7580020 Semiconductor device and liquid crystal panel driver device Shinya Udo, Masatoshi Kokubun, Hidekazu Nishizawa, Takeo Shigihara 2009-08-25
7567873 Nondestructive inspection method and apparatus for a surface processed by shot peening Takashi Kojima, Kiyoshi Hoshikawa, Shozo Ishibashi 2009-07-28
7268763 Method for driving display and drive circuit for display Hideto Fukuda, Shinya Udo, Osamu Kudo 2007-09-11
7215312 Semiconductor device, display device, and signal transmission system Shinya Udo 2007-05-08
7180512 Integrated circuit free from accumulation of duty ratio errors Hideto Fukuda, Shinya Udo 2007-02-20
7098878 Semiconductor device and liquid crystal panel driver device Shinya Udo, Masatoshi Kokubun, Hidekazu Nishizawa, Takeo Shigihara 2006-08-29
7079104 Semiconductor device and liquid crystal panel display driver Shinya Udo 2006-07-18
6847346 Semiconductor device equipped with transfer circuit for cascade connection Shinya Udo 2005-01-25
5939543 Stable solid 2-octynyl adenosine and process for producing the same Manami Morozumi, Toyofumi Yamaguchi 1999-08-17
4883975 Schmitt trigger circuit Hiromu Enomoto, Hirofumi Dohgome, Toru Nakamura, Kimitaka Yoshiyama 1989-11-28
4835642 Magnetic head assembly for double-sided disk drive apparatus Masatoshi Furukawa, Tadami Sugawara, Hatsuo Sasaki, Yuichi Hishi, Atsushi Takahashi 1989-05-30
4774620 Logic circuit Hiromu Enomoto, Yasushi Yasuda, Akinori Tahara 1988-09-27
4764830 Magnetic head assembly in floppy disk drive Kazuo Kobayashi, Atsushi Takahashi, Kenji Abe 1988-08-16
4703202 Two-stage gate circuit providing inverted and non-inverted outputs Hiromu Enomoto, Yasushi Yasuda, Akinori Tahara 1987-10-27
4383153 Locking type push-button switch Shiro Kondo 1983-05-10
4259559 Illuminated push-button electrical switch assembly Shiro Kondo 1981-03-31