Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
MN

Masahiro Nakajima — 91 Patents

SISeiko Instruments: 24 patents #52 of 1,437Top 4%
Mitsubishi Electric: 8 patents #3,714 of 25,717Top 15%
Pioneer Electronic: 8 patents #194 of 1,840Top 15%
PEPentax: 6 patents #247 of 761Top 35%
PVPioneer Video: 6 patents #5 of 139Top 4%
Ricoh Company: 5 patents #3,665 of 9,818Top 40%
Nec: 5 patents #2,841 of 14,502Top 20%
TKTopy Kogyo Kabushiki Kaisha: 4 patents #11 of 189Top 6%
AKAsahi Kogaku Kogyo K.K.: 3 patents #38 of 180Top 25%
JCJapan Vilene Company: 3 patents #18 of 154Top 15%
Fujitsu Limited: 3 patents #8,614 of 24,456Top 40%
Honda Motor Co.: 3 patents #6,619 of 21,052Top 35%
SCSeikoh Giken Co.: 2 patents #26 of 69Top 40%
IHIhi: 2 patents #401 of 1,178Top 35%
Sumitomo Electric Industries: 2 patents #9,741 of 21,551Top 50%
Pioneer: 1 patents #1,107 of 1,730Top 65%
ACAsahi Glass Co.: 1 patents #1,233 of 2,251Top 55%
NCNippon Electric Co.: 1 patents #251 of 792Top 35%
SCSumitomo Mitsui Construction Co.: 1 patents #7 of 16Top 45%
Tdk: 1 patents #2,493 of 3,796Top 70%
TOToshiba: 1 patents #1,121 of 2,688Top 45%
TITopy Industries: 1 patents #7 of 33Top 25%
NTNTT: 1 patents #2,911 of 4,871Top 60%
Kabushiki Kaisha Toshiba: 1 patents #13,641 of 21,451Top 65%
DCDainippon Screen Mfg. Co.: 1 patents #531 of 977Top 55%
CHChisso: 1 patents #468 of 833Top 60%
Tokyo, JP: #533 of 90,295 inventorsTop 1%
Overall (All Time): #17,516 of 4,157,543Top 1%
91 Patents All Time
Masahiro Nakajima has been granted 91 US patents while listed as an inventor at Seiko Instruments. The first was granted in 1980 and the most recent in July 2025. Masahiro Nakajima ranks #17,516 of 4,157,543 US inventors in our database (top 0.42%). Patent records list Masahiro Nakajima in Tokyo, JP.

Patents per Year

Patents granted per year, 1990 to 2025Bar chart with a peak of 6 patents in 1990.peak 61990: 6 patents19901991: 5 patents1992: 1 patents1993: 2 patents19931994: 1 patents1995: 2 patents1996: 4 patents19961997: 3 patents1998: 2 patents1999: 4 patents19992000: 2 patents2001: 5 patents2002: 6 patents20022003: 3 patents2004: 1 patents2005: 1 patents20052006: 4 patents2010: 2 patents2012: 1 patents20122013: 1 patents2014: 1 patents2015: 4 patents20152016: 1 patents2017: 6 patents2018: 2 patents20182019: 5 patents2020: 2 patents2021: 3 patents20212024: 2 patents2025: 1 patents2025

Issued Patents All Time

Showing 1–25 of 91 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
12345293 Thrust foil bearing Tsutomu Iida, Seiichiro Yoshinaga, Shigekazu AOYAMA, Naomichi Omori 2025-07-01
12182528 Computer-readable recording medium storing information searching program, information searching method, and information searching apparatus Syohei Oshio, Naohiro Kishishita, Shigenori Inoue, Daiki Hanawa 2024-12-31
12032570 Computer-readable recording medium storing information generating program, information generating method, and information generating apparatus Syohei Oshio, Naohiro Kishishita, Shigenori Inoue, Daiki Hanawa 2024-07-09
11087915 Electronic component and manufacturing method thereof Kenichi HIRENZAKI, Makoto Endo, Masanori Suzuki, Tomonaga Nishikawa 2021-08-10
11038449 Vehicle generator control device Kensuke Kitamura, Katsuyuki Sumimoto 2021-06-15
10924045 Power generation control system, power generation control device, and external control device Keisuke Katsurada, Junya Sasaki 2021-02-16
10804828 Generator controller Norifumi Uno, Keisuke Katsurada, Junya Sasaki 2020-10-13
10541830 Serial communication system Katsuyuki Sumimoto 2020-01-21
10465374 Frame structure and method of constructing frame structure Kazuhito SUGAYA, Hiroshi Shinjo, Kouichi Hasuo, Junji Sako 2019-11-05
10462268 Data transmitting/receiving apparatus and data transmitting/receiving method Takayuki Yanai, Tomoki Yamamoto, Ryo Miyashita 2019-10-29
10461677 Vehicle-power-generator control apparatus and control method thereof Junya Sasaki, Katsuyuki Sumimoto 2019-10-29
10294886 Water jacket structure of cylinder head Yoshiki Matsushiro, Koji Nakano 2019-05-21 $285,000
10184370 Oil separation device for internal combustion engine Mayuka Odo, Kazuhiro Aoki 2019-01-22 $459,000
10141876 Power generator system, power generator control device, and power-generation balance control method for power generator system Junya Sasaki, Keisuke Katsurada, Katsuyuki Sumimoto 2018-11-27
10067475 Timepiece Takashi Niwa, Takuma Kawauchiya 2018-09-04
9817369 Mechanical component, mechanical component manufacturing method, movement, and timepiece Sachiko Tanabe, Takashi Niwa 2017-11-14
9753433 Mechanical component, movement, and timepiece Sachiko Tanabe, Takashi Niwa 2017-09-05
9678477 Mechanical component, mechanical component manufacturing method, movement, and timepiece Sachiko Tanabe, Takashi Niwa 2017-06-13
9665069 Electric generator device, timepiece movement, and timepiece Yoshiki Hamatani, Takashi Niwa, Miei Konishi, Toru Ozaki 2017-05-30
9640275 One-time memory control apparatus Katsuyuki Sumimoto, Junya Sasaki, Akio Kamimurai, Keisuke Katsurada 2017-05-02
9568887 Operation stabilizing mechanism, movement, and mechanical timepiece Takuma Kawauchiya, Takashi Niwa, Masayuki Koda 2017-02-14
9235193 Temperature compensation-type balance, timepiece movement, mechanical timepiece and manufacturing method of temperature compensation-type balance Takashi Niwa, Takuma Kawauchiya, Hisashi Fujieda, Manabu Shinke 2016-01-12
9188956 Balance, timepiece movement, timepiece and manufacturing method of balance Takashi Niwa, Takuma Kawauchiya 2015-11-17
9164486 Operation stabilization mechanism, movement, and mechanical timepiece Takuma Kawauchiya, Takashi Niwa, Masayuki Koda 2015-10-20
9128465 Balance with hairspring, movement, and timepiece Takuma Kawauchiya, Takashi Niwa 2015-09-08