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USPTO Patent Rankings Data through Dec 31, 2025
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Keiichi Kitamura — 20 Patents

Denso: 7 patents #1,924 of 11,792Top 20%
NCNippondenso Co.: 6 patents #366 of 3,479Top 15%
TITokai Rubber Industries: 2 patents #181 of 557Top 35%
Hitachi: 2 patents #13,405 of 28,497Top 50%
NDNtt Docomo: 1 patents #1,030 of 1,706Top 65%
MCMitsumi Electric Co.: 1 patents #527 of 935Top 60%
SCSumitomo Chemical: 1 patents #2,469 of 4,033Top 65%
Osaka, JP: #2,116 of 24,344 inventorsTop 9%
Overall (All Time): #214,803 of 4,157,543Top 6%
20 Patents All Time
Keiichi Kitamura has been granted 20 US patents while listed as an inventor at Denso. The first was granted in 1990 and the most recent in January 2025. Keiichi Kitamura ranks #214,803 of 4,157,543 US inventors in our database (top 5.2%). Patent records list Keiichi Kitamura in Osaka, JP.

Patents per Year

Patents granted per year, 1990 to 2025Bar chart with a peak of 4 patents in 1994.peak 41990: 1 patents19901991: 1 patents1994: 4 patents19941995: 1 patents1996: 1 patents19962001: 1 patents2002: 2 patents20022003: 2 patents2004: 1 patents20042005: 1 patents2006: 2 patents20062014: 1 patents2016: 1 patents20162025: 1 patents2025

Issued Patents All Time

Showing 1–20 of 20 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
12213376 Organic photoelectric conversion material Yuta ISHINO, Tomoya KASHIKI, Shohei Matsushita 2025-01-28
9523518 Refrigeration cycle device Shiho Hashimoto, Mitsuyoshi Tanaka, Junichi Ono 2016-12-20
8749204 Battery condition detector, battery pack including same, and battery condition detecting method Yoshihide Majima, Kazuhiko Takeno, Yasuyuki Kanai, Haruo Uemura 2014-06-10 $119,000
7121103 Vehicle air conditioning system Satoshi Itoh, Toshinobu Homan 2006-10-17
7040117 Gas-liquid separator and ejector refrigerant cycle using the same Shin Nishida, Yoshitaka Tomatsu 2006-05-09 $597,000
6857286 Vapor-compression refrigerant cycle system Hiromi Ohta, Motohiro Yamaguchi 2005-02-22 $222,000
6708512 Vehicle air conditioner with cold accumulator Yuichi Shirota, Koji Takahashi 2004-03-23
6640568 Vehicle air conditioner with arrangement of temperature detector Yuichi Shirota, Koji Takahashi 2003-11-04
6530239 Refrigeration system Tetsuji Nobuta 2003-03-11
6439268 Fluid-impermeable composite hose Nobuaki Niki, Masanobu Ohnishi, Makoto Yoshino 2002-08-27
6345647 Fluid-impermeable composite hose Nobuaki Niki, Masanobu Ohnishi, Makoto Yoshino 2002-02-12
6316983 Predistortion circuit — 2001-11-13
5490397 Water removing device in refrigerating system Shin Honda, Hisayoshi Sakakibara 1996-02-13
5448899 Refrigerant evaporator Toshio Ohara, Yoshiyuki Yamauchi, Masahiro Shimoya, Etuo Hasegawa, Keiichi Yoshii +4 more 1995-09-12
5376898 Semiconductor integrated circuit device Hiroyuki Tanaka, Yasushi Hatta, Tatsuya Kouketsu, Yasushi Takahashi, Kyosuke Ishikawa 1994-12-27 $78,000
5367883 Refrigeration system Hisayoshi Sakakibara, Shin Honda 1994-11-29
5359862 Method and apparatus for detecting an amount of cooling medium charged in a refrigeration circulation system Hisao Nagashima, Hideaki Sato, Shin Honda 1994-11-01
5301520 Water removing device in refrigerating system Shin Honda, Hisayoshi Sakakibara, Masashi Honda 1994-04-12
4998413 Refrigerant recovery system Hideaki Sato, Hisao Nagashima, Kenichi Fujiwara 1991-03-12
4968904 MESFET circuit with threshold-compensated source-follower output Kiichi Yamashita, Nobuo Kotera, Yasushi Hatta, Hiroyuki Tanaka 1990-11-06 $72,000

Frequent Collaborators

Hisayoshi Sakakibara4 shared
Shin Honda4 shared
Hiroyuki Tanaka2 shared
Hideaki Sato2 shared
Koji Takahashi2 shared
Nobuaki Niki2 shared

Nearby-Ranked Inventors

Anthony Mertes20
Ed Merjanian20
Arthur J. Higby20
Daniel Rosenberg20
Anthony J. Kuschel20
Mark E. Fauver20
Markus Wintermantel20
Dominik Schnieders20
Christopher P. Roche20