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For the Inventor, By the Inventor

Chiba, Japan

Kitz Corporation


USPTO Granted Patents = 91

% Expired Patents = 22.0



Trademarks = 31

Forward Citations = 561

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87 inventors (with patents filed for the assignee):

goldMedal Kazuhiro Aoki (8 out of 8 patents)

silverMedal Chikashi Gomi (7 out of 7 patents)

bronzeMedal Osamu Watanabe (6 out of 129 patents)

4.  Masazumi Funato (6 out of 6 patents)

5.  Tetsuya Watanabe (6 out of 89 patents)

6.  Kazuhito Kurose (6 out of 6 patents)

7.  Tomoyuki Ozasa (6 out of 6 patents)

8.  Hisanori Terui (5 out of 5 patents)

9.  Mitsuru Hosokawa (5 out of 6 patents)

10.  Takako Sakurai (4 out of 4 patents)

11.  Masahiro Kazama (4 out of 4 patents)

12.  Teruhiko Horigome (4 out of 4 patents)

13.  Masaru Yamazaki (4 out of 7 patents)

14.  Norikazu Sugaya (4 out of 4 patents)

15.  Yoshiharu Sato (4 out of 4 patents)


Core Competencies:
Butterfly Valve
Ball Valve
Fluid Purification
Valve Manufacturing
Trunnion Ball Valve
Pneumatic Actuator
Copper-Based Alloy
Valve Inspection
Pressure-Resistance Inspection
Hydrogen Station
Leadless Brass Alloy
Micro-Filtration

91 patents:

1. 12663084 - Sealing member, sealing mechanism, valve, and sealing method (2026-06-23),
2. 12565941 - Valve (2026-03-03),
3. 12379035 - Valve, and method for manufacturing said valve (2025-08-05),
4. 12276949 - Valve state grasping system, display device and rotary valve, valve state grasping program, recording medium, and valve state grasping method (2025-04-14),
5. 12139430 - Wash water processing apparatus and sterilization and water-purification apparatus, and wash water processing method (2024-11-12),
6. 12135098 - Valve (2024-11-05),
7. 12092224 - Lined butterfly valve and method for manufacturing lined butterfly valve (2024-09-17),
8. 12072064 - Hydrogen gas filling method and hydrogen station (2024-08-27),
9. 11982360 - Double eccentric butterfly valve and manufacturing method therefor (2024-05-14),
10. 11975995 - Wash water processing apparatus and sterilization and purification unit, and wash water processing method of semiconductor element or liquid-crystal glasses (2024-05-07),
11. 11892097 - Valve state grasping system using motion sensor fixed to valve stem (2024-02-06),
12. 11761556 - Valve wear state grasping method and system using valve stem angular velocity (2023-09-19),
13. 11732807 - Eccentric butterfly valve (2023-08-22),
14. 11703129 - Valve disk of double eccentric butterfly valve, and double eccentric butterfly valve (2023-07-18),
15. 11698137 - Centric butterfly valve (2023-07-11),
KITZ CORPORATION is a leading manufacturer of industrial valves and fittings. With over 70 years of expertise, KITZ offers a wide range of high-quality products for various industries including oil and gas, chemical, power, and water treatment. Their innovative solutions and commitment to customer satisfaction have made them a reliable partner worldwide.
This text is generated by artificial intelligence and may not be accurate.

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USPTO Data Jan 1 1976 - Sep 15 2026

Kitz Corporation
91 Patents

#16 in Chiba

#1,193 in Japan

#8,424 in the World

Chiba, JP
Chiba, Japan

Kitz Corporation

Forward Citations = 561

87 inventors:

goldMedal Kazuhiro Aoki (8 out of 8 patents)

silverMedal Chikashi Gomi (7 out of 7 patents)

bronzeMedal Osamu Watanabe (6 out of 129 patents)

4.  Masazumi Funato (6 out of 6 patents)

5.  Tetsuya Watanabe (6 out of 89 patents)

Please report any incorrect information to [email protected]
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