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Nippon Densan Corporation

USPTO Granted Patents = 51

Trademarks = 1

Forward Citations = 980

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58 inventors (with patents filed for the assignee):

Hiroyuki Yonei (10 out of 14 patents)

Kihachiro Ohta (7 out of 7 patents)

Itsuo Miyaji (7 out of 7 patents)

4. Kuniyasu Iwazaki (5 out of 5 patents)

5. Isao Kaneda (5 out of 9 patents)

6. Noriaki Hishida (4 out of 4 patents)

7. Takeshi Uda (4 out of 4 patents)

8. Masanobu Chuta (4 out of 4 patents)

9. Fumihiro Morikawa (4 out of 4 patents)

10. Yoichi Mori (3 out of 4 patents)

11. Yosuke Kawate (3 out of 3 patents)

12. Shuji Takahashi (3 out of 7 patents)

13. Shinobu Hattori (3 out of 3 patents)

14. Kiyoyoshi Takegami (3 out of 3 patents)

15. Toshio Fukuda (2 out of 12 patents)

Core Competencies:

Spindle Motor

Battery Charger

Brushless DC Motor

Magnetic Fluid Seal

Torque Transducer

Low Profile Apparatus

Fan Motor

Micropump

Motor Drive Control

Sensorless Motor

Electromagnetic Interference

Disk Clamping

51 patents: Sort by Forward Citations

1. 5484013 - Heat sink fan (1996-01-16),

2. 5475294 - Charge controller for battery charger (1995-12-12),

3. 5459361 - Spindle motor (1995-10-17),

4. 5457588 - Low profile hydrodynamic motor having minimum leakage properties (1995-10-10),

5. 5453890 - Low airflow hard disk apparatus (1995-09-26),

6. 5452156 - Spindle motor with combined pressure relief and adhesive carrying (1995-09-19),

7. 5436519 - Fan motor (1995-07-25),

8. 5428284 - Method of and circuit for starting sensorless motor (1995-06-27),

9. 5426548 - Disk clamping assembly for a low profile disk drive apparatus (1995-06-20),

10. 5412367 - Transformer (1995-05-02),

11. 5402023 - Spindle motor and magnetic fluid seal apparatus used therefor (1995-03-28),

12. 5396159 - Method of starting a motor (1995-03-07),

13. 5396135 - Motor (1995-03-07),

14. 5381066 - Spindle motor with a sealing member (1995-01-10),

15. 5365458 - Motor eccentricity measuring apparatus (1994-11-15),

Nippon Densan Corporation, headquartered in Kyoto, Japan, specializes in advanced motor technology, focusing on the development and manufacturing of various motor systems and components. The company is known for its expertise in spindle motors, brushless DC motors, and fan motors, catering to diverse applications across industries. Additionally, Nippon Densan is involved in innovative technologies such as magnetic fluid seals, torque transducers, and micropumps, positioning itself as a key player in the motor technology sector.

Profile summary based on public USPTO records.

Company Badge

USPTO Data Jan 1 1976 - Sep 29 2026

51 Patents

#62 in Kyoto

#1,684 in Japan

#13,753 in the World

Nippon Densan Corporation

Forward Citations = 980

58 inventors:

Hiroyuki Yonei (10 out of 14 patents)

Kihachiro Ohta (7 out of 7 patents)

Itsuo Miyaji (7 out of 7 patents)

4. Kuniyasu Iwazaki (5 out of 5 patents)

5. Isao Kaneda (5 out of 9 patents)

Please report any incorrect information to [email protected]

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