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For the Inventor, By the Inventor

Kanasagou, Japan

Keijiro Sakai

USPTO Granted Patents = 19

Average Co-Inventor Count = 4.4

ph-index = 12

Forward Citations = 291(Granted Patents)


Location History:

  • Hitachi, JP (1983 - 1985)
  • Hitachiota, JP (1986 - 1991)
  • Hitachiohta, JP (1993)
  • Hitachioota, JP (1987 - 1995)
  • Kanasagou-machi, JP (2002)
  • Kuji, JP (2003)
  • Kanasagou, JP (2004 - 2005)
  • Kanasago, JP (2001 - 2010)

Company Filing History:

goldMedal19 out of 42,485 
 
Hitachi, Ltd.
 patents

Years Active: 1983-2010

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19 patents (USPTO):Explore Patents
1. 7777371 - Linear drive apparatus having cores and coils which are positioned on opposite sides of the cores (2010-08-17),
2. 7250696 - Linear motor and X-Y stage (2007-07-31),
3. 7004694 - Linear drive apparatus (2006-02-28),
4. 6844700 - Inverter apparatus (2005-01-18),
5. 6741063 - Inverter apparatus (2004-05-25),
6. 6657412 - Pulse width modulation method, pulse width modulator and power converter (2003-12-02),
7. 6496397 - Inverter device (2002-12-17),
8. 6229719 - Method of inverter control and apparatus of the same (2001-05-08),
9. 5475293 - Method for measuring characteristic constants of alternating current (1995-12-12),
10. 5184057 - Control method and device for AC motor (1993-02-02),
11. 5053690 - Control method of pulse width modulation inverter and pulse width (1991-10-01),
12. 5023538 - PWM inverter apparatus for controlling rotating magnetic flux in a.c. (1991-06-11),
13. 4688162 - Rectifier control apparatus with improved power factor (1987-08-18),
14. 4599549 - Method and apparatus for controlling PWM inverters (1986-07-08),
15. 4562524 - Control apparatus for PWM inverter (1985-12-31),

Title: Innovative Contributions of Keijiro Sakai

Introduction

Keijiro Sakai, located in Kanasagou, Japan, is a prolific inventor known for his significant contributions in the field of linear drive apparatus technology. With a total of 19 patents to his name, he has made strides in improving the efficiency and design of linear motors, enhancing their functionality and applicability.

Latest Patents

Among Sakai's latest inventions is a linear drive apparatus featuring cores and coils positioned on opposite sides of the cores. This invention addresses a common issue in conventional linear drive systems where the armature length increases with the number of phases used, thus restricting installation locations. His innovation includes multiple armature units formed from magnetic materials, implementing an arrangement that allows for opposing magnetic pole teeth to be interdigitated. Additionally, he has designed linear motors that facilitate linear motion through a combination of electromagnetic coils and magnetically permeable core structures, enabling smooth and efficient operation in various applications.

Career Highlights

Sakai is affiliated with Hitachi, Ltd., a company renowned for its technological advancements and innovations. His work in the development of linear motors has positioned him as a key figure in the industry, reflecting a commitment to continuous improvement and innovation in engineering and technology.

Collaborations

During his career, Keijiro Sakai has collaborated with notable colleagues, including Nobuyoshi Mutoh and Toshiaki Okuyama. Together, they have contributed to advancements in their respective fields, fostering a collaborative environment that promotes innovation and leads to transformative patent applications.

Conclusion

Keijiro Sakai's achievements in developing innovative linear drive systems exemplify his dedication to engineering excellence. His patents not only solve existing challenges but also pave the way for future advancements in motion technology, illustrating the profound impact of his work on the industry.

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