logo

For the Inventor, By the Inventor

Anjo, Japan

Hiroaki Yamaguchi

This inventor holds 59 USPTO granted patents and 2 EPO patents, primarily in Internal Combustion Engines (CPC class 1231). Top assignees: Nippon Soken, Inc., Toyota Jidosha Kogyo Kabushiki Kaisha, Nippondenso Co., Ltd.. Active years: 1976-2019.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Hiroaki Yamaguchi. Retrieved from https://idiyas.com/inventor/hiroaki-yamaguchi

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

USPTO Granted Patents = 59

% Patents Active = 96.6


Average Co-Inventor Count = 3.1

ph-index = 17

Forward Citations = 738(Granted Patents)

Forward Citations (Not Self Cited) = 727(Dec 10, 2025)


Inventors with similar research interests:


Location History:

  • Anjo, JA (1976 - 1977)
  • Nakata, JP (1978)
  • Aichi, JA (1978)
  • Nukata, JA (1978)
  • Nukata, JP (1980)
  • Anjo, JP (1978 - 1996)
  • Aichi, JP (1978 - 2013)
  • Novi, MI (US) (2018 - 2019)

Company Filing History:

goldMedal50 out of 1,600 
 
Nippon Soken, Inc.
 patents
silverMedal12 out of 1,838 
 
Toyota Jidosha Kogyo Kabushiki Kaisha
 patents
bronzeMedal6 out of 3,252 
 
Nippondenso Co., Ltd.
 patents
4. 5 out of 2,030 
 
Kabushiki Kaisha Tokai Rika Denki Seisakusho
 patents
5. 2 out of 68 
 
Tram, Inc.
 patents
where one patent can have more than one assignee

Years Active: 1976-2019

Loading Chart...
Loading Chart...
Areas of Expertise:
Ignition Timing Control
Knock Detection
Vibration Sensing
Spark Plug
Rotary Switch
Electric Control
Torque Detection
Feedback Systems
Acoustic Wave Detection
Hysteresis Characteristics
59 patents (USPTO):Explore Patents
1. 10379368 - Rotary dial assembly (2019-08-13),
2. 9881752 - Rotary-type switch (2018-01-30),
3. 8579141 - Fitting structure for two members (2013-11-12),
4. 7682189 - Dummy connector (2010-03-23),
5. 6759615 - Switch device (2004-07-06),
6. 5567874 - Rotary position detecting device (1996-10-22),
7. 5544000 - Electric control apparatus (1996-08-06),
8. 5529296 - Pedal return device having improved hysteresis characteristics (1996-06-25),
9. 4658650 - Vibration and acoustic wave detecting device employing a piezoelectric (1987-04-21),
10. 4574616 - Vibration detecting apparatus (1986-03-11),
11. 4466405 - Feedback type ignition timing control system for internal combustion (1984-08-21),
12. 4465047 - Knock detecting apparatus for combustion engines (1984-08-14),
13. 4462247 - Knock detecting apparatus for internal combustion engines (1984-07-31),
14. 4452069 - Method of and apparatus for sensing knocking in internal combustion (1984-06-05),
15. 4439708 - Spark plug having dual gaps (1984-03-27),

Title: Hiroaki Yamaguchi: A Pioneer in Rotary Dial Innovations

Introduction

Hiroaki Yamaguchi is a renowned inventor based in Anjo, Japan, known for his significant contributions to rotary dial technology. With an impressive portfolio of 59 patents, Yamaguchi has established himself as a leading figure in the field of innovations related to user interface devices. His inventive spirit has paved the way for advanced functionalities in various applications, particularly in automotive lighting controls.

Latest Patents

Among Yamaguchi's latest inventions is the **Rotary Dial Assembly**, which features a rotary dial capable of selectively displaying multiple graphical images. This assembly integrates a polarized film to control the visibility of these images, enhancing user interface interactions. When the dial is rotated, the polarized film is illuminated, thereby presenting at least one of the graphical visuals.

Another notable patent is his **Rotary-type Switch**, designed specifically for vehicle lighting control. This switch consists of a housing with several positions corresponding to different operation modes. The rotary dial can rotate relative to this housing, allowing users to select the desired operation mode. An innovative feature of this switch is its controller, which ensures that the operation mode defaults to a predetermined initial mode when the vehicle's power is off, offering reliability and ease of use for drivers.

Career Highlights

Hiroaki Yamaguchi has held pivotal roles in esteemed companies such as Nippon Soken, Inc. and Toyota Motor Corporation. During his tenure, he has demonstrated unparalleled expertise in developing cutting-edge technologies that enhance user experiences in various devices.

Collaborations

Throughout his career, Yamaguchi has collaborated with talented individuals in the industry, including notable coworkers Tadashi Hattori and Yoshinori Ootsuka. These partnerships have undoubtedly contributed to the creativity and innovation that define his work.

Conclusion

Hiroaki Yamaguchi's commitment to advancing rotary dial technology is evident through his extensive patent portfolio. His innovative designs and practical solutions have not only transformed user interactions in automotive applications but also positioned him as a respected inventor in the technological community. As Yamaguchi continues to push the boundaries of innovation, his work will surely inspire future generations of inventors.

Profile summary based on public USPTO records.
Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
Loading…