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For the Inventor, By the Inventor

Yokohama, Japan

Kazutoshi Hirohashi

This inventor holds 15 USPTO granted patents. Top assignees: Victor Company of Japan, Limited, Ntt Data Communications Systems Corporation, Nit Data Communications Victor Company of Japan. Active years: 1985-2009.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Kazutoshi Hirohashi. Retrieved from https://idiyas.com/inventor/kazutoshi-hirohashi

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

USPTO Granted Patents = 15

% Patents Active = 93.3

Average Co-Inventor Count = 2.9

ph-index = 8

Forward Citations = 177(Granted Patents)


Location History:

  • Yokohama, JP (1985 - 1999)
  • Kanagawa, JP (2005)
  • Kanagawa-ken, JP (2009)

Company Filing History:

goldMedal14 out of 2,887 
 
Victor Company of Japan, Limited
 patents
silverMedal2 out of 15 
 
Ntt Data Communications Systems Corporation
 patents
bronzeMedal1 out of 1 
 
Nit Data Communications Victor Company of Japan
 patent
4. 1 out of 1 
 
Ntt Data Comm. Sys.
 patent
5. 1 out of 13 
 
Systems, LLC
 patents
6. 1 out of 48 
 
Universidad Politécnica De Madrid
 patents
where one patent can have more than one assignee

Years Active: 1985-2009

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15 patents (USPTO):Explore Patents
1. 7526155 - Rotary joint (2009-04-28),
2. 6867929 - Light source device (2005-03-15),
3. 5959754 - Optical wireless communication system (1999-09-28),
4. 5926302 - Bi-directional optical wireless communication apparatus and method of (1999-07-20),
5. 5600471 - Optical wireless data transmission system and optical wireless data (1997-02-04),
6. 5532858 - Optical radio transmission system and a method for adjusting optical (1996-07-02),
7. 5349463 - Optical radio repeater with signal quality detection (1994-09-20),
8. 5289306 - Repeater system (1994-02-22),
9. 4698693 - Audio magnetic recording and/or reproducing apparatus utilizing (1987-10-06),
10. 4614910 - Quarternary differential PSK demodulator (1986-09-30),
11. 4577161 - Noise reduction by linear interpolation using a dual function amplifier (1986-03-18),
12. 4574390 - Noise reduction for stereophonic FM signals by high-speed sampling and (1986-03-04),
13. 4539527 - Noise reduction by linear interpolation using a dual function amplifier (1985-09-03),
14. 4532475 - Impulse noise reduction by linear interpolation having a deemphasis (1985-07-30),
15. 4531095 - Impulse noise reduction by linear interpolation having immunity to white (1985-07-23),

Title: Kazutoshi Hirohashi: Innovator in Optical Technology

Introduction

Kazutoshi Hirohashi is a prominent inventor based in Yokohama, Japan. He has made significant contributions to the field of optical technology, holding a total of 15 patents. His work focuses on advancements that enhance the transmission of light signals and improve the safety and efficiency of light source devices.

Latest Patents

Hirohashi's latest patents include a revolutionary rotary joint designed to stably transmit superfine images and high-speed data. This rotary joint consists of a stationary part and a rotary part that rotates about an axis, facilitating the transmission of light signals. The rotary part features at least one light transmissive cylindrical member, along with a light emitting element and a light receiving element. The stationary part is equipped with corresponding light elements that work in tandem with the rotary part. Another notable invention is a light source device that is safe for human eyes and allows for high-speed switching. This device incorporates one or more laser light sources, a diffuser for light beam diffusion, and an optical collimator to collimate the emitted light bundle.

Career Highlights

Throughout his career, Kazutoshi Hirohashi has worked with notable companies, including the Victor Company of Japan, Limited and NTT Data Communications Systems Corporation. His experience in these organizations has contributed to his expertise in optical technologies and innovations.

Collaborations

Hirohashi has collaborated with esteemed colleagues such as Yukinobu Ishigaki and Takaaki Takeda. Their joint efforts have further advanced the field of optical technology and have led to the development of groundbreaking inventions.

Conclusion

Kazutoshi Hirohashi is a distinguished inventor whose work in optical technology has led to significant advancements in the field. His innovative patents and collaborations highlight his commitment to enhancing the transmission of light signals and improving light source safety.

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]
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