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For the Inventor, By the Inventor

Ushiku, Japan

Kazumasa Kiyomi

This inventor holds 10 USPTO granted patents and 4 published patent applications. Top assignees: Mitsubishi Chemical Corporation, Tohoku University. Active years: 2001-2015.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Kazumasa Kiyomi. Retrieved from https://idiyas.com/inventor/kazumasa-kiyomi

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

Calculating rank
USPTO Granted Patents = 10 

% Patents Active = 50.0

Average Co-Inventor Count = 3.7

ph-index = 6

Forward Citations = 94(Granted Patents)


Location History:

  • Ibaraki-ken, JP (2010)
  • Ibaraki, JP (2012)
  • Ushiku, JP (2001 - 2015)

Company Filing History:

goldMedal10 out of 2,426 
 
Mitsubishi Chemical Corporation
 patents
silverMedal1 out of 1,052 
 
Tohoku University
 patents
where one patent can have more than one assignee

Years Active: 2001-2015

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10 patents (USPTO):Explore Patents
1. 9112096 - Method for producing group-III nitride semiconductor crystal, group-III nitride semiconductor substrate, and semiconductor light emitting device (2015-08-18),
2. 8269251 - Method for producing group III nitride semiconductor crystal, group III nitride semiconductor substrate, and semiconductor light-emitting device (2012-09-18),
3. 8142566 - Method for producing Ga-containing nitride semiconductor single crystal of BxAlyGazIn1-x-y-zNsPtAs1-s-t (0<=x<=1, 0<=y<1, 0<z<=1, 0<s<=1 and 0<=t<1) on a substrate (2012-03-27),
4. 7794541 - Gallium nitride-based material and method of manufacturing the same (2010-09-14),
5. 6807213 - Semiconductor optical device apparatus (2004-10-19),
6. 6744066 - Semiconductor device and method for manufacturing the same (2004-06-01),
7. 6707071 - Semiconductor light-emitting device (2004-03-16),
8. 6589807 - Semiconductor device and method for manufacturing the same (2003-07-08),
9. 6387721 - Semiconductor light-emitting device and manufacturing method for the same (2002-05-14),
10. 6265733 - Semiconductor device and method for manufacturing the same (2001-07-24),

Title: Kazumasa Kiyomi: Innovator in Semiconductor Technology

Introduction

Kazumasa Kiyomi is a prominent inventor based in Ushiku, Japan. He has made significant contributions to the field of semiconductor technology, particularly in the development of group-III nitride semiconductor crystals. With a total of 10 patents to his name, Kiyomi's work has had a substantial impact on the industry.

Latest Patents

Kiyomi's latest patents include a method for producing group-III nitride semiconductor crystals, substrates, and semiconductor light-emitting devices. This innovative method involves preparing a seed crystal with a non-polar plane and growing the group-III nitride semiconductor from this plane in a vapor phase. The growth process is designed to extend in the +C-axis direction of the seed crystal, resulting in a high-quality group III-V nitride semiconductor crystal with a large-area non-polar plane.

Career Highlights

Throughout his career, Kazumasa Kiyomi has worked with notable organizations such as Mitsubishi Chemical Corporation and Tohoku University. His expertise in semiconductor technology has positioned him as a key figure in advancing the field.

Collaborations

Kiyomi has collaborated with esteemed colleagues, including Kenji Shimoyama and Nobuyuki Hosoi. These partnerships have further enriched his research and development efforts in semiconductor technology.

Conclusion

Kazumasa Kiyomi's contributions to the field of semiconductor technology are noteworthy. His innovative methods and collaborations have paved the way for advancements in the production of high-quality semiconductor materials.

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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