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For the Inventor, By the Inventor

Tokyo, Japan

Keiji Hosotani

This inventor holds 61 USPTO granted patents and 2 published patent applications, primarily in Semiconductor Memory Devices (CPC class H01L). Top assignees: Kabushiki Kaisha Toshiba, Toshiba Memory Corporation, Kioxia Corporation. Active years: 1999-2026.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Keiji Hosotani. Retrieved from https://idiyas.com/inventor/keiji-hosotani

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

USPTO Granted Patents = 61 

% Patents Active = 72.1

Average Co-Inventor Count = 2.2

ph-index = 13

Forward Citations = 595(Granted Patents)

Forward Citations (Not Self Cited) = 554(Dec 10, 2025)


Inventors with similar research interests:


Location History:

  • Tokyo, JP (2003 - 2008)
  • Sagamihara, JP (2010 - 2013)
  • Palo Alto, CA (US) (2013)
  • Yokohama, JP (1999 - 2014)
  • Seoul, KR (2016 - 2019)
  • Mie, JP (2020 - 2022)
  • Yokkaichi Mie, JP (2019 - 2023)
  • Yokkaichi, JP (2023)

Company Filing History:

goldMedal46 out of 53,262 
 
Kabushiki Kaisha Toshiba
 patents
silverMedal8 out of 2,955 
 
Toshiba Memory Corporation
 patents
bronzeMedal6 out of 3,189 
 
Kioxia Corporation
 patents
4. 1 out of 11,659 
 
Skhynix Inc.
 patents
5. 1 out of 834,513 
Other
 patents
where one patent can have more than one assignee

Years Active: 1999-2026

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Areas of Expertise:
Semiconductor Memory Device
Magnetic Random Access Memory
Magnetoresistive Element
Non-Volatile Memory
Resistance Change Memory
Memory Cell
Manufacturing Method
Testing Method
Integrated Circuit Device
Magnetic Memory Device
Data Read Method
Memory Storage
61 patents (USPTO):Explore Patents
1. 12745393 - Semiconductor memory device (2026-09-22),
2. 12610542 - Semiconductor memory device (2026-04-21),
3. 12376308 - Semiconductor memory device (2025-07-29),
4. 11647628 - Semiconductor memory device (2023-05-09),
5. 11646354 - Semiconductor device and semiconductor storage device (2023-05-09),
6. 11610910 - Semiconductor memory device (2023-03-21),
7. 11227832 - Semiconductor memory device having a memory cell and semiconductor layer (2022-01-18),
8. 11107508 - Semiconductor memory device (2021-08-31),
9. 11074944 - Semiconductor memory device (2021-07-27),
10. 10868037 - Non-volatile semiconductor memory device (2020-12-15),
11. 10622545 - Magnetic memory device and method of manufacturing the same (2020-04-14),
12. 10410704 - Memory device (2019-09-10),
13. 10311929 - Resistance change memory (2019-06-04),
14. 9799383 - Magnetic memory device (2017-10-24),
15. 9653182 - Testing method, manufacturing method, and testing device of memory device (2017-05-16),

Title: Innovator Spotlight: Keiji Hosotani, Tokyo's Prolific Inventor

Introduction:

Keiji Hosotani is a distinguished inventor hailing from Tokyo, Japan, known for his groundbreaking work in the field of semiconductor technology. With a remarkable total of 58 patents to his name, Keiji Hosotani has consistently pushed the boundaries of innovation in the tech industry.

Latest Patents:

Among his latest patents is the groundbreaking "Semiconductor memory device," introducing a novel architecture that enhances memory cell efficiency and performance. Another notable patent is the "Semiconductor device and semiconductor storage device," showcasing his expertise in developing cutting-edge semiconductor solutions for advanced electronics.

Career Highlights:

Keiji Hosotani has worked with renowned companies such as Toshiba and its subsidiary, Toshiba Memory Corporation, where he honed his skills and made significant contributions to the semiconductor industry. His innovative approaches have paved the way for next-generation technologies and have earned him a stellar reputation among his peers.

Collaborations:

Throughout his career, Keiji Hosotani has collaborated with esteemed colleagues, including Yoshiaki Asao and Tatsuya Kishi. Together, they have worked on various projects, shared insights, and collectively advanced the field of semiconductor technology with their combined expertise and innovative spirit.

Conclusion:

In conclusion, Keiji Hosotani stands out as a visionary inventor whose prolific work has left an indelible mark on the semiconductor industry. His dedication to innovation, coupled with his technical prowess, continues to inspire the next generation of inventors and engineers, shaping the future of technology in Japan and beyond.

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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