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For the Inventor, By the Inventor

Stanford, CA, United States of America

Takaaki Hagiwara

This inventor holds 22 USPTO granted patents, primarily in Semiconductor Memory. Top assignees: Hitachi, Ltd., Hitachi Microcomputer Engineering, Ltd., Hitachi Vlsi Engineering Corp.. Active years: 1981-1997.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Takaaki Hagiwara. Retrieved from https://idiyas.com/inventor/takaaki-hagiwara

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

USPTO Granted Patents = 22

% Patents Active = 100.0

Average Co-Inventor Count = 5.0

ph-index = 12

Forward Citations = 363(Granted Patents)


Location History:

  • Kodaira, JP (1981 - 1987)
  • Nishitama, JP (1986 - 1987)
  • Hirai, Hinode-machi, Nishitama-gun, Tokyo, JP (1994)
  • Hinode, JP (1990 - 1995)
  • Stanford, CA (US) (1986 - 1996)
  • Hinode-machi, JP (1997)

Company Filing History:

goldMedal21 out of 42,740 
 
Hitachi, Ltd.
 patents
silverMedal1 out of 149 
 
Hitachi Microcomputer Engineering, Ltd.
 patents
bronzeMedal1 out of 182 
 
Hitachi Vlsi Engineering Corp.
 patents
4. 1 out of 834,570 
Other
 patents
where one patent can have more than one assignee

Years Active: 1981-1997

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Areas of Expertise:
EPROM
Semiconductor Device
EEPROM
Nonvolatile Memory
Field Effect Transistors
Memory Driving Method
Stacked Memory
Integrated Circuit
Level Shift Circuit
Defect Remediation
Manufacturing Method
Self-Aligned Transistors
22 patents (USPTO):Explore Patents
1. 5604142 - Method of making an EPROM with peripheral transistor (1997-02-18),
2. 5519244 - Semiconductor device having aligned semiconductor regions and a (1996-05-21),
3. 5472891 - Method of manufacturing a semiconductor device (1995-12-05),
4. 5348898 - Semiconductor device and method for manufacturing the same (1994-09-20),
5. 5340760 - Method of manufacturing EEPROM memory device (1994-08-23),
6. 5252505 - Method for manufacturing a semiconductor device (1993-10-12),
7. 5189497 - Semiconductor memory device (1993-02-23),
8. 5114870 - Method for manufacturing field effect transistors (1992-05-19),
9. 5097446 - Nonvolatile semiconductor memory device (1992-03-17),
10. 5079603 - Semiconductor memory device (1992-01-07),
11. 4972371 - Semiconductor memory device (1990-11-20),
12. 4851364 - Method of forming well regions for field effect transistors utilizing (1989-07-25),
13. 4668970 - Semiconductor device (1987-05-26),
14. 4656607 - Electrically erasable programmable RAM (1987-04-07),
15. 4654828 - Nonvolatile semiconductor memory (1987-03-31),

Title: Takaaki Hagiwara: Innovator in Semiconductor Technology

Introduction

Takaaki Hagiwara, based in Stanford, CA, is a prominent inventor known for his pioneering work in semiconductor technology. With an impressive portfolio of 22 patents, he has made significant advancements that have propelled the efficiency and functionality of semiconductor devices.

Latest Patents

Among his latest innovations, Hagiwara has developed a method of making an EPROM with peripheral transistors. This invention discloses an EEPROM which enhances the erasing voltage applied during data write cycles. It does this by increasing the avalanche breakdown voltage between the source region and the semiconductor substrate to improve erasing efficiency. The structure employed strengthens the electric field at the edge of the drain region, enabling the generation of hot carriers to boost writing efficiency. Another noteworthy patent concerns a semiconductor device featuring aligned semiconductor regions, aimed at optimizing memory circuit design. This invention facilitates a more efficient memory array configuration, thereby reducing word line length and enhancing operational speeds, especially during reading.

Career Highlights

Hagiwara has worked with renowned companies such as Hitachi, Ltd. and Hitachi Microcomputer Engineering, Ltd., contributing to groundbreaking projects in the semiconductor field. His expertise and innovative mindset have played a pivotal role in the advancement of technology in these organizations.

Collaborations

During his career, Takaaki Hagiwara has collaborated with esteemed colleagues such as Yuji Yatsuda and Shinichi Minami. Their joint efforts have led to significant developments in semiconductor technology, resulting in patents that have shaped the industry.

Conclusion

Takaaki Hagiwara stands out as a key figure in semiconductor innovation, with a track record that showcases his commitment to enhancing technology through inventive solutions. His contributions continue to influence the design and efficiency of semiconductor devices, ensuring a lasting impact on the industry.

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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