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For the Inventor, By the Inventor

Cupertino, CA, United States of America

Shigekazu Yamada

This inventor holds 15 USPTO granted patents, primarily in Nonvolatile Memory Technology. Top assignees: Fujitsu Corporation, Fasl LLC, Advanced Micro Devices Corporation. Active years: 2000-2007.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Shigekazu Yamada. Retrieved from https://idiyas.com/inventor/shigekazu-yamada-g9v8a4vy

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

Calculating rank
USPTO Granted Patents = 15

% Patents Active = 93.3

Average Co-Inventor Count = 1.4

ph-index = 10

Forward Citations = 299(Granted Patents)


Location History:

  • Kunitachi, JP (2003)
  • Cupertino, CA (US) (2000 - 2005)
  • Kawasaki, JP (2005 - 2007)

Company Filing History:

goldMedal10 out of 39,378 
 
Fujitsu Corporation
 patents
silverMedal2 out of 30 
 
Fasl LLC
 patents
bronzeMedal1 out of 13,185 
 
Advanced Micro Devices Corporation
 patents
4. 3 out of 834,601 
Other
 patents
where one patent can have more than one assignee

Years Active: 2000-2007

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Areas of Expertise:
Nonvolatile Memory
Flash Memory
Voltage Regulation
Memory Programming
Threshold Voltage
Semiconductor Device
Page Read
Page Write
Temperature Reference
High Voltage Comparator
Memory Voltage
Current Tracking
15 patents (USPTO):Explore Patents
1. 7280413 - Nonvolatile semiconductor memory (2007-10-09),
2. 6944057 - Method to obtain temperature independent program threshold voltage distribution using temperature dependent voltage reference (2005-09-13),
3. 6912160 - Nonvolatile semiconductor memory device (2005-06-28),
4. 6859393 - Ground structure for page read and page write for flash memory (2005-02-22),
5. 6839279 - Nonvolatile semiconductor memory device (2005-01-04),
6. 6816423 - System for control of pre-charge levels in a memory device (2004-11-09),
7. 6781884 - System for setting memory voltage threshold (2004-08-24),
8. 6621742 - System for programming a flash memory device (2003-09-16),
9. 6594181 - System for reading a double-bit memory cell (2003-07-15),
10. 6542409 - System for reference current tracking in a semiconductor device (2003-04-01),
11. 6438041 - Negative voltage regulation (2002-08-20),
12. 6400638 - Wordline driver for flash memory read mode (2002-06-04),
13. 6324108 - Application of external voltage during array VT testing (2001-11-27),
14. 6208564 - High voltage comparator (2001-03-27),
15. 6147906 - Method and system for saving overhead program time in a memory device (2000-11-14),

Title: Shigekazu Yamada: Innovator in Nonvolatile Semiconductor Memory

Introduction

Shigekazu Yamada is a prominent inventor based in Cupertino, California, known for his significant contributions to the field of semiconductor memory technology. With a total of 15 patents to his name, Yamada has made remarkable advancements that enhance the efficiency and performance of memory devices.

Latest Patents

Among his latest patents, Yamada has developed a nonvolatile semiconductor memory that features a transmission transistor connected to an electrically rewritable nonvolatile memory cell. This innovative design includes an operation control circuit that manages the program operation to increase the threshold voltage of the memory cell. Additionally, it incorporates a drain switching circuit that optimizes the verify operation by connecting the gate of the transmission transistor to a first voltage line during verification and to a second voltage line during programming. This method significantly reduces the data write time to the memory cell. Another notable patent involves a method to obtain temperature-independent program threshold voltage distribution using a temperature-dependent voltage reference. This method ensures that the gate voltage applied to the memory device remains consistent, regardless of temperature fluctuations, thereby providing a stable programming time.

Career Highlights

Yamada has had a distinguished career, having worked with Fujitsu Corporation, where he honed his skills in semiconductor technology. His work has been instrumental in advancing the capabilities of memory devices, making them more efficient and reliable.

Collaborations

Throughout his career, Yamada has collaborated with notable professionals in the field, including Colin Stewart Bill and Tien-Chun Yang. These collaborations have contributed to the innovative solutions he has developed.

Conclusion

Shigekazu Yamada's contributions to semiconductor memory technology have had a lasting impact on the industry. His innovative patents and collaborative efforts continue to shape the future of memory devices, ensuring they meet the demands of modern technology.

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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