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For the Inventor, By the Inventor

Tokyo, Japan

Takahiko Urai

This inventor holds 13 USPTO granted patents. Top assignee: Nec Corporation. Active years: 1989-1999.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Takahiko Urai. Retrieved from https://idiyas.com/inventor/takahiko-urai

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

Calculating rank
USPTO Granted Patents = 13

% Patents Active = 100.0

Average Co-Inventor Count = 1.0

ph-index = 9

Forward Citations = 177(Granted Patents)


Company Filing History:

goldMedal13 out of 36,770 
 
Nec Corporation
 patents

Years Active: 1989-1999

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13 patents (USPTO):Explore Patents
1. 5892715 - Non-volatile semiconductor memory device with variable source voltage (1999-04-06),
2. 5798547 - Non-volatile semiconductor memory device having NAND structure cells (1998-08-25),
3. 5732019 - Initialization of electrically erasable non-volatile semiconductor (1998-03-24),
4. 5684747 - Method for erasing nonvolatile semiconductor memory device incorporating (1997-11-04),
5. 5484742 - Process for preparing a semiconductor device with a narrow-channel MOS (1996-01-16),
6. 5396499 - Semiconductor memory device with redundant memory and floatable data line (1995-03-07),
7. 5347486 - Nonvolatile memory device having self-refresh function (1994-09-13),
8. 5018104 - Redundant circuit incorporated in semiconductor memory device (1991-05-21),
9. 4954729 - Output buffer circuit used for stable voltage source (1990-09-04),
10. 4908798 - Semiconductor memory device with memory cell arrays and a redundant (1990-03-13),
11. 4905197 - Semiconductor memory having circuitry for discharging a digit line (1990-02-27),
12. 4881200 - Erasable programmable read only memory device (1989-11-14),
13. 4855956 - Semiconductor memory device with improved cell arrangement (1989-08-08),

Title: Takahiko Urai: Innovator in Semiconductor Memory Technology

Introduction

Takahiko Urai is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of semiconductor memory technology, holding a total of 13 patents. His work focuses on enhancing the efficiency and functionality of non-volatile memory devices.

Latest Patents

Among his latest innovations is a non-volatile semiconductor memory device with a variable source voltage. This device features a memory cell array composed of multiple non-volatile memory cells, organized into blocks. Each block is monitored during erase operations to generate an erase operation history, which informs the control signals for writing operations. Another notable patent involves a non-volatile semiconductor memory device utilizing NAND structure cells. This design includes multiple memory cell arrays with NAND structures, allowing for efficient word line-by-line erasure of stored data.

Career Highlights

Takahiko Urai is currently employed at NEC Corporation, where he continues to develop cutting-edge memory technologies. His expertise in semiconductor devices has positioned him as a key figure in the industry, contributing to advancements that enhance data storage solutions.

Collaborations

Takahiko collaborates with fellow inventor Masayoshi Hirata, working together to push the boundaries of semiconductor technology. Their combined efforts have led to innovative solutions that address the evolving needs of the tech industry.

Conclusion

Takahiko Urai's contributions to semiconductor memory technology exemplify his dedication to innovation. His patents reflect a commitment to improving data storage solutions, making a lasting impact in the field.

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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