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For the Inventor, By the Inventor

Tokyo, Japan

Hitachi Ulsi Engineering Corp.

Calculating rank
USPTO Granted Patents = 87

% Expired Patents = 5.7


Forward Citations = 2,376

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308 inventors (with patents filed for the assignee):

goldMedal Shooji Kubono (10 out of 23 patents)

silverMedal Hitoshi Miwa (9 out of 64 patents)

bronzeMedal Osamu Tsuchiya (8 out of 44 patents)

4.  Hitoshi Tanaka (8 out of 59 patents)

5.  Tatsuya Ishii (7 out of 97 patents)

6.  Kiyoshi Matsubara (6 out of 62 patents)

7.  Kunihiro Komiyaji (6 out of 8 patents)

8.  Koichiro Ishibashi (5 out of 176 patents)

9.  Shuji Ikeda (5 out of 142 patents)

10.  Yasushi Akao (5 out of 52 patents)

11.  Keiichi Yoshida (5 out of 47 patents)

12.  Takeshi Wada (5 out of 42 patents)

13.  Shumpei Kawasaki (5 out of 27 patents)

14.  Sadayuki Morita (5 out of 21 patents)

15.  Shoji Kubono (5 out of 35 patents)


Core Competencies:
Nonvolatile Memory
Semiconductor Memory
Integrated Circuit
Dynamic RAM
Data Processing
Flash Memory
Microcomputer
Memory System
Sense Amplifier
Memory Device
Voltage Converter
Parallel Processor

87 patents:

1. 7145805 - Nonvolatile memory system, semiconductor memory, and writing method (2006-12-05),
2. 7072222 - Nonvolatile memory system, semiconductor memory and writing method (2006-07-04),
3. 7023071 - Semiconductor integrated circuit device and process for manufacturing the same (2006-04-04),
4. 7022568 - Semiconductor integrated circuit device and process for manufacturing the same (2006-04-04),
5. 6906952 - Nonvolatile semiconductor memory device and data writing method therefor (2005-06-14),
6. 6873552 - Nonvolatile memory system, semiconductor memory, and writing method (2005-03-29),
7. 6163485 - Semiconductor integrated circuit data processing system (2000-12-19),
8. 6157573 - Nonvolatile memory system, semiconductor memory, and writing method (2000-12-05),
9. 6134148 - Semiconductor integrated circuit and data processing system (2000-10-17),
10. 6121681 - Semiconductor device (2000-09-18),
11. 612168 - Semiconductor device (2000-09-19),
12. 6115319 - Dynamic RAM having word line voltage intermittently boosted in (2000-09-05),
13. 6097663 - Semiconductor IC device having a memory and a logic circuit implemented (2000-08-01),
14. 6097081 - Semiconductor device having adhesive between lead and chip (2000-08-01),
15. 6091640 - Semiconductor integrated circuit with multiple write operation modes (2000-07-18),
Company Overview
Hitachi Ulsi Engineering Corp., based in Tokyo, Japan, specializes in the development and manufacturing of advanced semiconductor memory solutions. The company focuses on nonvolatile memory technologies, including flash memory and dynamic RAM, which are integral to modern data processing and microcomputer systems. With a strong emphasis on integrated circuit design and memory systems, Hitachi Ulsi Engineering plays a crucial role in enhancing the performance and efficiency of electronic devices across various industries.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Nov 3 2026

87 Patents

#595 in Tokyo

#1,230 in Japan

#8,784 in the World

Tokyo, JP
Tokyo, Japan

Hitachi Ulsi Engineering Corp.

Forward Citations = 2,376

308 inventors:

goldMedal Shooji Kubono (10 out of 23 patents)

silverMedal Hitoshi Miwa (9 out of 64 patents)

bronzeMedal Osamu Tsuchiya (8 out of 44 patents)

4.  Hitoshi Tanaka (8 out of 59 patents)

5.  Tatsuya Ishii (7 out of 97 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Hitachi Ulsi Engineering Corp.. Retrieved from https://idiyas.com/company/hitachi-ulsi-engineering

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

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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