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For the Inventor, By the Inventor

Tokyo, Japan

Memory-Tech Holdings Inc.

Calculating rank
USPTO Granted Patents = 19

% Expired Patents = 68.4


Forward Citations = 9

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15 inventors (with patents filed for the assignee):

goldMedal Takayuki Naka (15 out of 22 patents)

silverMedal Masahito Konishi (15 out of 20 patents)

bronzeMedal Masaki Yamamoto (15 out of 131 patents)

4.  Hirohisa Yamada (15 out of 47 patents)

5.  Hideharu Tajima (15 out of 80 patents)

6.  Yoshihisa Adachi (4 out of 47 patents)

7.  Hideki Kobayashi (2 out of 80 patents)

8.  Makoto Suzuki (2 out of 77 patents)

9.  Yoshihiro Takatani (2 out of 2 patents)

10.  Mitsuro Satoh (2 out of 2 patents)

11.  Masayoshi Tsuchiya (2 out of 17 patents)

12.  Takuya Shiroto (2 out of 2 patents)

13.  Masakazu Ogasawara (2 out of 56 patents)

14.  Masayoshi Yoshida (2 out of 81 patents)

15.  Takao Tagiri (2 out of 11 patents)


19 patents:

1. 11676634 - Method for playing back information recording medium (2023-06-13),
2. 10636445 - Information recording medium and reproduction device (2020-04-28),
3. 10381039 - Reproducing device (2019-08-13),
4. 10255941 - Optical disc having a plurality of recording layers (2019-04-09),
5. 10192581 - Reproducing device (2019-01-29),
6. 10068605 - Optical information recording medium having first and second pit row of identical reflectance (2018-09-04),
7. 10043545 - Information recording medium and reproduction device (2018-08-07),
8. 9978416 - Reproducing device (2018-05-22),
9. 9978415 - Optical information recording medium having first and second pit rows of identical reflectance (2018-05-22),
10. 9928868 - Optical disc having a plurality of recording layers (2018-03-27),
11. 9805761 - Reproducing device (2017-10-31),
12. 9767838 - Optical information recording medium and reproduction method (2017-09-19),
13. 9697863 - Information recording medium and reproduction device (2017-07-04),
14. 9666222 - Optical information recording medium having first and second pit row of identical reflectance (2017-05-30),
15. 9633688 - Reproducing device (2017-04-25),
Company Overview
Memory-Tech Holdings Inc. is a prominent player in the semiconductor industry, specializing in the development and manufacturing of advanced memory solutions. The company focuses on innovative technologies that enhance data storage and retrieval processes, catering to a diverse range of applications across various sectors. With its headquarters in Tokyo, Japan, Memory-Tech is committed to driving progress in memory technology, contributing to advancements in computing, telecommunications, and consumer electronics.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 27 2026

19 Patents

#1,381 in Tokyo

#3,041 in Japan

#32,705 in the World

Tokyo, JP
Tokyo, Japan

Memory-Tech Holdings Inc.

Forward Citations = 9

15 inventors:

goldMedal Takayuki Naka (15 out of 22 patents)

silverMedal Masahito Konishi (15 out of 20 patents)

bronzeMedal Masaki Yamamoto (15 out of 131 patents)

4.  Hirohisa Yamada (15 out of 47 patents)

5.  Hideharu Tajima (15 out of 80 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Memory-Tech Holdings Inc.. Retrieved from https://idiyas.com/company/memory-tech-holdings

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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