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Ddk Ltd.

USPTO Granted Patents = 140

% Expired Patents = 40.7

EPO Patents = 7

Trademarks = 6

Forward Citations = 1,147

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93 inventors (with patents filed for the assignee):

Masayuki A Suzuki (34 out of 157 patents)

Hirokazu Takahashi (29 out of 122 patents)

Hitoshi Kikuchi (16 out of 38 patents)

4. Kazunori Takei (15 out of 21 patents)

5. Kazuyuki Ozai (15 out of 17 patents)

6. Kazuhiro Sato (14 out of 79 patents)

7. Akio Yamada (12 out of 116 patents)

8. Yuki Nakano (12 out of 35 patents)

9. Hiromichi Kato (12 out of 12 patents)

10. Takanobu Yoshimi (11 out of 11 patents)

11. Takeki Fukazawa (11 out of 11 patents)

12. Takuya Higeta (10 out of 10 patents)

13. Yasuyuki Koguchi (9 out of 9 patents)

14. Harunori Urai (8 out of 8 patents)

15. Masato Hida (8 out of 8 patents)

Core Competencies:

Printed Wiring Board

Electric Connector

Card Connector

Electrical Connector

Flexible Circuit Board

Miniaturized Connector

Floating Connector

Connector Design

Power Supply Contact

Contact Configuration

Connector Manufacturing

Alignment Features

140 patents: Sort by Forward Citations

1. 10129978 - Printed wiring board (2018-11-13),

2. 10063016 - Fuse protected socket having additional attachment points (2018-08-28),

3. 10050379 - Connector (2018-08-14),

4. 9960534 - Connector (2018-05-01),

5. 9941649 - Interboard connection connector with battery connector (2018-04-10),

6. 9853382 - Connector (2017-12-26),

7. 9788426 - Printed wiring board (2017-10-10),

8. 9742086 - Printed wiring board and connector connecting the wiring board (2017-08-22),

9. 9705221 - Electronic component (2017-07-11),

10. 9673545 - Printed wiring board and connector connecting the wiring board (2017-06-06),

11. 9655241 - Printed wiring board and connector connecting the wiring board (2017-05-16),

12. 9653848 - Connector (2017-05-16),

13. 9608349 - Contact having two contact portions with their central lines in one plane (2017-03-28),

14. 9601853 - Printed wiring board and connector connecting the wiring board (2017-03-21),

15. 9559449 - Printed wiring board and connector connecting the wiring board (2017-01-31),

Company Overview

Ddk Ltd., headquartered in Tokyo, Japan, specializes in the development and manufacturing of advanced electrical connectors. The company focuses on a range of technologies including printed wiring boards, card connectors, and flexible circuit boards. Ddk Ltd. is recognized for its expertise in miniaturized and floating connectors, emphasizing innovative connector design to meet the evolving demands of various industries. Their commitment to quality and technological advancement positions them as a key player in the electrical connector market.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 20 2026

140 Patents

#444 in Tokyo

#899 in Japan

#5,792 in the World

Ddk Ltd.

Forward Citations = 1,147

93 inventors:

Masayuki A Suzuki (34 out of 157 patents)

Hirokazu Takahashi (29 out of 122 patents)

Hitoshi Kikuchi (16 out of 38 patents)

4. Kazunori Takei (15 out of 21 patents)

5. Kazuyuki Ozai (15 out of 17 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Ddk Ltd.. Retrieved from https://idiyas.com/company/ddk

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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