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Valqua, Ltd.

USPTO Granted Patents = 68

EPO Patents = 7

Trademarks = 19

Forward Citations = 428

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46 inventors (with patents filed for the assignee):

Nobuhiro Yoshida (21 out of 26 patents)

Ippei Nakagawa (15 out of 22 patents)

Kazuaki Tsuji (9 out of 27 patents)

4. Sangho Kim (9 out of 9 patents)

5. Akira Ueda (8 out of 10 patents)

6. Yong-Gu Kang (6 out of 6 patents)

7. Naoki Osumi (5 out of 6 patents)

8. Takafumi Sakurai (5 out of 5 patents)

9. Mitsuru Minami (4 out of 4 patents)

10. Akihiro Nagano (4 out of 4 patents)

11. Tetsuya Komeda (4 out of 4 patents)

12. Takahiro Yamamoto (4 out of 5 patents)

13. Kana Hirai (3 out of 3 patents)

14. Michi Kuroda (3 out of 4 patents)

15. Sayaka Yoshida (3 out of 3 patents)

Core Competencies:

Metal Gasket

Seal Material

Elastomer Composition

Perfluoroelastomer Composition

Composite Seal

Liquid Leakage Prediction

Semiconductor Production

Piezoelectric Stack

Rubber Composition

Conductive Layer

Sealing Ring

Vacuum Gate Valve

68 patents: Sort by Forward Citations

1. D1107594 - Tank transport container rotating jig (2025-12-30),

2. 12385565 - Metal gasket (2025-08-12),

3. 12339188 - Information processing device (2025-06-24),

4. D1074944 - Seal (2025-05-13),

5. 12264236 - Rubber composition for sealing material and sealing material using the same (2025-04-01),

6. 12180315 - Elastomer composition and sealing material (2024-12-31),

7. 12148141 - Determination system (2024-11-19),

8. 12072349 - Method of manufacturing low heat-resistant sensor (2024-08-27),

9. D1031951 - Composite seal (2024-06-18),

10. 12013036 - Composite seal material (2024-06-18),

11. 11835539 - Low heat-resistant sensor (2023-12-05),

12. 11825601 - Substrate with conductive layer (2023-11-21),

13. 11802621 - Metal gasket (2023-10-31),

14. D993794 - Operation device for liquid leakage prediction system (2023-08-01),

15. D983941 - Sealing ring (2023-04-18),

VALQUA, LTD. is a global leader in manufacturing and distributing sealing products and solutions. With over 75 years of experience, VALQUA is committed to providing high-quality and reliable sealing solutions for a wide range of industries including automotive, chemical, oil and gas, and food processing. We offer a comprehensive range of gaskets, packings, o-rings, and mechanical seals designed to meet the most demanding requirements of our customers. Our cutting-edge technology, advanced manufacturing processes, and exceptional customer service have made us a trusted partner for companies worldwide. Visit our website to learn more about our innovative sealing solutions and how we can support your business.

This text is generated by artificial intelligence and may not be accurate.

Company Badge

USPTO Data Jan 1 1976 - Jan 6 2026

68 Patents

#593 in Tokyo

#1,400 in Japan

#10,601 in the World

Valqua, Ltd.

Forward Citations = 428

46 inventors:

Nobuhiro Yoshida (21 out of 26 patents)

Ippei Nakagawa (15 out of 22 patents)

Kazuaki Tsuji (9 out of 27 patents)

4. Sangho Kim (9 out of 9 patents)

5. Akira Ueda (8 out of 10 patents)

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