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Tpr Co., Ltd.

USPTO Granted Patents = 61

EPO Patents = 45

Forward Citations = 77

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93 inventors (with patents filed for the assignee):

Koichi Hatakeyama (7 out of 7 patents)

Akira Hikone (7 out of 7 patents)

Akira Sato (7 out of 13 patents)

4. Kiyoyuki Kawai (6 out of 38 patents)

5. Atsushi Nakazawa (5 out of 8 patents)

6. Noriaki Ayuzawa (5 out of 5 patents)

7. Masahide Hama (5 out of 5 patents)

8. Yutaka Kitazume (4 out of 4 patents)

9. Seiji Tamaki (4 out of 4 patents)

10. Tomoyuki Sato (4 out of 9 patents)

11. Shohtaroh Hara (4 out of 4 patents)

12. Hidemi Kato (3 out of 11 patents)

13. Takatsugu Iwashita (3 out of 3 patents)

14. Takashi Sato (3 out of 12 patents)

15. Takashi Oizumi (3 out of 3 patents)

Core Competencies:

Casting System

Piston Unit

Centrifugal Casting Mold

Thermoelectric Conversion Module

Sintered Alloy Valve Guide

Multi-Walled Carbon Nanotube

Electric Double Layer Capacitor

Porous Carbon Material

Cylinder Liner

Piston Ring Combination

Seal Ring

Compression Ring

61 patents: Sort by Forward Citations

1. 12485476 - Casting system (2025-12-02),

2. 12397343 - Mold cooling device, cast manufacturing system, and cast manufacturing method (2025-08-26),

3. 12392301 - Piston unit, top land member, and combination of piston unit parts (2025-08-19),

4. 12305590 - Spiny liner and manufacturing method of same, and method of determining bonding strength (2025-05-20),

5. 12292118 - Piston ring (2025-05-06),

6. 12281380 - CRN coating film and sliding member (2025-04-21),

7. 12196325 - Compression ring (2025-01-14),

8. 12173799 - Oil control ring (2024-12-24),

9. 12121958 - Centrifugal casting mold and centrifugal casting mold assembly device (2024-10-22),

10. 12117084 - Combination of piston rings, and combination structure of piston and piston rings (2024-10-15),

11. 12116951 - Cylinder liner and cylinder bore (2024-10-15),

12. 12092222 - Piston ring combination, and internal combustion engine (2024-09-17),

13. 12066111 - Piston ring (2024-08-20),

14. 12058937 - Thermoelectric conversion module and structure for thermoelectric conversion element (2024-08-06),

15. 12049689 - Iron-based sintered alloy valve seat (2024-07-30),

TPR CO., LTD. is a leading manufacturer and supplier of innovative industrial products. With a strong commitment to quality, TPR offers a wide range of high-performance solutions for various industries. From precision engineering to advanced materials, our products are designed to meet the diverse needs of customers. Visit our website to explore our extensive product portfolio and learn more about our company.

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

Company Badge

USPTO Data Jan 1 1976 - Dec 30 2025

61 Patents

#621 in Tokyo

#1,476 in Japan

#11,504 in the World

Tpr Co., Ltd.

Forward Citations = 77

93 inventors:

Koichi Hatakeyama (7 out of 7 patents)

Akira Hikone (7 out of 7 patents)

Akira Sato (7 out of 13 patents)

4. Kiyoyuki Kawai (6 out of 38 patents)

5. Atsushi Nakazawa (5 out of 8 patents)

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