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Petoca, Ltd.

USPTO Granted Patents = 42

Forward Citations = 445

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46 inventors (with patents filed for the assignee):

Yoshiyuki Nishimura (11 out of 11 patents)

Hideyuki Nakajima (10 out of 10 patents)

Toshio Tamaki (8 out of 8 patents)

4. Hiroshi Ejiri (5 out of 5 patents)

5. Minoru Takabatake (5 out of 5 patents)

6. Yoshikazu Nagata (5 out of 5 patents)

7. Takashi Maeda (4 out of 4 patents)

8. Yoshinori Suto (4 out of 4 patents)

9. Toshiyuki Ito (4 out of 4 patents)

10. Akio Takamatsu (4 out of 4 patents)

11. Toshifumi Kawamura (4 out of 4 patents)

12. Yasushi Katsuta (4 out of 4 patents)

13. Katsumi Takano (4 out of 4 patents)

14. Tomiji Hosotsubo (4 out of 4 patents)

15. Toshio Yonezawa (3 out of 11 patents)

Core Competencies:

Carbon Fiber

Lithium Secondary Battery

Activated Carbon

Graphite Materials

Composite Reinforcement

Pitch-Based Fibers

Electrode Materials

Non-Woven Fabrics

High Strength Composites

Milled Graphite

Flexible Materials

Porous Composites

42 patents: Sort by Forward Citations

1. 6303095 - Milled carbon fiber and process for producing the same (2001-10-16),

2. 6287729 - Graphite materials for negative electrode used in lithium secondary battery (2001-09-11),

3. 6118650 - Mesophase pitch-based activated carbon fibers and electric double layer (2000-09-12),

4. 6077463 - Process for producing graphite material for negative electrode used in (2000-06-20),

5. 6022518 - Surface graphitized carbon material and process for producing the same (2000-02-08),

6. 5951959 - Mesophase pitch-based carbon fiber for use in negative electrode of (1999-09-14),

7. 5888928 - Process for producing activated carbon fiber molding and activated (1999-03-30),

8. 5855663 - Carbon fibers for reinforcement of cement and cement composite material (1999-01-05),

9. 5824245 - Processes for preparing milled graphite fibers (1998-10-20),

10. 5795843 - Pitch-based activated carbon fiber (1998-08-18),

11. 5795678 - Negative electrode for use in lithium secondary battery and process for (1998-08-18),

12. 5792577 - Negative electrode material for use in lithium-ion secondary battery and (1998-08-11),

13. 5698341 - Carbon material for lithium secondary battery and process for producing (1997-12-16),

14. 5686181 - Carbon fibers for reinforcement of cement and cement composite material (1997-11-11),

15. 5652058 - Carbon fiber rovings for reinforcement of concrete (1997-07-29),

Company Overview

Petoca, Ltd., based in Tokyo, specializes in advanced materials and technologies, focusing on carbon fiber and its various applications. The company is engaged in the development and manufacturing of lithium secondary batteries, activated carbon fibers, and graphite materials. Additionally, Petoca explores innovative solutions in cement composite materials and electromagnetic wave reflection, contributing to diverse industries. Their expertise in pitch-based carbon fibers and carbon fiber reinforcement positions them as a key player in the materials science sector.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 13 2026

42 Patents

#889 in Tokyo

#1,911 in Japan

#16,354 in the World

Petoca, Ltd.

Forward Citations = 445

46 inventors:

Yoshiyuki Nishimura (11 out of 11 patents)

Hideyuki Nakajima (10 out of 10 patents)

Toshio Tamaki (8 out of 8 patents)

4. Hiroshi Ejiri (5 out of 5 patents)

5. Minoru Takabatake (5 out of 5 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Petoca, Ltd.. Retrieved from https://idiyas.com/company/petoca

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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