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For the Inventor, By the Inventor

Tokyo, Japan

Koa Oil Company, Limited

Calculating rank
USPTO Granted Patents = 26


Forward Citations = 250

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42 inventors (with patents filed for the assignee):

goldMedal Kosaku Noguchi (12 out of 12 patents)

silverMedal Honami Tanaka (8 out of 8 patents)

bronzeMedal Eiji Kitajima (7 out of 8 patents)

4.  Yukimasa Kumura (5 out of 5 patents)

5.  Masaki Fujii (4 out of 6 patents)

6.  Okiyoshi Okamura (4 out of 4 patents)

7.  Kiyoharu Yoshimura (4 out of 4 patents)

8.  Masanori Minohata (3 out of 5 patents)

9.  Yoshihito Tamanoi (3 out of 3 patents)

10.  Hirokazu Teraoka (3 out of 4 patents)

11.  Masao Hayashi (3 out of 3 patents)

12.  Tomonori Sunada (3 out of 3 patents)

13.  Susumu Shimizu (2 out of 27 patents)

14.  Haruki Yamasaki (2 out of 8 patents)

15.  Takashi Oyama (2 out of 3 patents)


Core Competencies:
Olefin Oligomerization
Carbon Fiber
Coke Calcining
Elastic Graphite
Mesocarbon Microbeads
Crystallizable Carbonaceous
Oil Adsorbent
Coking Process
Thermal Cracking
Corrosion Measurement
Pitch Production

26 patents:

1. 5883036 - Olefin oligomerization catalyst, process for preparing the same, and (1999-03-16),
2. 5798459 - Subject identification method, apparatus and system (1998-08-25),
3. 5476730 - Air cell (1995-12-19),
4. 5462816 - Air cell (1995-10-31),
5. 5240785 - Air cell (1993-08-31),
6. 5204030 - Method for producing pitch-type carbon fiber (1993-04-20),
7. 5190696 - Process for preparation of carbonaceous molded body having excellent (1993-03-02),
8. 5183603 - Process for producing a coil-shaped carbon fiber bundle (1993-02-02),
9. 5137667 - Process for producing elastic graphite molded products (1992-08-11),
10. 5057297 - Method for producing elastic graphite structures (1991-10-15),
11. 5017358 - Preparation of elastic graphite materials (1991-05-21),
12. 4828682 - Coking process (1989-05-09),
13. 4769139 - Apparatus for production of crystallizable carbonaceous material (1988-09-06),
14. 4640822 - Apparatus for producing bulk mesophase (1987-02-03),
15. 4488957 - Method and apparatus for production of crystallizable carbonaceous (1984-12-18),
Company Overview
Koa Oil Company, Limited is a prominent player in the oil and petrochemical industry, headquartered in Tokyo, Japan. The company specializes in the development and production of a wide range of high-quality lubricants, industrial oils, and specialty chemicals. Koa Oil is committed to innovation, focusing on advanced research in refining technologies and sustainable practices to meet the evolving needs of various sectors, including automotive, manufacturing, and energy. Its strategic position in Japan allows it to serve both domestic and international markets effectively.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Nov 3 2026

26 Patents

#1,164 in Tokyo

#2,507 in Japan

#24,830 in the World

Tokyo, JP
Tokyo, Japan

Koa Oil Company, Limited

Forward Citations = 250

42 inventors:

goldMedal Kosaku Noguchi (12 out of 12 patents)

silverMedal Honami Tanaka (8 out of 8 patents)

bronzeMedal Eiji Kitajima (7 out of 8 patents)

4.  Yukimasa Kumura (5 out of 5 patents)

5.  Masaki Fujii (4 out of 6 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Koa Oil Company, Limited. Retrieved from https://idiyas.com/company/koa-oil-company

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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