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Nippon Petroleum Refining Company, Limited

USPTO Granted Patents = 20

EPO Patents = 4

Trademarks = 2

Forward Citations = 85

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57 inventors (with patents filed for the assignee):

Takashi Oyama (7 out of 20 patents)

Tamotsu Tano (6 out of 17 patents)

Kazuhisa Nakanishi (5 out of 8 patents)

4. Keiji Higashi (5 out of 5 patents)

5. Hideki Ono (4 out of 63 patents)

6. Ippei Fujinaga (4 out of 10 patents)

7. Hiromitsu Hashisaka (4 out of 6 patents)

8. Masaki Fujii (4 out of 11 patents)

9. Kiwamu Takeshita (4 out of 8 patents)

10. Akio Sakamoto (3 out of 8 patents)

11. Keizou Ikai (3 out of 5 patents)

12. Toshitaka Fujii (3 out of 4 patents)

13. Takashi Noro (3 out of 3 patents)

14. Akihiko Niizawa (3 out of 3 patents)

15. Masahiro Yamaguchi (3 out of 24 patents)

20 patents: Sort by Forward Citations

1. 8226921 - Raw coke for electricity storage carbon material and needle coke (2012-07-24),

2. 8197788 - Raw coke for electricity storage carbon material and needle coke (2012-06-12),

3. 8137530 - Process for producing petroleum coke (2012-03-20),

4. 7964173 - Feedstock composition and raw coke for electricity storage carbon material and needle coke (2011-06-21),

5. 7959888 - Raw coke for electricity storage carbon material and needle coke (2011-06-14),

6. 7666306 - Adsorbent, method for producing same, and method for processing oil-containing waste water (2010-02-23),

7. 7112311 - Cooling method of hydrotreating plant and cooling unit therefor (2006-09-26),

8. 6882517 - Raw material composite for carbon material used in electric double layer capacitor, manufacturing method of the same, electric double layer capacitor, and manufacturing method of the same (2005-04-19),

9. 5647971 - Method and apparatus for changing solvent composition in a solvent (1997-07-15),

10. 5611894 - Method and apparatus for changing solvent composition in a solvent (1997-03-18),

11. 5543041 - Supply system of petroleum heavy oil containing magnetic fine particles (1996-08-06),

12. 5381227 - Standard materials and methods for instrumental measurement for ASTM (1995-01-10),

13. 5376257 - Process for feed oil refining for production of lubricating oil (1994-12-27),

14. 5316658 - Process for the production of low-sulfur diesel gas oil (1994-05-31),

15. 5139330 - Standard samples and methods of instrumental measurement of ASTM color (1992-08-18),

Nippon Petroleum Refining Company, Limited is a leading Japanese petroleum company engaged in the refining and distribution of oil products. With a focus on innovation and sustainability, the company serves a diverse range of industries and customers in Japan and around the world.

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

Company Badge

USPTO Data Jan 1 1976 - Dec 2 2025

20 Patents

#1,170 in Tokyo

#2,882 in Japan

#30,309 in the World

Nippon Petroleum Refining Company, Limited

Forward Citations = 85

57 inventors:

Takashi Oyama (7 out of 20 patents)

Tamotsu Tano (6 out of 17 patents)

Kazuhisa Nakanishi (5 out of 8 patents)

4. Keiji Higashi (5 out of 5 patents)

5. Hideki Ono (4 out of 63 patents)

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