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For the Inventor, By the Inventor

Tokyo, Japan

Maruzen Petrochemical Company, Limited


USPTO Granted Patents = 122


Trademarks = 3

Forward Citations = 557

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178 inventors (with patents filed for the assignee):

goldMedal Takanori Yamagishi (17 out of 18 patents)

silverMedal Masatoshi Tsuchitani (14 out of 14 patents)

bronzeMedal Toshifumi Takemori (11 out of 11 patents)

4.  Shinji Sugihara (9 out of 12 patents)

5.  Tomo Oikawa (9 out of 10 patents)

6.  Ryoichi Nakajima (9 out of 12 patents)

7.  Takahito Mita (8 out of 8 patents)

8.  Takashi Naniki (7 out of 7 patents)

9.  Shigeharu Yamamoto (7 out of 7 patents)

10.  Sakae Naito (7 out of 7 patents)

11.  Kazuhiko Haba (6 out of 7 patents)

12.  Norihiro Yoshida (6 out of 6 patents)

13.  Minoru Iijima (6 out of 6 patents)

14.  Hiromitsu Baba (6 out of 6 patents)

15.  Tadashi Matsumoto (6 out of 28 patents)


Core Competencies:
Core-Shell Polymer Microparticles
Hydrogenated Petroleum Resin
Vinyl Ether Polymer
Bifunctional Acrylate Compound
Cyclic Carbonate Synthesis
Optical Element Material
Semiconductor Lithography
Photoresist Copolymer
Thermal Imprint Resin
Protein Adsorption Preventing Agent
Star-Shaped Vinyl Ether Polymer
Metal Nanoparticle Composite

122 patents:

1. 12466944 - Core/shell type polymer microparticles, dispersion of particles, and method for producing said microparticles (2025-11-11),
2. 12319766 - Core-shell-type polymer fine particles having phosphonic acid or phosphonic acid ester structure, particle dispersion, molded article, and method for producing said fine particles (2025-06-03),
3. 12280364 - Complex compound and method for manufacturing the same (2025-04-21),
4. 12180322 - Protein adsorption preventing agent, protein adsorption preventing film, and medical tool using same (2024-12-31),
5. 11971660 - Cross-linked polymer for resist (2024-04-30),
6. 11919850 - Bifunctional (meth)acrylate compound and polymer (2024-03-05),
7. 11891461 - Method for producing vinyl ether polymer containing hydrocarbon group by radical polymerization (2024-02-06),
8. 11827729 - Method for producing polyvinylphosphonic acid copolymer (2023-11-28),
9. 11814351 - Bifunctional (meth)acrylate compound and polymer (2023-11-14),
10. 11773200 - Method for producing hydrogenated petroleum resin (2023-10-03),
11. 11725078 - Method for producing acid-decomposable polymer (2023-08-15),
12. 11485803 - Method for deodorizing hydrogenated petroleum resin, and method for producing hydrogenated petroleum resin (2022-11-01),
13. 11377507 - Method for producing vinyl ether polymer containing oxyethylene chain by radical polymerization (2022-07-05),
14. 11247961 - Me 1 hod for removing or collecting 2-alkoxyethanol, and method for producing (2-alkoxyethyl) vinyl ether (2022-02-15),
15. 11220563 - Production method for hydrogenated petroleum resin (2022-01-11),
Maruzen Petrochemical Company is a leading global chemical manufacturing company. With expertise in the production of petrochemicals, including olefins, plastics, and synthetic fibers, we provide high-quality products and solutions to a wide range of industries. Our commitment to innovation, sustainability, and customer satisfaction has made us a trusted partner for clients worldwide. For more information, please visit our website.
This text is generated by artificial intelligence and may not be accurate.

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USPTO Data Jan 1 1976 - Jan 6 2026

122 Patents

#432 in Tokyo

#977 in Japan

#6,371 in the World

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Tokyo, Japan

Maruzen Petrochemical Company, Limited

Forward Citations = 557

178 inventors:

goldMedal Takanori Yamagishi (17 out of 18 patents)

silverMedal Masatoshi Tsuchitani (14 out of 14 patents)

bronzeMedal Toshifumi Takemori (11 out of 11 patents)

4.  Shinji Sugihara (9 out of 12 patents)

5.  Tomo Oikawa (9 out of 10 patents)

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