Ichihara, Japan

Hirofumi Johoji

This inventor holds 15 USPTO granted patents, plus 1 CIPO patent. Top assignees: Sumitomo Chemical Company, Limited, Tokyo Institute of Technology. Active years: 1993-2013.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Hirofumi Johoji. Retrieved from https://idiyas.com/inventor/hirofumi-johoji

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile


% Patents Active = 66.7


Average Co-Inventor Count = 3.5

ph-index = 6

Forward Citations = 93(Granted Patents)


Location History:

  • Chiba, JP (2000 - 2001)
  • Ichihara, JP (1993 - 2013)

Company Filing History:


Years Active: 1993-2013

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15 patents (USPTO):Explore Patents

Title: Hirofumi Johoji: Innovator in Polymer Technology

Introduction: Hirofumi Johoji is a notable inventor based in Ichihara, Japan, with a remarkable portfolio of 15 patents to his name. His work primarily focuses on polymers and copolymers, contributing significantly to advancements in material science.

Latest Patents: Among his latest patents, two are particularly noteworthy. The first patent, titled "Polymer and method for producing same," describes a new polymer that includes various repeating unit configurations. Each unit allows for a wide range of substituents including hydrogen atoms, halogens, and several organic groups, expanding the potential applications of these polymers. The second patent, "Copolymer and method for producing same," outlines a copolymer structure that merges specific monomer units with olefin units, harnessing similar versatility in its composition.

Career Highlights: Hirofumi Johoji's career is marked by significant contributions to major organizations. He has held positions at the Sumitomo Chemical Company, Limited, and the Tokyo Institute of Technology. His research and innovative methodologies have enhanced the development of new materials in the chemical industry.

Collaborations: Throughout his career, Hirofumi has collaborated with esteemed professionals, including Hidetake Hozumi and Tadaaki Nishiyama. These partnerships have led to the successful development of several patents, showcasing the benefits of teamwork in scientific innovation.

Conclusion: Hirofumi Johoji's contributions to the field of polymer technology remain impactful, and his extensive patent portfolio reflects his dedication to innovation. As he continues to explore and develop new materials, his work promises to influence future advancements in various industries.

Profile summary based on public USPTO records.
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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