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For the Inventor, By the Inventor

Ichihara, Japan

Ichiro Ichikawa

This inventor holds 6 USPTO granted patents. Top assignee: Sumitomo Chemical Company, Limited. Active years: 1977-1988.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Ichiro Ichikawa. Retrieved from https://idiyas.com/inventor/ichiro-ichikawa

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

USPTO Granted Patents = 6

% Patents Active = 100.0

Average Co-Inventor Count = 3.0

ph-index = 5

Forward Citations = 145(Granted Patents)


Location History:

  • Ichihara, JA (1977 - 1978)
  • Ichihara, JP (1978 - 1980)
  • Chiba, JP (1987 - 1988)

Company Filing History:

goldMedal6 out of 6,960 
 
Sumitomo Chemical Company, Limited
 patents

Years Active: 1977-1988

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6 patents (USPTO):Explore Patents
1. 4741989 - Positive photoresist aqueous developer solution containing quaternary (1988-05-03),
2. 4673554 - Method of purifying tantalum (1987-06-16),
3. 4220738 - Process for producing block copolymer from conjugated diene and vinyl (1980-09-02),
4. 4122134 - Method for producing transparent block copolymer resin (1978-10-24),
5. 4089913 - Process for producing transparent block copolymer resin (1978-05-16),
6. 4054616 - Process for producing transparent block copolymer resins (1977-10-18),

Title: Ichiro Ichikawa: Innovator in Photoresist Development

Introduction

Ichiro Ichikawa is a prominent inventor based in Ichihara, Japan. He has made significant contributions to the field of photoresist technology, holding a total of 6 patents. His work focuses on improving the sensitivity and resolution of photoresists, which are crucial in various applications, including semiconductor manufacturing.

Latest Patents

Ichikawa's latest patents include a positive photoresist aqueous developer solution containing quaternary ammonium hydroxide. This developer enhances the performance of positive photoresists, making them more sensitive and capable of achieving higher resolution. Additionally, he has developed a method for purifying tantalum, which involves obtaining high-purity tantalum pentoxide through a series of specific steps.

Career Highlights

Ichiro Ichikawa is associated with Sumitomo Chemical Company, Limited, where he has been instrumental in advancing photoresist technologies. His innovative approaches have positioned him as a key figure in the industry, contributing to the development of materials that are essential for modern electronics.

Collaborations

Ichikawa has collaborated with notable colleagues, including Tamotsu Miki and Shizuo Narisawa. These partnerships have fostered a collaborative environment that encourages innovation and the sharing of ideas.

Conclusion

Ichiro Ichikawa's contributions to the field of photoresist technology and his innovative patents highlight his role as a leading inventor. His work continues to influence advancements in semiconductor manufacturing and materials science.

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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