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For the Inventor, By the Inventor

Yao, Japan

Keiki Chichiishi

This inventor holds 6 USPTO granted patents. Top assignee: Yamamoto Chemicals, Inc.. Active years: 2002-2010.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Keiki Chichiishi. Retrieved from https://idiyas.com/inventor/keiki-chichiishi

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 = 16.7

Average Co-Inventor Count = 3.8

ph-index = 2

Forward Citations = 11(Granted Patents)


Location History:

  • Kyoto, JP (2002 - 2006)
  • Yao, JP (2008 - 2010)

Company Filing History:

goldMedal6 out of 73 
 
Yamamoto Chemicals, Inc.
 patents

Years Active: 2002-2010

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6 patents (USPTO):Explore Patents
1. 7709660 - Polymethine ether compounds (2010-05-04),
2. 7485404 - Nonsolvate-form crystal of polymethine compound and process for producing the same (2009-02-03),
3. 7446212 - Polymethine ethers (2008-11-04),
4. RE39105 - Polymethine compounds, method of producing same, and use thereof (2006-05-22),
5. 6716993 - Polymethine compound and near-infrared absorbing material comprising same (2004-04-06),
6. 6342335 - Polymethine compounds, method of producing same, and use thereof (2002-01-29),

Title: Keiki Chichiishi: Innovator in Polymethine Compounds

Introduction

Keiki Chichiishi is a prominent inventor based in Yao, Japan. He has made significant contributions to the field of chemistry, particularly in the development of polymethine compounds. With a total of six patents to his name, Chichiishi's work has garnered attention for its innovative approaches and practical applications.

Latest Patents

Chichiishi's latest patents include the invention of polymethine ether compounds. This invention provides novel compounds that serve as intermediates for producing polymethine compounds with high purity and yields. The compounds are characterized by a general formula that includes various substituents, allowing for versatility in their application. Another notable patent is for a nonsolvate-form crystal of a polymethine compound. This crystal exhibits excellent stability in solution, a high gram extinction coefficient, and is particularly sensitive to general-purpose semiconductor lasers. The production process for this crystal involves reacting a polymethine ether compound with hydrochloric or hydrobromic acid.

Career Highlights

Chichiishi is currently associated with Yamamoto Chemicals, Inc., where he continues to advance his research and development efforts. His work has not only contributed to the scientific community but has also provided practical solutions for various industrial applications.

Collaborations

Chichiishi has collaborated with notable coworkers, including Shigeo Fujita and Nobuaki Sasaki. These collaborations have further enriched his research and have led to the successful development of innovative chemical compounds.

Conclusion

Keiki Chichiishi's contributions to the field of polymethine compounds highlight his role as a leading inventor in the industry. His innovative patents and collaborations reflect his commitment to advancing chemical research and development.

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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