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For the Inventor, By the Inventor

Niihama, Japan

Tamio Shirafuji

This inventor holds 11 USPTO granted patents. Top assignee: Sumitomo Chemical Company, Limited. Active years: 1987-1994.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Tamio Shirafuji. Retrieved from https://idiyas.com/inventor/tamio-shirafuji

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

USPTO Granted Patents = 11

% Patents Active = 100.0

Average Co-Inventor Count = 2.8

ph-index = 3

Forward Citations = 20(Granted Patents)


Location History:

  • Niihama, JP (1987 - 1989)
  • Ehime, JP (1993 - 1994)

Company Filing History:

goldMedal11 out of 6,961 
 
Sumitomo Chemical Company, Limited
 patents

Years Active: 1987-1994

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11 patents (USPTO):Explore Patents
1. 5300662 - Process for producing coumarin and derivatives thereof (1994-04-05),
2. 5260457 - Process for producing coumarin and derivative thereof (1993-11-09),
3. 5237075 - Process for producing 3,4-dihydrocoumarin derivatives (1993-08-17),
4. 5231194 - Process for producing coumarin derivatives (1993-07-27),
5. 5218129 - Process for producing 3,4-dihydrocoumarin (1993-06-08),
6. 4879422 - Method for producing cycloalkanol (1989-11-07),
7. 4849551 - Method for separating cyclohexanol (1989-07-18),
8. 4849550 - Method for producing cycloalkanols (1989-07-18),
9. 4716253 - Method for producing cycloalkanols (1987-12-29),
10. 4691064 - Method for producing cycloalkanols (1987-09-01),
11. 4670612 - Method for producing alicyclic alcohols (1987-06-02),

Title: Tamio Shirafuji: Innovator in Coumarin Production

Introduction

Tamio Shirafuji is a notable inventor based in Niihama, Japan. He has made significant contributions to the field of chemistry, particularly in the production of coumarin and its derivatives. With a total of 11 patents to his name, Shirafuji's work has had a considerable impact on the industry.

Latest Patents

Shirafuji's latest patents include innovative processes for producing coumarin and its derivatives. One of his notable inventions is a process that involves the dehydrogenation of 3,4-dihydrocoumarin or its derivatives in the presence of a palladium catalyst, achieved by heating under reduced pressure. Another significant patent details a method for producing coumarin represented by a specific formula, which involves heating a 3-(2-cyclohexanoyl) propionic acid ester in the presence of a palladium catalyst, allowing for cyclization and dehydrogenation reactions.

Career Highlights

Tamio Shirafuji is currently associated with Sumitomo Chemical Company, Limited, where he continues to innovate and develop new chemical processes. His expertise in the field has led to advancements that benefit both the company and the broader chemical industry.

Collaborations

Shirafuji has worked alongside talented colleagues such as Kiyomi Sakai and Itaru Kawata. Their collaborative efforts have contributed to the success of various projects and patents.

Conclusion

Tamio Shirafuji's contributions to the field of chemistry, particularly in the production of coumarin, highlight his innovative spirit and dedication to advancing chemical processes. His work continues to influence the industry and inspire future innovations.

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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