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For the Inventor, By the Inventor

Saitama, Japan

Yoshiharu Doi

This inventor holds 15 USPTO granted patents and 2 EPO patents. Top assignees: Riken Corporation, The Institute of Physical and Chemical Research, Japan Science and Technology Agency. Active years: 1999-2016.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Yoshiharu Doi. Retrieved from https://idiyas.com/inventor/yoshiharu-doi-r5qa5mis

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

USPTO Granted Patents = 15

% Patents Active = 46.7


Average Co-Inventor Count = 2.8

ph-index = 4

Forward Citations = 53(Granted Patents)


Location History:

  • Wako, JP (1999 - 2013)
  • Saitama, JP (1999 - 2016)

Company Filing History:

goldMedal9 out of 890 
 
Riken Corporation
 patents
silverMedal3 out of 94 
 
The Institute of Physical and Chemical Research
 patents
bronzeMedal2 out of 1,328 
 
Japan Science and Technology Agency
 patents
4. 1 out of 4 
 
Akebono Research and Development Center Ltd.
 patents
5. 1 out of 373 
 
Japan Science and Technology Corporation
 patents
6. 1 out of 1 
 
Japan Science and Technology Corporation, and Riken
 patent
7. 2 out of 834,513 
Other
 patents
where one patent can have more than one assignee

Years Active: 1999-2016

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15 patents (USPTO):Explore Patents
1. 9447441 - Method for producing polyhydroxyalkanoate having long main chain structure (2016-09-20),
2. 8450448 - Thermostable biopolyester (2013-05-28),
3. 7938999 - High-strength fiber of biodegradable aliphatic polyester and process for producing the same (2011-05-10),
4. 7662325 - Polyhydroxyalkanoic acid fibers with high strength, fibers with high strength and high modulus of elasticity, and processes for producing the same (2010-02-16),
5. 7456002 - Mutant poly(3-hydroxyalkanoic acid) synthases (2008-11-25),
6. 7276361 - Method for producing biodegradable polyester (2007-10-02),
7. 7241495 - Polyhydroxyalkanoic acid fibers with high strength, fibers with high strength and high modulus of elasticity, and processes for producing the same (2007-07-10),
8. 7148299 - Polymerization catalyst (2006-12-12),
9. 6872564 - Method of producing copolymer polyester (2005-03-29),
10. 6620601 - Methods for transformation of plants, transformed plants and processes for preparation of polyesters (2003-09-16),
11. 6514743 - Polyester synthase and a gene coding for the same (2003-02-04),
12. 6391611 - Polyester synthase and a gene coding for the same (2002-05-21),
13. 5981257 - Polyester synthase gene and process for producing polyester (1999-11-09),
14. 5968805 - Polyester synthase and a gene coding for the same (1999-10-19),
15. 5917002 - Poly(3-hydroxybutanoic acid) film (1999-06-29),

Title: Innovations of Yoshiharu Doi

Introduction

Yoshiharu Doi is a prominent inventor based in Saitama, Japan. He has made significant contributions to the field of bioplastics and biomaterials. With a total of 15 patents to his name, Doi's work focuses on sustainable materials that can benefit various industries.

Latest Patents

One of his latest patents is a method for producing polyhydroxyalkanoate (PHA) with a long main chain structure. This PHA copolymer consists of 3HB (3-hydroxybutyrate), 3HP (3-hydroxypropionate), and 5HV (5-hydroxyvalerate). The resulting polyhydroxyalkanoate can be utilized for bioplastic or biomaterial applications. The method involves culturing a microorganism belonging to a specific genus in a culture medium that includes lactone and/or hydroxy acid or its salt as a carbon source. Another notable patent is for a thermostable biopolyester, which is a poly(3-hydroxyalkanoate) or its copolymer with reduced calcium content. This innovation enhances thermal stability due to the decreased calcium levels.

Career Highlights

Yoshiharu Doi has worked with reputable organizations such as Riken Corporation and the Institute of Physical and Chemical Research. His career has been marked by a commitment to advancing the field of bioplastics and developing environmentally friendly materials.

Collaborations

Doi has collaborated with notable colleagues, including Tadahisa Iwata and Toshiaki Fukui. Their joint efforts have contributed to the advancement of research in biopolymer technology.

Conclusion

Yoshiharu Doi's innovative work in the field of bioplastics and biomaterials showcases his dedication to sustainability and environmental responsibility. His patents reflect a significant impact on the development of new materials that can benefit 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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