Takuji Hirahara

This inventor holds 7 USPTO granted patents. Top assignees: Mitsubishi Kasei Corporation, Mitsubishi Chemical Industries Limited. Active years: 1989-1994.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Takuji Hirahara. Retrieved from https://idiyas.com/inventor/takuji-hirahara

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

Calculating rank

USPTO Granted Patents = 7

% Patents Active = 100.0

Average Co-Inventor Count = 3.6

ph-index = 6

Forward Citations = 53(Granted Patents)

Location History:

Yokohama, JP (1989)
Kawasaki, JP (1990 - 1994)

Company Filing History:

6 out of 499

Mitsubishi Kasei Corporation

patents

1 out of 614

Mitsubishi Chemical Industries Limited

patents

Years Active: 1989-1994

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7 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 5302686 - Hollow container and stretched film made of a copolyester (1994-04-12),

2. 5262513 - Copolyester, and hollow container and stretched film made thereof (1993-11-16),

3. 5239045 - Copolyester and hollow container and oriented film comprising the (1993-08-24),

4. 5030705 - Copolymerized polyester from phenylene di(oxyaceteic acid) and (1991-07-09),

5. 4965302 - Thermoplastic polyester resin composition and molded articles produced (1990-10-23),

6. 4959421 - Copolymerized polyester having excellent transparency and gas barrier (1990-09-25),

7. 4814366 - Thermoplastic polyester resin composition (1989-03-21),

Title: Takuji Hirahara: Innovator in Copolyester Technology

Introduction

Takuji Hirahara is a notable inventor based in Kawasaki, Japan. He has made significant contributions to the field of materials science, particularly in the development of copolyester products. With a total of 7 patents to his name, Hirahara's work has had a lasting impact on various industries.

Latest Patents

Hirahara's latest patents include innovative designs for hollow containers and stretched films made of copolyester. One of his notable inventions is a hollow article or sheet of copolyester characterized by specific components. This includes terephthalic acid as a dicarboxylic acid component and ethylene glycol as a diol component. The invention is further defined by the inclusion of isophthalic acid, diethylene glycol, intrinsic viscosity, terminal carboxyl group concentration, and cyclic trimer content. Another significant patent focuses on a copolyester that also utilizes terephthalic acid and ethylene glycol, showcasing his expertise in this area.

Career Highlights

Throughout his career, Takuji Hirahara has worked with prominent companies such as Mitsubishi Kasei Corporation and Mitsubishi Chemical Industries Limited. His experience in these organizations has allowed him to refine his skills and contribute to groundbreaking advancements in copolyester technology.

Collaborations

Hirahara has collaborated with esteemed colleagues, including Katsuji Tanaka and Hitoshi Matsumoto. These partnerships have fostered a creative environment that has led to innovative solutions in the field of materials science.

Conclusion

Takuji Hirahara's contributions to copolyester technology and his impressive portfolio of patents highlight his role as a leading inventor in the industry. His work continues to influence advancements in materials science and related fields.

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]