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For the Inventor, By the Inventor

Iwaki, Japan

Zenya Shiiki

This inventor holds 72 USPTO granted patents, primarily in Polymer Materials (CPC class 2642). Top assignees: Kureha Kagaku Kogyo K.k., Kureha Kagaku Kogyo Kabushiki Kaisha, Toyo Boseki Kabushiki Kaisha. Active years: 1976-2004.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Zenya Shiiki. Retrieved from https://idiyas.com/inventor/zenya-shiiki

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

USPTO Granted Patents = 72

% Patents Active = 100.0

Average Co-Inventor Count = 3.8

ph-index = 21

Forward Citations = 1,096(Granted Patents)

Forward Citations (Not Self Cited) = 953(Dec 10, 2025)


Inventors with similar research interests:


Location History:

  • Tokyo, JA (1976 - 1977)
  • Fukushima, JP (1987 - 1989)
  • Iwaki, JP (1981 - 1996)
  • Fukushima-ken, JP (1997)
  • Chiba, JP (1998 - 2001)
  • Narashino, JP (1990 - 2004)

Company Filing History:

goldMedal36 out of 137 
 
Kureha Kagaku Kogyo K.k.
 patents
silverMedal36 out of 776 
 
Kureha Kagaku Kogyo Kabushiki Kaisha
 patents
bronzeMedal3 out of 789 
 
Toyo Boseki Kabushiki Kaisha
 patents
4. 1 out of 381 
 
Polyplastics Co., Ltd.
 patents
where one patent can have more than one assignee

Years Active: 1976-2004

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Areas of Expertise:
Gas-Barrier Film
Polyglycolic Acid
Poly(arylene Thioether)
Injection-Molded Products
Thermoplastic Resin
Composite Film
Heat-Resistant Resin
Molded Articles
Stretch Blow Molded Container
Production Process
Block Copolymer
Fibers
72 patents (USPTO):Explore Patents
1. 6673403 - Gas-barrier, multi-layer hollow container (2004-01-06),
2. 6245437 - Gas-barrier composite film (2001-06-12),
3. 6183679 - Production process for injection-molded product of polyglycolic acid (2001-02-06),
4. 6159416 - Stretch blow molded container and production process thereof (2000-12-12),
5. 6046251 - Injection-molded product of polyglycolic acid and production process (2000-04-04),
6. 6001439 - Stretch blow molded container and production process thereof (1999-12-14),
7. 5908917 - Polyglycolic acid sheet and production process thereof (1999-06-01),
8. 5853639 - Oriented polyglycolic acid film and production process thereof (1998-12-29),
9. 5830991 - Preparation process and purification process of dimeric cyclic ester of (1998-11-03),
10. 5688586 - Poly(ethylene oxalate), product formed of molded therefrom and (1997-11-18),
11. 5484876 - Production process for aromatic thioether ketone/thioether sulfone (1996-01-16),
12. 5408014 - Aromatic thioether ketone/thioether sulfone copolymer products (1995-04-18),
13. 5369191 - Aromatic thioether ketone/thioether sulfone copolymer and production (1994-11-29),
14. 5312894 - Granular high-melt-stable poly(arylene thioether-ketone) and production (1994-05-17),
15. 5200501 - Easily-slidable polyarylene thioether film and process for producing the (1993-04-06),

Title: The Innovative Contributions of Zenya Shiiki

Introduction

Zenya Shiiki, an esteemed inventor based in Iwaki, Japan, has made significant strides in the field of material science and engineering, evidenced by his impressive portfolio of 72 patents. His innovative work focuses primarily on gas-barrier technologies, which have wide-ranging applications in packaging and preservation.

Latest Patents

Shiiki's latest inventions include a notable gas-barrier multi-layer hollow container and a gas-barrier composite film. The composite gas barrier film features a layer structure that incorporates a thermoplastic resin film laminated onto a film formed from polyglycolic acid, which contains at least 60 wt. % of a repeating unit represented by a specific formula. These advancements in composite materials serve to enhance the protection of sensitive products from gas permeation, ultimately extending their shelf life and usability.

Career Highlights

Throughout his career, Zenya Shiiki has been associated with prominent organizations, including Kureha Kagaku Kogyo Kabushiki Kaisha and Kureha Kagaku Kogyo K.K. His tenure in these companies has facilitated a platform for his research and development, driving forward innovative solutions in material chemistry and engineering.

Collaborations

Shiiki has worked alongside talented colleagues such as Takayuki Katto and Yo Iizuka, contributing to collaborative efforts in advancing technologies related to gas-barrier materials. His partnerships with fellow innovators have fostered an environment of creativity and shared expertise, leading to the evolution of groundbreaking inventions.

Conclusion

Zenya Shiiki stands out as a leading inventor in his field, demonstrating the profound impact of innovations in gas-barrier technologies. With a legacy that includes numerous patents and successful collaborations, his contributions continue to influence the future of material sciences and industrial applications.

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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