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For the Inventor, By the Inventor

Saitama, Japan

Takashi Iizuka

This inventor holds 116 USPTO granted patents and 6 published patent applications and 14 EPO patents, primarily in Optical Systems (CPC class 359216). Top assignees: Asahi Kogaku Kogyo Kabushiki Kaisha, Pentax Corporation, Zeon Corporation. Active years: 1989-2025.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Takashi Iizuka. Retrieved from https://idiyas.com/inventor/takashi-iizuka

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

USPTO Granted Patents = 116 

% Patents Active = 83.6

 

Average Co-Inventor Count = 1.5

ph-index = 14

Forward Citations = 704(Granted Patents)

Forward Citations (Not Self Cited) = 664(Dec 10, 2025)


Inventors with similar research interests:

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Location History:

  • Shiki, JP (1991 - 1992)
  • Saitama-ken, JP (1999 - 2008)
  • Saitama, JP (2011 - 2016)
  • Chiyoda-ku, JP (2019)
  • Tokyo, JP (1989 - 2024)

Company Filing History:

goldMedal69 out of 3,132 
 
Asahi Kogaku Kogyo Kabushiki Kaisha
 patents
silverMedal20 out of 1,056 
 
Pentax Corporation
 patents
bronzeMedal8 out of 1,294 
 
Zeon Corporation
 patents
4. 4 out of 176 
 
Asahi Kogaku Kogyo K.k.
 patents
5. 4 out of 3,208 
 
Dai Nippon Printing Co., Ltd.
 patents
6. 3 out of 6,961 
 
Sumitomo Chemical Company, Limited
 patents
7. 3 out of 5 
 
Zs Elastomers Co., Ltd.
 patents
8. 2 out of 2,566 
 
Hoya Corporation
 patents
9. 2 out of 152 
 
Hoya Lens Thailand Ltd.
 patents
10. 2 out of 264 
 
Sega Enterprises, Ltd.
 patents
11. 2 out of 2,451 
 
Subaru Corporation
 patents
12. 1 out of 145 
 
Kabushiki Kaisha Sega Enterprises
 patents
13. 1 out of 1 
 
Mimiworks Co., Ltd.
 patent
14. 1 out of 145 
 
Sega Corporation
 patents
where one patent can have more than one assignee

Years Active: 1989-2025

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Areas of Expertise:
Refractive Measurement
Conjugated Diene Rubber
Optical Systems
Laser Imaging
Multibeam Optical System
Hydraulic Transfer Film
Nitrile Copolymer
Game Control Methods
Scanning Optical Element
Adhesion Observation
Profile Information Exchange
Manufacturing Methods
116 patents (USPTO):Explore Patents
1. 12279821 - Refractive property measurement device, measurement tool, and refractive property measurement method (2025-04-21),
2. 12245814 - Refraction measuring apparatus (2025-03-11),
3. 12188872 - Adhesion interface observation method (2025-01-07),
4. 11873364 - Method for producing conjugated diene rubber (2024-01-16),
5. 11566094 - Modified conjugated diene rubber (2023-01-31),
6. 11530287 - Conjugated-diene-based rubber (2022-12-20),
7. 11407056 - Pierce metal for joining different materials and method of joining different materials using pierce metal (2022-08-09),
8. 10614276 - Profile information exchange system (2020-04-07),
9. 10308832 - Hydraulic transfer film and molded product decorated using same (2019-06-04),
10. 10266613 - Conjugated diene polymer and method of production of conjugated diene polymer (2019-04-23),
11. 10239983 - Method for production of conjugated diene rubber (2019-03-26),
12. 9982065 - Method of production of conjugated diene rubber (2018-05-29),
13. 9868794 - Method for producing conjugated diene rubber (2018-01-16),
14. 9259908 - Shaping sheet, resin decorative plate and method for manufacturing the same (2016-02-16),
15. 9120248 - Shaped sheet (2015-09-01),

Title: Innovator Spotlight: Takashi Iizuka

Introduction: Takashi Iizuka, a prolific inventor hailing from Saitama-ken, Japan, has made significant contributions to the field of rubber production with a total of 113 patents under his belt.

Latest Patents: Among his latest patents is a groundbreaking "Method for producing conjugated diene rubber," which outlines a novel process for creating conjugated diene rubber utilizing a specialized sequence of steps. Additionally, Iizuka has patented a "Modified conjugated diene rubber," showcasing his expertise in developing innovative rubber formulations.

Career Highlights: Iizuka has showcased his inventive prowess while working at renowned companies such as Asahi Kogaku Kogyo Kabushiki Kaisha and Pentax Corporation. His dedication to advancing rubber technology has led to numerous patents and industry advancements.

Collaborations: Throughout his career, Iizuka has collaborated closely with esteemed colleagues such as Tsutomu Sato and Mitsunori Iima, underscoring his commitment to teamwork and shared innovation in the field of rubber manufacturing.

Conclusion: Takashi Iizuka's tireless dedication to pushing the boundaries of rubber production and his numerous patents stand as a testament to his innovative spirit and invaluable contributions to the industry.

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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