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For the Inventor, By the Inventor

Tokyo, Japan

Keiichi Takanashi

This inventor holds 35 USPTO granted patents and 8 published patent applications, primarily in Silicon Crystal Manufacturing. Top assignees: Sumco Corporation, Sumco Phoenix Corporation, Sumitomo Metal Industries, Inc.. Active years: 2000-2026.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Keiichi Takanashi. Retrieved from https://idiyas.com/inventor/keiichi-takanashi

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

Calculating rank
USPTO Granted Patents = 35 

% Patents Active = 91.4

Average Co-Inventor Count = 2.1

ph-index = 4

Forward Citations = 43(Granted Patents)


Location History:

  • Hyogo, JP (2001)
  • Nishinomiya, JP (2000 - 2007)
  • Tokyo, JP (2007 - 2023)
  • Saga, JP (2011 - 2023)

Company Filing History:

goldMedal29 out of 626 
 
Sumco Corporation
 patents
silverMedal6 out of 8 
 
Sumco Phoenix Corporation
 patents
bronzeMedal3 out of 929 
 
Sumitomo Metal Industries, Inc.
 patents
4. 2 out of 90 
 
Sumitomo Mitsubishi Silicon Corporation
 patents
where one patent can have more than one assignee

Years Active: 2000-2026

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Areas of Expertise:
Single Crystal
Monocrystalline Silicon
Wafer Polishing
Crystal Growth
Defect-Free Manufacturing
Transmittance Measurement
Silicon Wafer
Pulling Method
Thermal Gradients
Diameter Control
Melt Level Control
Position Measurement
35 patents (USPTO):Explore Patents
1. 12774987 - Method of estimating oxygen concentration in silicon single crystal, method of manufacturing silicon single crystal, and silicon single crystal manufacturing apparatus (2026-10-27),
2. 12757678 - Packaging unit and transportation container (2026-10-06),
3. 12686942 - Manufacturing method of single crystals (2026-07-21),
4. 12546029 - System and method for producing single crystal (2026-02-10),
5. 12435443 - Method and apparatus for manufacturing defect-free monocrystalline silicon crystal (2025-10-07),
6. 11826870 - Apparatus and method for double-side polishing work (2023-11-28),
7. 11717931 - Apparatus and method for double-side polishing work (2023-08-08),
8. 11703452 - Method and apparatus for measuring transmittance of quartz crucible (2023-07-18),
9. 11618971 - Method and apparatus for manufacturing defect-free monocrystalline silicon crystal (2023-04-04),
10. 11361462 - Method of evaluating inner circumference of quartz crucible and quartz crucible inner circumference evaluation apparatus (2022-06-14),
11. 10903099 - Semiconductor wafer placement position determination method and semiconductor epitaxial wafer production method (2021-01-26),
12. 10472733 - Silicon single crystal manufacturing method (2019-11-12),
13. 10261125 - Semiconductor wafer evaluation standard setting method, semiconductor wafer evaluation method, semiconductor wafer manufacturing process evaluation method, and semiconductor wafer manufacturing method (2019-04-16),
14. 9816199 - Method of manufacturing single crystal (2017-11-14),
15. 9708731 - Method of producing silicon single crystal (2017-07-18),

Title: Keiichi Takanashi: Innovator in Double-Side Polishing Technology

Introduction

Keiichi Takanashi, a prominent inventor based in Tokyo, Japan, has made significant contributions to the field of manufacturing technology. With an impressive portfolio of 30 patents, Takanashi has focused particularly on innovations related to double-side polishing apparatuses and methods, which are crucial in various precision engineering sectors.

Latest Patents

Among Takanashi's most recent inventions is a sophisticated apparatus and method for double-side polishing work. This innovative device is designed to enhance the efficiency and effectiveness of the polishing process. The method employs a computing unit that performs several critical steps, including grouping thickness data, extracting shape components, identifying positions in the radial direction, computing shape distributions, and obtaining a shape index. This comprehensive approach enables the precise determination of when to terminate the double-side polishing process, ensuring that the work meets its target shape efficiently.

Career Highlights

Throughout his career, Keiichi Takanashi has worked with notable organizations such as Sumco Corporation and Sumco Phoenix Corporation. His involvement with these companies has allowed him to refine his expertise and develop cutting-edge technologies that cater to the growing demands of the market. Takanashi's contributions are vital in advancing the manufacturing techniques used in various industries.

Collaborations

Takanashi’s work has been enriched by collaborations with talented colleagues in the field, including Ken Hamada and Benno Orschel. These partnerships have fostered an environment of innovation, allowing for the exchange of ideas and technical knowledge that drive forward-thinking solutions in polishing technology.

Conclusion

Keiichi Takanashi stands as a highly inventive figure in the realm of double-side polishing technology, with a robust portfolio of patents that reflect his dedication to advancing manufacturing processes. His continued commitment to innovation not only enhances the capabilities of the technology but also positions him as a key player in the engineering landscape.

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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