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For the Inventor, By the Inventor

Nagoya, Japan

Issei Hayakawa

This inventor holds 8 USPTO granted patents. Top assignee: Ngk Insulators, Inc.. Active years: 1981-1991.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Issei Hayakawa. Retrieved from https://idiyas.com/inventor/issei-hayakawa

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

USPTO Granted Patents = 8

% Patents Active = 100.0

Average Co-Inventor Count = 1.8

ph-index = 7

Forward Citations = 104(Granted Patents)


Location History:

  • Tsushima, JP (1981)
  • Nagoya, JP (1988 - 1991)

Company Filing History:

goldMedal8 out of 5,088 
 
Ngk Insulators, Inc.
 patents

Years Active: 1981-1991

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8 patents (USPTO):Explore Patents
1. 5017531 - Silicon nitride ceramic sintered bodies (1991-05-21),
2. 5015608 - High hardness silicon nitride sintered bodies (1991-05-14),
3. 5002907 - Homogenous silicon nitride sintered body (1991-03-26),
4. 4871697 - Method of producing homogeneous silicon nitride sintered bodies (1989-10-03),
5. 4820665 - Ceramic sintered bodies and a process for manufacturing the same (1989-04-11),
6. 4810681 - Method of manufacturing dense cordierite (1989-03-07),
7. 4742759 - Ceramic insert cast piston (1988-05-10),
8. 4273587 - Polycrystalline transparent spinel sintered body and a method for (1981-06-16),

Title: The Innovations of Issei Hayakawa

Introduction

Issei Hayakawa is a prominent inventor based in Nagoya, Japan. He has made significant contributions to the field of ceramics, particularly in the development of high-density fine ceramic sintered bodies and silicon nitride materials. With a total of 8 patents to his name, Hayakawa's work has had a substantial impact on various industrial applications.

Latest Patents

One of Hayakawa's latest patents involves the creation of silicon nitride ceramic sintered bodies. These high-density fine ceramic sintered bodies are characterized by a maximum pore diameter of not more than 10 µm and a porosity of not more than 0.5%. The process for producing these bodies includes mixing a ceramic raw material powder with a sintering aid, grinding the mixture, granulating and shaping it, and finally firing the shaped body. The granulated powder is forcedly dried and, if necessary, water is added to achieve a uniform granulated powder with a specific moisture content. Another notable patent is for a high hardness silicon nitride sintered body, which contains 10 to 50% of α-Si3N4 by total weight and boasts a Knoop hardness of not less than 15.5 GPa. This material is particularly useful as a bearing material.

Career Highlights

Hayakawa is currently employed at NGK Insulators, Inc., where he continues to innovate and develop advanced ceramic materials. His work has been instrumental in enhancing the performance and durability of ceramic products used in various applications.

Collaborations

Throughout his career, Hayakawa has collaborated with notable colleagues, including Tadaaki Matsuhisa and Noriyuki Ukai. These collaborations have further enriched his research and development efforts in the field of ceramics.

Conclusion

Issei Hayakawa's contributions to the field of ceramics through his innovative patents and collaborations highlight his importance as an inventor. His work continues to influence the industry and pave the way for future advancements in ceramic materials.

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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