Hiroyuki Kawai

This inventor holds 22 USPTO granted patents and 1 published patent application, plus 2 CIPO patents and 14 EPO patents, primarily in Battery Separator Technology. Top assignees: Kuraray Co., Ltd., Matsushita Electric Industrial Co., Ltd., Panasonic Corporation. Active years: 1994-2025.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Hiroyuki Kawai. Retrieved from https://idiyas.com/inventor/hiroyuki-kawai-330cvi22

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

USPTO Granted Patents = 22 (Patent Applications = 1)

% Patents Active = 77.3

CIPO Patents = 2 (Patent Applications = 2)

EPO Patents = 14 (Patent Applications = 10)

Average Co-Inventor Count = 4.2

ph-index = 3

Forward Citations = 80(Granted Patents)

Location History:

Osaka, JP (2010 - 2016)
Kurashiki, JP (2020 - 2021)
Okayama, JP (1994 - 2024)

Company Filing History:

Matsushita Electric Industrial Co., Ltd.

patents

1 out of 16,454

Panasonic Corporation

patents

where one patent can have more than one assignee

Years Active: 1994-2025

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Areas of Expertise:

Alkaline Battery

Battery Separator

Filtration Material

Polyvinyl Alcohol Fiber

Carbon Fiber

Nonaqueous Cell

Electric Double Layer Capacitor

Reinforcing Fiber

Molded Article

Production Method

Synthetic Fiber

Separator Composition

22 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 12460111 - Reinforcing fibers and production method therefor, and molded article using same (2025-11-04),

2. 12435195 - Surface-modified fibers, reinforcing fibers, and molded article using same (2025-10-07),

3. 12410555 - Metal-covered liquid crystal polyester multifilament (2025-09-09),

4. 11936067 - Alkaline battery separator and method for producing same (2024-03-19),

5. 11884788 - Reinforcing fiber, method for manufacturing same, and molded body using same (2024-01-30),

6. 11450922 - Separator, and separator for alkaline manganese dry battery comprising same (2022-09-20),

7. 11053610 - Readily fibrillative polyvinyl alcohol fiber and method for manufacturing same (2021-07-06),

8. 10533287 - Dispersant for carbon fibers, carbon fiber dispersion composition, and method for manufacturing carbon fiber sheet (2020-01-14),

9. 10461294 - Separator for alkaline batteries, and alkaline battery using same (2019-10-29),

10. 10446820 - Alkaline battery separator (2019-10-15),

11. 10106923 - Extra-fine fiber sheet (2018-10-23),

12. 10020124 - Separator for electric double layer capacitors, and electric double layer capacitor (2018-07-10),

13. 9748543 - Separator for nonaqueous cell and nonaqueous cell (2017-08-29),

14. 9498742 - Filtration material for filters, and filter cartridge (2016-11-22),

15. 9343721 - Separator for non-aqueous batteries and non-aqueous battery equipped with same, and process for manufacturing separator for non-aqueous batteries (2016-05-17),

Title: Hiroyuki Kawai: Innovator in Battery Separator Technology

Introduction

Hiroyuki Kawai is a distinguished inventor based in Okayama, Japan, with a remarkable portfolio featuring 19 patents. His contributions primarily focus on advancements in battery technology, specifically in the development of alkaline battery separators and reinforcing fibers.

Latest Patents

Kawai's most recent innovations include two significant patents. The first is for an alkaline battery separator designed to enhance battery performance. This separator consists of an alkali-resistant fiber and a binder, featuring two distinct surfaces: surface A, which is smoother, and surface B, which is rougher. The patent details specific measurements for surface roughness and the optimal binder content, ensuring high efficiency in battery applications.

The second patent pertains to reinforcing fibers that utilize an adhesive component free from resorcinol and formaldehyde. These fibers exhibit excellent adhesion properties to rubber and allow for efficient production while minimizing contamination risks in manufacturing facilities. The adhesive component comprises conjugated diene rubber and a specific oil formulation, optimizing the fibers for various industrial uses.

Career Highlights

Throughout his career, Hiroyuki Kawai has made significant contributions to renowned companies such as Kuraray Co., Ltd. and Matsushita Electric Industrial Co., Ltd. His work in these organizations has established him as a leader in innovative materials and technologies, particularly in the battery sector.

Collaborations

Kawai has collaborated with notable professionals in the field, including Tomohiro Hayakawa and Hideo Hayashi. These collaborations have been pivotal in driving forward the development of advanced technologies in battery and material sciences.

Conclusion

In conclusion, Hiroyuki Kawai's body of work and innovative spirit have greatly influenced the field of battery technology, underscoring his role as a key inventor in improving energy storage solutions. His patents reflect a commitment to advancing technology and enhancing performance in various applications.

Profile summary based on public USPTO records.