Kazumi Kasai

This inventor holds 54 USPTO granted patents, primarily in Buckle Design (CPC class 2419). Top assignees: Yoshida Kogyo K.k., Nippon Notion Kogyo Co., Ltd., Nippon Notion Koygo Co., Ltd.. Active years: 1978-1991.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Kazumi Kasai. Retrieved from https://idiyas.com/inventor/kazumi-kasai

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

USPTO Granted Patents = 54

% Patents Active = 100.0

Average Co-Inventor Count = 1.0

ph-index = 20

Forward Citations = 929(Granted Patents)

Forward Citations (Not Self Cited) = 908(Dec 10, 2025)

Inventors with similar research interests:

Location History:

Toyama, JP (1984 - 1987)
Namerikawa, JP (1978 - 1991)

Company Filing History:

Nippon Notion Kogyo Co., Ltd.

patents

1 out of 1

Nippon Notion Koygo Co., Ltd.

patent

Years Active: 1978-1991

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Areas of Expertise:

Buckle

Snap Buckle

Strap Fastener

Belt Adjuster

Swivel Joint

Cord Tightening Device

Snap Hook

Eyelet Assembly

Releasable Buckle

Hanging Hook

Plug and Socket Assembly

Watertight Fastener

54 patents (USPTO):Sort by Forward CitationsExplore Patents

1. D320178 - Buckle (1991-09-24),

2. 5033171 - Buckle for connecting two straps or the like (1991-07-23),

3. 4999886 - Plug and socket buckle assembly (1991-03-19),

4. 4987661 - Snap Buckle (1991-01-29),

5. 4982480 - Pair of snappingly engageable members (1991-01-08),

6. 4945614 - Buckle assembly (1990-08-07),

7. 4928365 - Buckle (1990-05-29),

8. 4903378 - Strap adjustment assembly (1990-02-27),

9. 4894890 - Buckle assembly (1990-01-23),

10. 4891866 - Buckle of synthetic resin (1990-01-09),

11. 4888858 - Buckle assembly (1989-12-26),

12. 4868954 - Swivel joint assembly (1989-09-26),

13. 4866819 - Buckle assembly (1989-09-19),

14. 4864700 - Buckle assembly (1989-09-12),

15. 4819306 - Swivel joint (1989-04-11),

Title: The Innovative Inventor: Kazumi Kasai

Introduction:

Kazumi Kasai, a prolific inventor hailing from Namerikawa, Japan, has left a remarkable impact on the world of patents with his impressive portfolio of 54 groundbreaking inventions.

Latest Patents:

Among his latest patents, one that stands out is the innovative "Buckle for connecting two straps or the like." This buckle design revolutionizes strap connections with its unique plug and socket mechanism, showcasing Kasai's creativity and attention to detail.

Career Highlights:

Throughout his career, Kazumi Kasai has demonstrated a keen sense of innovation and problem-solving. His work at companies like Yoshida Kogyo K.K. and Nippon Notion Kogyo Co., Ltd. has been instrumental in driving forward technological advancements in the field of fastening solutions.

Collaborations:

Kasai's collaborative efforts with renowned companies have led to the development of cutting-edge products and solutions. His ability to work seamlessly with industry leaders underscores his reputation as a visionary inventor with a collaborative spirit.

Conclusion:

In conclusion, Kazumi Kasai's journey as an inventor is a testament to his dedication to innovation and his passion for creating practical solutions to everyday challenges. His contributions to the world of patents continue to inspire future generations of inventors to push the boundaries of what is possible.

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]