Chichibu, Japan

Yasushi Ichikawa

This inventor holds 103 USPTO granted patents, primarily in Golf Ball Technology (CPC class A63B3-712). Top assignee: Bridgestone Sports Co., Ltd.. Active years: 1996-2011.


% Patents Active = 80.6

Average Co-Inventor Count = 3.1

ph-index = 34

Forward Citations = 2,767(Granted Patents)

Forward Citations (Not Self Cited) = 2,691(Dec 10, 2025)


Inventors with similar research interests:

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Location History:

  • Yokohama, JP (1998 - 2000)
  • Saitama, JP (2000 - 2004)
  • Chichibu, JP (1996 - 2011)

Company Filing History:


Years Active: 1996-2011

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Areas of Expertise:
Multi-Piece Golf Ball
Golf Ball Materials
Solid Golf Ball
Two-Piece Golf Ball
Golf Ball Cover
Golf Ball Composition
Golf Ball Production
Golf Ball Design
Golf Ball Properties
Golf Ball Performance
103 patents (USPTO):Explore Patents

Title: Innovations in Golf: The Contributions of Yasushi Ichikawa

Introduction: Yasushi Ichikawa, hailing from Chichibu, Japan, is a prolific inventor with an impressive portfolio of 103 patents. His groundbreaking work primarily focuses on advancements in golf ball technology, reflecting his commitment to enhancing the game through innovative design and materials.

Latest Patents: Ichikawa's recent patents include a remarkable multi-piece solid golf ball. This design features a core with a complex structure consisting of at least two layers, encased in both outer and inner cover layers. The outer cover layer boasts a Shore D hardness of 40-60 degrees, while the inner cover layer is crafted with a lower hardness of up to 53 degrees. This thoughtful combination enables the golf ball to provide a carry comparable to conventional solid golf balls, while achieving a spin receptivity similar to that of wound golf balls. The ultimate result is a durable product that offers a pleasant feel to the player. Another notable patent covers a similar multi-piece solid golf ball, with a core diameter ranging from 35 to 41 mm. This innovative core comprises an inner sphere made of polybutadiene rubber, further protected by an outer layer made of thermoplastic or rubber-based material, ensuring optimal performance on the greens.

Career Highlights: Yasushi Ichikawa has established his career through his dedication to research and innovation in the sporting goods industry, particularly at Bridgestone Sports Co., Ltd. His persistence in developing superior golf ball technology marks him as a leading figure within the sector, contributing significantly to both player performance and overall enjoyment of the sport.

Collaborations: Ichikawa has collaborated with notable colleagues such as Rinya Takesue and Hisashi Yamagishi. This synergy between motivated inventors has fostered an environment of creativity and innovation, facilitating the development of cutting-edge golf equipment that enhances athletic performance.

Conclusion: Yasushi Ichikawa's contributions to the field of golf through his numerous patents highlight his innovative spirit and dedication to improving sports technology. His work not only advances the game but also sets new benchmarks for quality and performance in golf balls, ultimately benefiting players around the world.

Profile summary based on public USPTO records.
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