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For the Inventor, By the Inventor

Shizuoka, Japan

Masanori Takatsuka

This inventor holds 6 USPTO granted patents. Top assignee: Yamaha Corporation. Active years: 1989-1995.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Masanori Takatsuka. Retrieved from https://idiyas.com/inventor/masanori-takatsuka

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

Calculating rank
USPTO Granted Patents = 6

% Patents Active = 100.0

Average Co-Inventor Count = 1.2

ph-index = 4

Forward Citations = 55(Granted Patents)


Location History:

  • Hamamatsu, JP (1989 - 1994)
  • Shizuoka, JP (1989 - 1995)

Company Filing History:

goldMedal6 out of 5,505 
 
Yamaha Corporation
 patents

Years Active: 1989-1995

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6 patents (USPTO):Explore Patents
1. 5470062 - Tennis racket (1995-11-28),
2. 5462274 - Tennis racket with longitudinal strings different in tensile force from (1995-10-31),
3. 5310179 - Tennis racket (1994-05-10),
4. 5211398 - Hollow tennis racket frame with matched frequency of vibration (1993-05-18),
5. 4861029 - Racket frame (1989-08-29),
6. 4811947 - Vibration absorber for a racket (1989-03-14),

Title: Masanori Takatsuka: Innovator in Tennis Racket Technology

Introduction

Masanori Takatsuka is a prominent inventor based in Shizuoka, Japan. He has made significant contributions to the field of sports equipment, particularly in the design and functionality of tennis rackets. With a total of 6 patents to his name, Takatsuka's innovations have enhanced the performance and user experience of tennis players.

Latest Patents

One of Takatsuka's latest patents involves a unique construction of a tennis racket that features balance adjusters with specific gravities larger than that of the frame. These adjusters are strategically placed at the frame top and the yoke, improving repulsion characteristics and mitigating vibratory impact during off-spot shots. This design ensures a long and speedy flight of balls while reducing physical strain on players. Another notable patent describes a tennis racket with longitudinal strings that have varying tensile forces. The ratio of tensile force between the longitudinal and transversal strings ranges from 2.5:1 to 4.0:1, allowing for a nodal line for vibrations in the secondary mode to pass through the sweet area, thereby decreasing the reaction from the racket upon impact with a tennis ball.

Career Highlights

Masanori Takatsuka is associated with Yamaha Corporation, a company renowned for its innovative approach to musical instruments and sports equipment. His work at Yamaha has allowed him to explore and develop advanced technologies that enhance athletic performance.

Collaborations

Throughout his career, Takatsuka has collaborated with talented individuals such as Yoshinori Hariguchi and Tetsuyuki Awano. These collaborations have fostered a creative environment that encourages the development of cutting-edge sports technologies.

Conclusion

Masanori Takatsuka's contributions to tennis racket technology exemplify his commitment to innovation and excellence in sports equipment design. His patents reflect a deep understanding of the mechanics involved in tennis, ultimately benefiting players around the world.

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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