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For the Inventor, By the Inventor

Nagano, Japan

Hiromasa Marumo

This inventor holds 6 USPTO granted patents. Top assignees: Sankyo Seiki Mfg. Co., Ltd, Kabushiki Kaisha Sankyo Seiki Seisakusho, K.k. Sankyo Seiki Seisakusho. Active years: 1992-2004.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Hiromasa Marumo. Retrieved from https://idiyas.com/inventor/hiromasa-marumo

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

USPTO Granted Patents = 6

% Patents Active = 100.0

Average Co-Inventor Count = 3.6

ph-index = 4

Forward Citations = 54(Granted Patents)


Location History:

  • Shimosuwa-machi, JP (1998 - 2000)
  • Nagano, JP (1992 - 2004)

Company Filing History:

goldMedal3 out of 264 
 
Sankyo Seiki Mfg. Co., Ltd
 patents
silverMedal2 out of 307 
 
Kabushiki Kaisha Sankyo Seiki Seisakusho
 patents
bronzeMedal1 out of 13 
 
K.k. Sankyo Seiki Seisakusho
 patents
4. 1 out of 64 
 
Shikoku Chemicals Corporation
 patents
where one patent can have more than one assignee

Years Active: 1992-2004

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6 patents (USPTO):Explore Patents
1. 6758597 - Bearing member and method for manufacturing the same and dynamic pressure bearing device (2004-07-06),
2. 6554476 - Dynamic pressure bearing device and method of manufacturing the same (2003-04-29),
3. 6155721 - Dynamic-pressure fluid bearing (2000-12-05),
4. 5763967 - Dynamic-pressure fluid bearing (1998-06-09),
5. 5599864 - Polyarylene sulfide resin composition and optical pick-up parts formed (1997-02-04),
6. 5122896 - Electrochromic display device with the counter electrode being (1992-06-16),

Title: Hiromasa Marumo: Innovator in Bearing Technology

Introduction

Hiromasa Marumo is a notable inventor based in Nagano, Japan. He has made significant contributions to the field of bearing technology, holding a total of 6 patents. His innovative designs focus on enhancing the performance and durability of bearing devices.

Latest Patents

Marumo's latest patents include a "Bearing member and method for manufacturing the same" and a "Dynamic pressure bearing device." The bearing member consists of a cylindrical body made of copper metal, which rotatably supports a shaft member. An anti-rust film comprising cupric benzotriazole is formed on the surface of this cylindrical body. The dynamic pressure bearing device features a shaft member and a thrust plate with a press-fitting portion. This design includes at least two relief portions that help absorb press-fitting stress during assembly.

Career Highlights

Throughout his career, Marumo has worked with prominent companies such as Sankyo Seiki Mfg. Co., Ltd and Kabushiki Kaisha Sankyo Seiki Seisakusho. His work has significantly impacted the development of advanced bearing technologies.

Collaborations

Marumo has collaborated with talented individuals in his field, including Yasushi Mizusaki and Tokuhisa Tsutsui. Their combined expertise has contributed to the success of various projects and innovations.

Conclusion

Hiromasa Marumo's contributions to bearing technology exemplify his dedication to innovation and excellence. His patents and collaborations continue to influence the industry, showcasing the importance of advanced engineering solutions.

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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