Masaharu Shirai

This inventor holds 15 USPTO granted patents. Top assignees: International Business Machines Corporation, Kyocera Corporation. Active years: 1993-2013.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Masaharu Shirai. Retrieved from https://idiyas.com/inventor/masaharu-shirai

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

USPTO Granted Patents = 15

% Patents Active = 80.0

Average Co-Inventor Count = 1.9

ph-index = 6

Forward Citations = 88(Granted Patents)

Location History:

Ohtsu, JP (1993 - 1996)
Kusatsu, JP (1998 - 2003)
Shiga, JP (2011)
Yasu, JP (2012 - 2013)

Company Filing History:

12 out of 166,351

International Business Machines Corporation

Years Active: 1993-2013

Loading Chart...

15 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 8446734 - Circuit board and mounting structure (2013-05-21),

2. 8129623 - Resin film, adhesive sheet, circuit board, and electronic apparatus (2012-03-06),

3. 8012561 - Fiber-reinforced resin and method for manufacturing the same (2011-09-06),

4. 6612028 - Method for manufacturing a built-up circuit board (2003-09-02),

5. 6338937 - Lithography method and method for producing a wiring board (2002-01-15),

6. 6048465 - Circuit board and fabrication method thereof (2000-04-11),

7. 5998739 - Stepped configured circuit board (1999-12-07),

8. 5784781 - Manufacturing process for organic chip carrier (1998-07-28),

9. 5776662 - Method for fabricating a chip carrier with migration barrier, and (1998-07-07),

10. 5766825 - Method of forming a resin laying in a surface laminated circuit (1998-06-16),

11. 5537740 - Method of making printed circuit board (1996-07-23),

12. 5517756 - Method of making substrate member having electrical lines and apertured (1996-05-21),

13. 5510580 - Printed circuit board with landless blind hole for connecting an upper (1996-04-23),

14. 5460858 - Method for forming a smooth-surfaced insulating layer (1995-10-24),

15. 5252781 - Substrate member having electric lines and apertured insulating film (1993-10-12),

Title: Masaharu Shirai: Innovator in Circuit Board Technology

Introduction

Masaharu Shirai is a prominent inventor based in Kusatsu, Japan. He has made significant contributions to the field of circuit board technology, holding a total of 15 patents. His innovative designs focus on enhancing the reliability and efficiency of electronic components.

Latest Patents

Shirai's latest patents include a groundbreaking circuit board and mounting structure. This invention features a high-density circuit with excellent connection reliability and lamination reliability. The design incorporates a resin fabric cloth made by arranging single fibers or fiber bundles, which possess a linear thermal expansion coefficient smaller than that of silicon. This unique arrangement is alternately woven in at least two directions. Additionally, the resin fabric cloth is covered with a resin portion made from a material that has a larger linear thermal expansion coefficient than silicon.

Another notable patent involves a resin film, adhesive sheet, circuit board, and electronic apparatus. This invention focuses on a resin film that exhibits high adhesiveness to other materials. The adhesive layer and resin film are firmly adhered, ensuring durability. The resin film includes multiple projected portions, each containing a filler in the apex portion, enhancing its functionality.

Career Highlights

Throughout his career, Masaharu Shirai has worked with esteemed companies such as IBM and Kyocera Corporation. His experience in these organizations has allowed him to refine his skills and contribute to significant advancements in technology.

Collaborations

Shirai has collaborated with notable coworkers, including Yutaka Tsukada and Shuhei Tsuchita. Their combined expertise has fostered innovation and development in their respective fields.

Conclusion

Masaharu Shirai's contributions to circuit board technology exemplify his dedication to innovation. His patents reflect a commitment to improving electronic components, making him a significant figure in the industry.

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]