Toshiaki Ishimaru

This inventor holds 16 USPTO granted patents, primarily in Printed Circuit Boards. Top assignees: Hitachi Chemical Company, Ltd., Hitachi, Ltd.. Active years: 1977-1999.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Toshiaki Ishimaru. Retrieved from https://idiyas.com/inventor/toshiaki-ishimaru-z55a9eiz

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

Calculating rank

USPTO Granted Patents = 16

% Patents Active = 100.0

Average Co-Inventor Count = 4.6

ph-index = 8

Forward Citations = 199(Granted Patents)

Location History:

Hitachi, JA (1977)
Hitachi, JP (1978 - 1999)

Company Filing History:

14 out of 1,641

Hitachi Chemical Company, Ltd.

where one patent can have more than one assignee

Years Active: 1977-1999

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Areas of Expertise:

Printed Wiring Board

Printed Circuit Board

Photosensitive Resin

Flexible Circuit Board

Adhesive Film

Soldering Mask

Polyesteramides

Monofunctional Monomer

Film-Laminated Base Plates

Manufacturing Process

Resin Composition

Element Preparation

16 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 5919603 - Process for producing printed wiring board (1999-07-06),

2. 5712080 - Method for manufacturing printed circuit board (1998-01-27),

3. 5476690 - Process for preparing printed circuit board (1995-12-19),

4. 5438751 - Process for producing printed wiring board (1995-08-08),

5. 5262277 - Photosensitive resin composition and photosensitive element using the (1993-11-16),

6. 5028513 - Process for producing printed circuit board (1991-07-02),

7. 4544625 - Photosensitive resin composition and photosensitive element (1985-10-01),

8. 4499163 - Soldering mask formed from a photosensitive resin composition and a (1985-02-12),

9. 4438190 - Photosensitive resin composition containing unsaturated monomers and (1984-03-20),

10. 4312916 - Process for producing adhesive film (1982-01-26),

11. 4302268 - Process for preparing flexible printed-circuit board (1981-11-24),

12. 4272607 - Photosensitive resin composition (1981-06-09),

13. 4237251 - Polyesteramides and process for producing the same (1980-12-02),

14. 4108666 - Monofunctional monomer-containing photosensitive composition for (1978-08-22),

15. 4101364 - Method of an apparatus for producing film-laminated base plates (1978-07-18),

Title: Toshiaki Ishimaru: Innovator in Printed Circuit Board Technology

Introduction

Toshiaki Ishimaru is a prominent inventor based in Hitachi, Japan. He has made significant contributions to the field of printed circuit board technology, holding a total of 16 patents. His innovative approaches have simplified production processes and improved the efficiency of manufacturing.

Latest Patents

Ishimaru's latest patents include a process for producing printed wiring boards. This additive process utilizes a developer that comprises a chlorine-free organic solvent and an alkaline aqueous solution. By employing a copolymer of methacrylic acid and methyl methacrylate as the resist material, the production steps are simplified, even for large-area substrates. Another notable patent is a method for manufacturing printed circuit boards. This method involves forming a wiring pattern through chemical metal plating using a negative pattern made from a photosensitive resin composition layer as the plating resist. The photosensitive resin includes a linear high polymer and an organic compound, enhancing the manufacturing process.

Career Highlights

Throughout his career, Toshiaki Ishimaru has worked with notable companies such as Hitachi Chemical Company, Ltd. and Hitachi, Ltd. His experience in these organizations has allowed him to develop and refine his innovative techniques in printed circuit board technology.

Collaborations

Ishimaru has collaborated with esteemed colleagues, including Nobuyuki Hayashi and Katsushige Tsukada. These partnerships have contributed to the advancement of technology in their field.

Conclusion

Toshiaki Ishimaru's contributions to printed circuit board technology through his patents and collaborations highlight his role as a key innovator in the industry. His work continues to influence manufacturing processes and improve efficiency in electronics.

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]