Kanagawa, Japan

Hiroyuki Hirai

This inventor holds 94 USPTO granted patents and 1 published patent application and 2 EPO patents, primarily in Color Photosensitive Materials (CPC class 430203). Top assignees: Fuji Photo Film Company, Limited, Fujifilm Corporation. Active years: 1979-2012.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Hiroyuki Hirai. Retrieved from https://idiyas.com/inventor/hiroyuki-hirai

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

USPTO Granted Patents = 94 

% Patents Active = 89.4

 

Average Co-Inventor Count = 2.3

ph-index = 15

Forward Citations = 1,250(Granted Patents)

Forward Citations (Not Self Cited) = 1,171(Dec 10, 2025)


Inventors with similar research interests:

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Location History:

  • Ashigara, JP (1991)
  • Minami-ashigara, JP (1979 - 2009)
  • Ashigarakami-gun, JP (2011)
  • Kanagawa, JP (1983 - 2012)
  • Kanagawa-ken, JP (2003 - 2012)

Company Filing History:


Years Active: 1979-2012

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Areas of Expertise:
Color Photosensitive Material
Light-Emitting Element
Transparent Conductive Film
Image Forming Method
Doped-Type Metal Sulfide
Silver Halide
Nanoparticles
Optical Recording Medium
Fine Particle Composition
Color Filter
Magnetic Composite Body
Metallic Nanoparticles
94 patents (USPTO):Explore Patents

Title: Hiroyuki Hirai: Pioneering Innovations and Discoveries

Introduction:

Hiroyuki Hirai is a renowned inventor and patent holder hailing from Kanagawa, Japan. With an impressive portfolio of 94 patents, Hirai has made remarkable contributions to various fields of science and technology. Recognized for his ingenuity and expertise, his latest patents prove his dedication to advancing research and development. Let us delve deeper into his inventions, career highlights, and collaborations.

Latest Patents:

1. Method for detecting target compound: This patent presents a method for detecting a target compound using magnetic nano-particles. By injecting a test liquid containing the target compound into a colloid solution of magnetic nano-particles, bound magnetic nano-particles are formed. These particles are brought in proximity to a magnetic sensor, allowing for the selective detection of the bound magnetic nano-particles and, subsequently, the target compound.

2. Process for producing oriented inorganic crystalline film: This patent introduces a technique for producing an oriented inorganic crystalline film. By forming a non-monocrystalline film containing inorganic crystalline particles using a liquid phase technique, the film is then crystallized by heating it. This process results in the formation of crystal nuclei, contributing to the production of oriented inorganic crystalline films with layered crystal structures.

Career Highlights:

Hiroyuki Hirai has had a distinguished career, making notable contributions to the technological community. Having worked at prominent companies such as Fuji Photo Film Company, Limited (now Fujifilm Corporation), his expertise has greatly influenced the development of innovative solutions in the industry. Through his research and inventions, he has pushed the boundaries of scientific exploration and practical applications.

Collaborations:

Throughout his career, Hiroyuki Hirai has collaborated with esteemed colleagues in his pursuit of groundbreaking innovations. Notably, he has worked alongside Kozo Sato and Ken Kawata, both well-respected experts in their respective fields. These collaborations have fostered an environment of knowledge-sharing and have facilitated remarkable advancements in various scientific areas.

Conclusion:

Hiroyuki Hirai's journey as an inventor and patent holder showcases his unwavering commitment to pushing the boundaries of technological progress. With his extensive portfolio of 94 patents, his latest inventions display his expertise in areas such as compound detection and the production of oriented inorganic crystalline films. Hirai's contributions, coupled with his collaborations with esteemed colleagues, have undoubtedly played a vital role in shaping the landscape of innovation. We eagerly await his future endeavors, confident in his ability to continue revolutionizing the world of inventions and patents.

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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