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For the Inventor, By the Inventor

Kanagawa, Japan

Shu Watarai

This inventor holds 8 USPTO granted patents. Top assignee: Fuji Photo Film Company, Limited. Active years: 1982-1996.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Shu Watarai. Retrieved from https://idiyas.com/inventor/shu-watarai

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

USPTO Granted Patents = 8

% Patents Active = 100.0

Average Co-Inventor Count = 3.3

ph-index = 5

Forward Citations = 52(Granted Patents)


Location History:

  • Asaka, JP (1982 - 1983)
  • Saitama, JP (1984)
  • Kanagawa, JP (1986 - 1996)

Company Filing History:

goldMedal8 out of 16,458 
 
Fuji Photo Film Company, Limited
 patents

Years Active: 1982-1996

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8 patents (USPTO):Explore Patents
1. 5589312 - Liquid developer for electrostatic photography (1996-12-31),
2. 5532099 - Liquid developer for electrostatic photography (1996-07-02),
3. 5356748 - Liquid developer for electrostatic photography (1994-10-18),
4. 4752548 - Light-sensitive bisazulenium salt compound compositions and (1988-06-21),
5. 4594304 - Electrophotographic light-sensitive hydrazone material (1986-06-10),
6. 4473630 - Liquid developer comprising aminoalkyl styrene polymer for electrostatic (1984-09-25),
7. 4405704 - Triphenylmethane polymer, process for production thereof, and (1983-09-20),
8. 4360660 - Triphenylmethane polymer, process for production thereof, and (1982-11-23),

Title: Shu Watarai: Innovator in Electrostatic Photography

Introduction

Shu Watarai is a prominent inventor based in Kanagawa, Japan. He has made significant contributions to the field of electrostatic photography, holding a total of 8 patents. His innovative work has advanced the technology used in liquid developers, enhancing the quality and efficiency of electrostatic imaging.

Latest Patents

Watarai's latest patents include a liquid developer for electrostatic photography that comprises resin grains dispersed in a non-aqueous solvent. This developer has a volume specific resistivity of at least 109 Ω.cm. The resin grains are created by polymerizing specific monomers, resulting in a product that exhibits excellent dispersion stability. This innovation allows for the formation of toner images with high resistivity to etching solutions, which is crucial for quality in electrostatic photography.

Another notable patent involves a similar liquid developer, which also consists of resin grains dispersed in a non-aqueous solvent. This formulation includes monomers that are soluble in the solvent but become insoluble upon polymerization. The presence of a dispersion stabilizing resin enhances the overall performance of the developer, making it a valuable asset in the field.

Career Highlights

Watarai has spent a significant part of his career at Fuji Photo Film Company, Limited. His work has not only contributed to the company's advancements but has also positioned him as a key figure in the development of electrostatic photography technologies.

Collaborations

Throughout his career, Watarai has collaborated with notable colleagues such as Seiji Horie and Nobuo Suzuki. These partnerships have fostered innovation and have been instrumental in the development of his patented technologies.

Conclusion

Shu Watarai's contributions to the field of electrostatic photography through his patents and collaborations highlight his role as an influential inventor. His work continues to impact the industry, paving the way for future advancements in imaging technology.

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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