Tadashi Umehara

This inventor holds 4 USPTO granted patents. Top assignees: Mitsubishi Kasei Corporation, Sharp Kabushiki Kaisha Corporation. Active years: 1990-1997.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Tadashi Umehara. Retrieved from https://idiyas.com/inventor/tadashi-umehara

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

USPTO Granted Patents = 4

% Patents Active = 100.0

Average Co-Inventor Count = 5.3

ph-index = 3

Forward Citations = 18(Granted Patents)

Location History:

Yokohama, JP (1990)
Odawara, JP (1994)
Niigata, JP (1996 - 1997)

Company Filing History:

4 out of 499

Mitsubishi Kasei Corporation

patents

2 out of 25,954

Sharp Kabushiki Kaisha Corporation

patents

where one patent can have more than one assignee

Years Active: 1990-1997

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4 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 5665502 - Electrophotographic photoreceptor and method for producing the (1997-09-09),

2. 5536607 - Image correcting method using an electrophotographic photoreceptor (1996-07-16),

3. 5292607 - Electrophotographic photoreceptor containing polycarbonate resin as a (1994-03-08),

4. 4972569 - Method for rotatingly transferring hollow cylindrical articles (1990-11-27),

Title: The Innovations of Tadashi Umehara

Introduction

Tadashi Umehara is a notable inventor based in Niigata, Japan. He has made significant contributions to the field of electrophotography, holding a total of 4 patents. His work has advanced the technology used in photoreceptors, which are essential components in imaging systems.

Latest Patents

Umehara's latest patents include an electrophotographic photoreceptor and a method for producing it. This invention features a cylindrical electrically conductive substrate with a photoconductive layer. The conductive substrate has a marking portion where the light reflectance of the surface has been altered through laser light treatment. Additionally, he has developed an image correcting method that utilizes this photoreceptor, enhancing the quality and accuracy of images produced.

Career Highlights

Throughout his career, Umehara has worked with prominent companies such as Mitsubishi Kasei Corporation and Sharp Corporation. His experience in these organizations has allowed him to refine his skills and contribute to innovative projects in the field of electrophotography.

Collaborations

Umehara has collaborated with notable coworkers, including Mamoru Nozomi and Kunio Ohashi. Their combined expertise has likely fostered a creative environment that encourages innovation and the development of new technologies.

Conclusion

Tadashi Umehara's contributions to the field of electrophotography through his patents and collaborations highlight his role as a significant inventor. His work continues to influence advancements in imaging technology, showcasing the importance of innovation in this area.

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]