Location History:
- Yokohama, JP (1990)
- Odawara, JP (1994)
- Niigata, JP (1996 - 1997)
Company Filing History:
3 out of 499 
2 out of 25,560 
1 out of 1 Years Active: 1990-1997
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.