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For the Inventor, By the Inventor

Tokyo, Japan

Masahide Yamashita

This inventor holds 68 USPTO granted patents and 5 published patent applications and 4 EPO patents, primarily in Image Forming Technology (CPC class G03G). Top assignee: Ricoh Company, Ltd.. Active years: 1993-2020.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Masahide Yamashita. Retrieved from https://idiyas.com/inventor/masahide-yamashita

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

USPTO Granted Patents = 68 

% Patents Active = 50.0

 

Average Co-Inventor Count = 4.3

ph-index = 14

Forward Citations = 683(Granted Patents)

Forward Citations (Not Self Cited) = 592(Dec 10, 2025)


Inventors with similar research interests:


Location History:

  • Shizuoka-ken, JP (2002)
  • Shizuoka, JP (2001 - 2006)
  • Shizouka, JP (2007)
  • Numazu, JP (1993 - 2008)
  • Tokyo-to, JP (2011)
  • Ohta-ku, JP (2011)
  • Ota-ku, JP (2012)
  • Tokyo, JP (2007 - 2020)

Company Filing History:

goldMedal68 out of 28,951 
 
Ricoh Company, Ltd.
 patents

Years Active: 1993-2020

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Areas of Expertise:
Image Forming Apparatus
Predictive Failure
Protective Agent
Process Cartridge
Image Carrier
Management System
Deterioration Evaluation
Failure Diagnosis
Lubricant Coater
Condition Determining System
Residual Voltage Reduction
Image Abnormality
68 patents (USPTO):Explore Patents
1. 10599064 - Powder-amount detection device and image forming apparatus incorporating same (2020-03-24),
2. 10429770 - Powder-amount detection device and image forming apparatus incorporating same (2019-10-01),
3. 9201334 - Residual voltage reducing processing cartridge, image forming apparatus with same, and image forming method (2015-12-01),
4. 8768186 - Apparatus, system, and method of predicting failure of image forming apparatus (2014-07-01),
5. 8531696 - Management apparatus, management system, and management method (2013-09-10),
6. 8478561 - Rotation measuring mechanism, sheet conveyance apparatus, original reading apparatus, and image forming apparatus (2013-07-02),
7. 8472818 - Image carrier deterioration degree evaluating device, image carrier failure predicting device, and image forming apparatus (2013-06-25),
8. 8385756 - Failure diagnosis device, failure diagnosis method, image forming device, and recording medium (2013-02-26),
9. 8358941 - Management device of an image forming apparatus (2013-01-22),
10. 8339637 - Management apparatus, management system, operation status determination method, and image forming apparatus (2012-12-25),
11. 8294918 - Apparatus and method for generating a simulated image including an identified image abnormality (2012-10-23),
12. 8285188 - Protective agent for image bearing member, protective layer setting unit, and process cartridge (2012-10-09),
13. 8208835 - Protective layer forming device, image forming apparatus, and process cartridge (2012-06-26),
14. 8200101 - Condition determining system, method of detecting abnormality of condition determining system, and image forming apparatus (2012-06-12),
15. 8190037 - Fault prediction method, fault prediction system, and image forming apparatus (2012-05-29),

Title: Masahide Yamashita: A Pioneer in Powder-Amount Detection Technologies

Introduction

Masahide Yamashita is a distinguished inventor based in Tokyo, Japan, renowned for his expertise in developing innovative technologies in the field of powder-amount detection. With an impressive portfolio of 68 patents, Yamashita has made significant contributions to the engineering and manufacturing industries.

Latest Patents

Yamashita's latest inventions include cutting-edge devices designed to enhance the accuracy and efficiency of powder detection. One notable patent is the "Powder-amount detection device and image forming apparatus incorporating same." This device features a first electrode, a second electrode, a third electrode, and a voltage detector. The second electrode, positioned adjacent to the first electrode, has a smaller surface area, facilitating precise measurements of powder amounts within the container. The voltage detector meticulously monitors the charging and discharging behaviors of the electrodes to determine the powder quantity.

Another groundbreaking patent involves an advanced "Powder-amount detection device," which incorporates an outer electrode, an inner electrode, and a detector. The outer electrode is replaceably installed outside the powder container of an image forming apparatus, while the inner electrode is placed within the powder supply port. This setup enables the detector to apply an electric field between the electrodes, allowing it to assess the capacitance and accurately gauge the powder levels.

Career Highlights

Throughout his career, Masahide Yamashita has been associated with Ricoh Company, Ltd., a global leader in imaging and electronics. His work has supported the company's dedication to innovation and advancements in imaging technology. Yamashita's patents reflect his commitment to improving the efficiency and performance of imaging systems across various applications.

Collaborations

Yamashita has collaborated with talented engineers and inventors, including Yasushi Nakazato and Jun Yamane. Together, they have pushed the boundaries of technology, contributing to a deeper understanding of powder detection and its applications in sophisticated systems.

Conclusion

Masahide Yamashita's contributions to the field of powder-amount detection are substantial and transformative. His innovative patents are a testament to his ingenuity and commitment to advancing technology, making a significant impact in industries reliant on precise powder measurements. As he continues to develop new technologies and collaborate with fellow innovators, Yamashita remains a key figure in the evolution of imaging and detection systems.

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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