logo

For the Inventor, By the Inventor

Hamamatsu, Japan

Kunimasa Muroi

This inventor holds 18 USPTO granted patents and 1 published patent application, primarily in Electrostatic Loudspeakers. Top assignees: Yamaha Corporation, Nippon Gakki Seizo Kabushiki Kaisha. Active years: 1979-2015.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Kunimasa Muroi. Retrieved from https://idiyas.com/inventor/kunimasa-muroi

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

Calculating rank
USPTO Granted Patents = 18 

% Patents Active = 72.2

Average Co-Inventor Count = 2.5

ph-index = 6

Forward Citations = 150(Granted Patents)


Location History:

  • Shizuoka, JP (1996 - 1997)
  • Shizuoka-ken, JP (2004)
  • Hamamatsu, JP (1979 - 2015)

Company Filing History:

goldMedal15 out of 5,505 
 
Yamaha Corporation
 patents
silverMedal3 out of 841 
 
Nippon Gakki Seizo Kabushiki Kaisha
 patents

Years Active: 1979-2015

Loading Chart...
Areas of Expertise:
Electrostatic Loudspeaker
Waste Liquid Processing
Photocatalytic Material
Effluent Treatment
Electro-Coagulation Printing
Printing Apparatus
Fiber Reinforced Thermoplastic
Racket Frame
Cleaning Device
Solvent Separator
Toxic Organic Matter
18 patents (USPTO):Explore Patents
1. 8983099 - Electrostatic loudspeaker (2015-03-17),
2. 7252760 - Waste liquid processing method and waste liquid processing apparatus using the same (2007-08-07),
3. 6989343 - Granular photocatalytic material, functional restoration method therefor, and apparatus for decomposing and removing toxic organic matter using the same (2006-01-24),
4. 6914031 - Photocatalyst granules (2005-07-05),
5. 6814875 - Method and device for treating waste liquid, solvent separator, and cleaning device using thereof (2004-11-09),
6. 6471874 - Effluent treating method, an effluent treating apparatus, and a cleaning apparatus using the same (2002-10-29),
7. 6428671 - Method and apparatus for electro-coagulation printing and electrode control unit (2002-08-06),
8. 6386683 - Printing apparatus and printing method therefor (2002-05-14),
9. 6348938 - Electro-coagulation printer (2002-02-19),
10. 6114000 - Material for FRTP molded objects and FRTP tubular molded object (2000-09-05),
11. 5639552 - Stong flexible pre-impregnation of fiber reinforced thermoplastic resin (1997-06-17),
12. 5633074 - Prepreg available for fiber reinforced thermoplastic resin and process (1997-05-27),
13. 5618598 - Strong flexible pre-inpregnation of fiber reinforced thermoplastic resin (1997-04-08),
14. 5520995 - Strong flexible pre-impregnation of fiber reinforced thermoplastic resin (1996-05-28),
15. 4858928 - Racket frame (1989-08-22),

Title: The Innovations of Kunimasa Muroi

Introduction

Kunimasa Muroi is a notable inventor based in Hamamatsu, Japan. He has made significant contributions to the field of electroacoustics and waste liquid processing. With a total of 18 patents to his name, Muroi's work reflects a commitment to innovation and environmental sustainability.

Latest Patents

One of Muroi's latest inventions is an electrostatic loudspeaker. This device features a first electrode with acoustic transmission properties and a second electrode that is oppositely positioned. A vibrating member, which has conductibility, is placed between these electrodes. Additionally, the design includes two elastic members that provide insulation and acoustic transmission properties. Another significant patent is a waste liquid processing method and apparatus. This method involves a series of processes, including solvent separation, vaporization, and photo-oxidative decomposition, aimed at effectively treating chlorine-based organic solvents in waste liquids.

Career Highlights

Throughout his career, Muroi has worked with prominent companies such as Yamaha Corporation and Nippon Gakki Seizo Kabushiki Kaisha. His experience in these organizations has allowed him to develop and refine his innovative ideas, contributing to advancements in technology and environmental practices.

Collaborations

Muroi has collaborated with notable individuals in his field, including Yoichi Nagasaki and Toshiharu Fukushima. These partnerships have fostered a creative environment that has led to the development of groundbreaking technologies.

Conclusion

Kunimasa Muroi's contributions to innovation, particularly in electroacoustics and waste processing, highlight his role as a leading inventor. His patents reflect a dedication to improving technology and addressing environmental challenges.

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]
Loading…