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For the Inventor, By the Inventor

Mito, Japan

Sadao Minakawa

This inventor holds 7 USPTO granted patents. Top assignees: Hitachi, Ltd., Hitachi Instrument Engineering Co., Ltd.. Active years: 1989-1994.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Sadao Minakawa. Retrieved from https://idiyas.com/inventor/sadao-minakawa

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

USPTO Granted Patents = 7

% Patents Active = 100.0

Average Co-Inventor Count = 2.8

ph-index = 3

Forward Citations = 52(Granted Patents)


Company Filing History:

goldMedal7 out of 42,726 
 
Hitachi, Ltd.
 patents
silverMedal1 out of 18 
 
Hitachi Instrument Engineering Co., Ltd.
 patents
where one patent can have more than one assignee

Years Active: 1989-1994

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7 patents (USPTO):Explore Patents
1. 5276499 - Spectrophotometer (1994-01-04),
2. D325176 - Spectro photometer (1992-04-07),
3. D323437 - Control table for spectro photometer (1992-01-28),
4. 5041727 - Spectrophotometer with near infrared radiation sensor having an improved (1991-08-20),
5. 4981357 - Spectrophotometer having functions of both a double-monochromater and a (1991-01-01),
6. 4810872 - Optical property measuring device (1989-03-07),
7. 4810089 - Photoelastic effect measuring device (1989-03-07),

Title: Sadao Minakawa: Innovator in Spectrophotometry

Introduction

Sadao Minakawa is a notable inventor based in Mito, Japan. He has made significant contributions to the field of spectrophotometry, holding a total of 7 patents. His work focuses on enhancing the capabilities of spectrophotometers, which are essential tools in various scientific applications.

Latest Patents

One of his latest inventions is a sophisticated spectrophotometer designed to extract monochromatic lights from various light sources. This device utilizes spectroscopes to transmit these lights through a sample and detects the transmitted lights using sensors. The innovation includes multiple dispersing elements within the spectroscope, each tailored for different wavelength ranges. Additionally, it features a mechanism for correcting discrepancies in measured values when different dispersing elements or sensors are employed, ensuring accuracy across overlapping wavelength regions.

Career Highlights

Throughout his career, Sadao Minakawa has worked with prominent companies such as Hitachi, Ltd. and Hitachi Instrument Engineering Co., Ltd. His experience in these organizations has allowed him to refine his expertise in optical technologies and instrumentation.

Collaborations

He has collaborated with talented individuals in his field, including Kazunori Hashimoto and Kazuki Torai. These partnerships have contributed to the advancement of his innovative projects and patents.

Conclusion

Sadao Minakawa's contributions to spectrophotometry exemplify his dedication to innovation and excellence in scientific instrumentation. His patents reflect a commitment to improving measurement techniques, which have broad applications in research and industry.

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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