Forward Citations = 63

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2 inventors (with patents filed for the assignee):

Hak Soo Chang (2 out of 4 patents)

Chang Hak Soo (2 out of 2 patents)

4 patents: Sort by Forward Citations

1. 5842374 - Measuring method of a wide range level and an apparatus thereof (1998-12-01),

2. 5791187 - Level measurement method using measurements of water column pressure (1998-08-11),

3. 5780747 - Open channel multichannel ultrasonic flowrate measurement apparatus and (1998-07-14),

4. 5734111 - Apparatus for measuring the flow quantity of rivers and method thereof (1998-03-31),

Company Overview

Changmin Co., Ltd. is a leading manufacturer of electronic components, specializing in the production of high-quality capacitors and resistors. With over 20 years of experience in the industry, we are committed to providing our customers with innovative and reliable solutions for their electronic needs. Our state-of-the-art facilities and strict quality control measures ensure that our products meet the highest standards of performance and durability. Contact us today to learn more about how Changmin Co., Ltd. can help meet your electronic component needs.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 20 2026

4 Patents

#768 in Seoul

#2,202 in South Korea

Seoul, South Korea

Changmin Co., Ltd.

Forward Citations = 63

2 inventors:

Hak Soo Chang (2 out of 4 patents)

Chang Hak Soo (2 out of 2 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Changmin Co., Ltd.. Retrieved from https://idiyas.com/company/changmin-company

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

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]