% Expired Patents = 11.1

Forward Citations = 237

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3 inventors (with patents filed for the assignee):

Hozo Yoshino (9 out of 9 patents)

Mitsuo Koshi (1 out of 2 patents)

Osamu Sumiyoshi (1 out of 1 patent)

9 patents: Sort by Forward Citations

1. 11496082 - Synchronous motor drive system and synchronous motor drive method (2022-11-08),

2. 11056995 - Synchronous motor drive system and synchronous motor drive method (2021-07-06),

3. 7456600 - Pulse code width modulation motor drive system (2008-11-25),

4. 5420778 - Independent real time control of output frequency and voltage of PWM (1995-05-30),

5. 4634952 - Inverter (1987-01-06),

6. 4593881 - Electronic expansion valve (1986-06-10),

7. 4507936 - Integral solar and heat pump water heating system (1985-04-02),

8. 4481788 - Water heating system (1984-11-13),

9. 4420947 - Heat pump air conditioning system (1983-12-20),

Company Overview

System Homes Company, Ltd. is a leading provider of innovative and sustainable modular homes. With a focus on quality craftsmanship and cutting-edge design, we strive to revolutionize the home building industry. Our team of experienced professionals is dedicated to delivering high-quality, energy-efficient homes that exceed our clients' expectations. From custom designs to turnkey solutions, System Homes Company, Ltd. is committed to building homes that are both beautiful and environmentally friendly.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 13 2026

9 Patents

#2,020 in Tokyo

#4,699 in Japan

Tokyo, Japan

System Homes Company, Ltd.

Forward Citations = 237

3 inventors:

Hozo Yoshino (9 out of 9 patents)

Mitsuo Koshi (1 out of 2 patents)

Osamu Sumiyoshi (1 out of 1 patent)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: System Homes Company, Ltd.. Retrieved from https://idiyas.com/company/system-homes-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]