% Expired Patents = 100.0

Forward Citations = 2

Loading Chart...

8 inventors (with patents filed for the assignee):

BooSeok Hwang (7 out of 5 patents)

KwangSeon Hwang (4 out of 2 patents)

Yoshikazu Ishii (1 out of 17 patents)

4. Hidetoshi Yasutake (1 out of 3 patents)

5. Satoru Tomaru (1 out of 18 patents)

6. Nanayuki Takeuchi (1 out of 3 patents)

7. Kenzaburou Iijima (1 out of 26 patents)

8. Toshiharu Hoshi (1 out of 33 patents)

4 patents: Sort by Forward Citations

1. 8784084 - Rotary cam ring fluid machine (2014-07-22),

2. 8585383 - Scroll fluid machine (2013-11-19),

3. 8371834 - Anti-self rotation mechanism of a scroll fluid machine (2013-02-12),

4. 6942399 - Optical fiber coupler reinforcing member and optical fiber coupler (2005-09-13),

Company Overview

Richstone Limited is a leading provider of luxury real estate and property management services. With a strong reputation for excellence and professionalism, Richstone Limited offers a wide range of exclusive properties for sale and rental in prime locations. With a team of experienced professionals, Richstone Limited strives to deliver exceptional service and value to its clients.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 13 2026

4 Patents

#4 in Jeonju

#2,200 in South Korea

Jeonju, South Korea

Richstone Limited

Forward Citations = 2

8 inventors:

BooSeok Hwang (7 out of 5 patents)

KwangSeon Hwang (4 out of 2 patents)

Yoshikazu Ishii (1 out of 17 patents)

4. Hidetoshi Yasutake (1 out of 3 patents)

5. Satoru Tomaru (1 out of 18 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Richstone Limited. Retrieved from https://idiyas.com/company/richstone

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]