| # | Country | Total Patents | |
|---|---|---|---|
| #1 | China | 15 |
| # | Industry | |
|---|---|---|
| #1 | Consumer goods | |
| #2 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Filing and indexing | |
| #2 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Zhenyuan Du | 5 |
| #2 | Du Zhenyuan | 5 |
| #3 | Zhonyuan Du | 1 |
| #4 | An Du Zhen | 1 |
| #5 | Hongru Zheng | 1 |
| #6 | Zheng Hongru | 1 |
| #7 | Junichi Kumagai | 1 |
| #8 | Monichi Kumagai | 1 |
| #9 | Du Zhen An | 1 |
| Publication | Filing date | Title |
|---|---|---|
| CN1526571A | Ring spring binder capable of transmitting signal | |
| CN1350933A | Snap ring type binder with cover plate | |
| CN1374201A | Casing for ring folder mechanism |