| # | Country | Total Patents | |
|---|---|---|---|
| #1 | China | 3 | |
| #2 | Germany | 3 | |
| #3 | Japan | 3 | |
| #4 | Taiwan | 3 | |
| #5 | United States | 3 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machines | |
| #3 | Consumer goods | |
| #4 | Audio-visual technology | |
| #5 | Control |
| # | Technology | |
|---|---|---|
| #1 | Unspecified technologies | |
| #2 | Safes | |
| #3 | Locks | |
| #4 | Buttons, pins and buckles | |
| #5 | Advertising | |
| #6 | Hand carried bags | |
| #7 | Registering cash receipt | |
| #8 | Bolts for doors or windows |
| # | Name | Total Patents |
|---|---|---|
| #1 | Chang Wei-Yu | 9 |
| #2 | Chang Wei-Chih | 8 |
| #3 | Wei Chi Chang | 3 |
| #4 | Wei-Yi Chang | 3 |
| #5 | Wei-Yu Chang | 2 |
| #6 | Wei-Chih Chang | 2 |
| #7 | Chang Wei Yu | 1 |
| Publication | Filing date | Title |
|---|---|---|
| TW201209265A | Electronic key box | |
| TW201211371A | Electronic cash box | |
| TW201208599A | Key tag | |
| US2006054678A1 | Cash register money tray bill weight structure | |
| US6581422B1 | Locking device for portable safe |