Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5219385 | Lock for fire-escape door | — | 1993-06-15 |
| 4813250 | Lock device with concealed mounting screws | — | 1989-03-21 |
| 4682484 | Tumbler plate cylinder lock | — | 1987-07-28 |
| 4341102 | Construction for a cylinder lock and key | Chung-Chiang Ku | 1982-07-27 |