Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6758070 | Door lock with a clutch having a cam-styled axle sleeve | Chao-Ming Cheng, Chen-Chien Chen | 2004-07-06 |
| 6725693 | Door lock with a clutch having a cam-styled axle sleeve | Chen-Chien Chen, Chao-Ming Cheng | 2004-04-27 |
| 4578967 | Combined door latch and deadbolt arrangement | — | 1986-04-01 |