Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8176761 | Keypad lockset | Ping Hsien Tsai, Wai P. Wong, John E. Walsh, Louls Romo Martinez | 2012-05-15 |
| 8141400 | Keypad lockset | Ping Hsien Tsai, Wai P. Wong, John E. Walsh, Louis Romo Martinez | 2012-03-27 |
| 5467855 | Ramp weight-reducing assembly | — | 1995-11-21 |
| 5267457 | Double latch dead bolt lock operating mechanism | Kent Martins | 1993-12-07 |
| 4845808 | Ramp handle | Thomas H. Millar | 1989-07-11 |