Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7234265 | Internal red dot sight | Li-Der Cheng | 2007-06-26 |
| 6574320 | Coin release mechanism of payphone | Li-Der Cheng | 2003-06-03 |
| 6487292 | Telephone terminal connection cover | Li-Der Cheng | 2002-11-26 |
| 6286755 | Coin retrieval device for a pay phone | Li-Der Cheng | 2001-09-11 |
| 6193562 | Mother board connector of public telephone | Li-Der Cheng | 2001-02-27 |
| 6098875 | Structure of a coin collector cover | Li-Der Cheng | 2000-08-08 |
| 5963628 | Reinforcement pay phone upper housing | Li-Der Cheng | 1999-10-05 |
| 5848153 | Blast proof apparatus for the coin return cavity of a public phone | Li-Te Cheng, Sung-Min Lin | 1998-12-08 |