Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D360224 | Housing for an electronic instructional game apparatus | Frederick L. T. Tsang, Chung P. C. Lau | 1995-07-11 |
| D358421 | Electronic educational activity toy | Frederick L. T. Tsang | 1995-05-16 |
| D353566 | Walker | Frederick L. T. Tsang | 1994-12-20 |
| 5362272 | Activity toy and walker device | Frederick L. T. Tsang | 1994-11-08 |
| D350373 | Housing for an electronic instructional game apparatus | Frederick L. T. Tsang, Chung P. C. Lau | 1994-09-06 |
| D348483 | Housing for an electronic instructional game apparatus | Chung P. C. Lau | 1994-07-05 |