David Cheung
21Patents
10h-index
8Co-inventors
68Inventor score
Filing activity: Oct 14, 1987 → Aug 15, 2013
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4968255A | Electronic instructional apparatus | Physics | 166 | Expired |
| USD318880S | Electronic educational game for teaching children colors, numbers, nursery rhymes and the like | General | 20 | Expired |
| US5730325A | Toy water gun | Mechanical Engineering; Lighting; Heating | 20 | Expired |
| USD318306S | Electronic toy | General | 20 | Expired |
| US8068725B2 | Fragrance emitting apparatus for use with USB port | Human Necessities | 15 | Active |
| US8032014B2 | Fragrance emitting apparatus for use with USB port | Electricity | 15 | Active |
| USD318069S | Electronic educational game for introducing children to basic math functions | General | 15 | Expired |
| USD330048S | Electronic educational game housing | General | 14 | Expired |
| USD308510S | Electronic educational game housing | General | 13 | Expired |
| USD321384S | Electronic driving toy | General | 11 | Expired |
| USD308991S | Electronic educational game housing | General | 10 | Expired |
| USD534292S1 | Spot light | General | 10 | Expired |
| USD309923S | Electronic educational game housing | General | 9 | Expired |
| US7778531B2 | Disposable air freshener configured for connection to USB port | Human Necessities | 8 | Active |
| US8625977B2 | Fragrance emitting apparatus for use with USB port | Human Necessities | 7 | Active |
| USD330703S | Electronic computer housing | General | 6 | Expired |
| USD311523S | Housing for an electronic educational video system | General | 4 | Expired |
| USD317176S | Electronic learning aid | General | 4 | Expired |
| USD318491S | Combined keyboard and electronic learning aid | General | 0 | Expired |
| USD698913S1 | Fragrance emitting device for use with a smart phone | General | 0 | Active |
| USD699829S1 | Fragrance emitting device for use with a smart phone | General | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.