David Campbell
8Patents
3h-index
5Co-inventors
50Inventor score
Filing activity: May 2, 1975 → Dec 13, 2017
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6487284B1 | Card pay telephone with speed dialing | Electricity | 32 | Expired |
| US4177650A | Cryogenic cooling apparatus | Mechanical Engineering; Lighting; Heating | 9 | Expired |
| US6490458B1 | Portable phone bank | Electricity | 4 | Expired |
| US4570457A | Cryogenic cooling apparatus | Mechanical Engineering; Lighting; Heating | 3 | Expired |
| US3990265A | Joule-Thomson liquifier utilizing the Leidenfrost principle | Mechanical Engineering; Lighting; Heating | 1 | Expired |
| US9881000B1 | Avoiding sentiment model overfitting in a machine language model | Physics | 1 | Active |
| US4373357A | Cryogenic cooling apparatus | Mechanical Engineering; Lighting; Heating | 1 | Expired |
| US10496751B2 | Avoiding sentiment model overfitting in a machine language model | Physics | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.