Ian Powell
14Patents
8h-index
17Co-inventors
69Inventor score
Filing activity: Jul 7, 1978 → Jul 6, 2020
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4826299A | Linear deiverging lens | Physics | 122 | Expired |
| US5473474A | Panoramic lens | Physics | 93 | Expired |
| US5631778A | Panoramic fish-eye imaging system | Physics | 46 | Expired |
| US5161062A | Optical projection system including a refractive lens assembly having a gap between constituent lenses | Physics | 23 | Expired |
| US5629808A | D-shape laser beam projector | Physics | 19 | Expired |
| US8807751B2 | Retinal fundus surveillance method and apparatus | Human Necessities | 19 | Active |
| US8491120B2 | Retinal fundus surveillance method and apparatus | Physics | 17 | Active |
| US7039267B2 | Optical switch | Electricity | 14 | Expired |
| US5499066A | Optical instrument with a continuously adjustable zoom | Human Necessities | 8 | Expired |
| US7317535B2 | Wavelength dispersive fourier transform spectrometer | Physics | 8 | Expired |
| US6002483A | Non-contact interference optical system for measuring the length of a moving surface with a large N.A. collector optical system | Physics | 2 | Expired |
| US4222018A | Mode filters | Electricity | 1 | Expired |
| US10761321B2 | Optical arrangements including Fresnel lens elements | Physics | 0 | Active |
| US11693238B2 | Optical arrangements including Fresnel lens elements | Physics | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.