David Kappel
19Patents
13h-index
37Co-inventors
78Inventor score
Filing activity: May 11, 1993 → Feb 4, 2019
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5704700A | Laser illuminated image projection system and method of using same | Electricity | 102 | Expired |
| US6746124B2 | Flashlight producing uniform high brightness | Mechanical Engineering; Lighting; Heating | 77 | Expired |
| US6819506B1 | Optical lens system for projecting light in a lambertion pattern from a high power led light source | Mechanical Engineering; Lighting; Heating | 61 | Expired |
| US6577387B2 | Inspection of ophthalmic lenses using absorption | Physics | 56 | Expired |
| US5453803A | Low profile liquid crystal projector and method of using same | Physics | 54 | Expired |
| US6606173B2 | Illumination device and method for laser projector | Electricity | 38 | Expired |
| US5700076A | Laser illuminated image producing system and method of using same | Electricity | 35 | Expired |
| US5400095A | Display projection method and apparatus an optical input device therefor | Electricity | 33 | Expired |
| US6220713A | Projection lens and system | Physics | 23 | Expired |
| US5321450A | Low profile liquid crystal projector and method of using same | Physics | 22 | Expired |
| US6870650B2 | Illumination device and method for laser projector | Physics | 20 | Expired |
| US5510861A | Compact projector and method of using same | Electricity | 17 | Expired |
| US7554737B2 | Illumination device and method using adaptable source and output format | Physics | 17 | Active |
| US6362922B1 | Projection lens and system | Physics | 8 | Expired |
| US6052214A | System and method for producing an enhanced image | Physics | 6 | Expired |
| US6795189B2 | Universal microplate analyzer | Physics | 4 | Expired |
| US5483382A | Projection lens and method of using same | Physics | 3 | Expired |
| US6407864B1 | Automated system for testing two dimensional detector arrays and optical systems using sequential filters | Electricity | 2 | Expired |
| US11795958B2 | Method for determining operating states of a fan | Emerging Cross-Sectional Technologies | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.