William M. Keeffe
40Patents
11h-index
28Co-inventors
71Inventor score
Filing activity: Nov 22, 1974 → May 7, 1991
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4499396A | Metal halide arc discharge lamp with means for suppressing convection currents within the outer envelope and methods of operating same | Electricity | 32 | Expired |
| US5057743A | Metal halide discharge lamp with improved color rendering properties | Electricity | 28 | Expired |
| US4818915A | Arc discharge lamp with ultraviolet radiation starting source | Electricity | 27 | Expired |
| US4709184A | Low wattage metal halide lamp | Electricity | 27 | Expired |
| US4888517A | Double-enveloped lamp having a shield surrounding a light-source capsule within a thick-walled outer envelope | Electricity | 21 | Expired |
| US4672267A | High intensity discharge device containing oxytrihalides | Electricity | 18 | Expired |
| US4721876A | Light-source capsule containment device and lamp employing such device | Electricity | 18 | Expired |
| US4320322A | Electrode geometry to improve arc stability | Electricity | 15 | Expired |
| US4321504A | Low wattage metal halide arc discharge lamp | Electricity | 14 | Expired |
| US4812714A | Arc discharge lamp with electrodeless ultraviolet radiation starting source | Electricity | 13 | Expired |
| US4056751A | Metal halide discharge lamp having optimum electrode location | Electricity | 12 | Expired |
| US4859899A | Metal-halide lamp having heat redistribution means | Electricity | 11 | Expired |
| US4580989A | Metal halide arc discharge lamp with means for suppressing convection currents within the outer envelope and methods of operating and constructing same | Electricity | 10 | Expired |
| US4386292A | Projection lamp comprising single ended arc discharge lamp and an interference filter | Physics | 10 | Expired |
| US4791334A | Metal-halide lamp having heat redistribution means | Electricity | 10 | Expired |
| US4308483A | High brightness, low wattage, high pressure, metal vapor discharge lamp | Electricity | 10 | Expired |
| US4302699A | Low wattage metal halide arc discharge lamp having optimum efficacy | Electricity | 9 | Expired |
| US4620125A | Low wattage metal halide lamp with inverted domed sleeve | Electricity | 8 | Expired |
| US4625141A | Low wattage metal halide discharge lamp electrically biased to reduce sodium loss | Electricity | 8 | Expired |
| US4850499A | Method to reduce color temperature variation in metal halide arc tubes | Electricity | 7 | Expired |
| US4415829A | Direct current operable arc lamp | Electricity | 7 | Expired |
| US4044276A | High pressure mercury vapor discharge lamp having improved electrodes | Electricity | 7 | Expired |
| US5159229A | Metal halide lamp having CO in gas fill | Electricity | 6 | Expired |
| US4636687A | Electrode alignment and capsule design for single-ended low wattage metal halide lamps | Electricity | 6 | Expired |
| US5021703A | Metal halide lamp | Electricity | 6 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.