North American Philips Lighting Corp.
25Patents
0Active
25Granted
31Portfolio score
Filing activity: Aug 21, 1981 → Jul 24, 1989
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4503360A | Compact fluorescent lamp unit having segregated air-cooling means | Emerging Cross-Sectional Technologies | 107 | Expired |
| US4463286A | Lightweight electronic ballast for fluorescent lamps | Emerging Cross-Sectional Technologies | 55 | Expired |
| US4602956A | Cermet composites, process for producing them and arc tube incorporating them | Emerging Cross-Sectional Technologies | 48 | Expired |
| US4475065A | Method of operating HID sodium lamp to minimize lamp voltage variation throughout lamp life | Electricity | 23 | Expired |
| US4506195A | Apparatus for operating HID lamp at high frequency with high power factor and for providing standby lighting | Electricity | 21 | Expired |
| US4631450A | Ballast adaptor for improving operation of fluorescent lamps | Electricity | 21 | Expired |
| US4463277A | Compact halogen-cycle incandescent lamp, and lamp unit utilizing such lamp as a light source | Emerging Cross-Sectional Technologies | 18 | Expired |
| US4525650A | Starting and operating method and apparatus for discharge lamps | Emerging Cross-Sectional Technologies | 16 | Expired |
| US4500810A | Fluorescent lamp having integral light-filtering means and starting aid | Electricity | 13 | Expired |
| US4491766A | High pressure electric discharge lamp employing a metal spiral with positive potential | Electricity | 11 | Expired |
| USD302473S | Compact fluorescent lamp | General | 10 | Expired |
| US4479074A | High intensity vapor discharge lamp with sintering aids for electrode emission materials | Electricity | 8 | Expired |
| USD302471S | Compact fluorescent lamp | General | 7 | Expired |
| US4501992A | Energy conserving instant-start series-sequence fluorescent lamp system and fluorescent lamp with overcurrent protection | Electricity | 6 | Expired |
| US4701673A | Ballast adaptor for improving operation of fluorescent lamps | Electricity | 5 | Expired |
| US4538091A | High-pressure sodium lamp spring clip cross piece for electrode and end plug support | Electricity | 4 | Expired |
| US4748368A | Three way gas discharge lamp | Electricity | 4 | Expired |
| US4516446A | Precision rotating rod guide | Emerging Cross-Sectional Technologies | 3 | Expired |
| US4629939A | Discharge lamp with automatic shut off | Electricity | 2 | Expired |
| US4787865A | Three-way lamp bases and method for making them | Electricity | 2 | Expired |
| US4708679A | Method of making support means for discharge lamp tubes | Electricity | 2 | Expired |
| US4781641A | Tool for making three-way lamp bases | Electricity | 1 | Expired |
| US4774431A | Arc tube wire support | Electricity | 1 | Expired |
| USD302472S | Compact fluorescent reflector lamp | General | 0 | Expired |
| US4973878A | Filament structure and method of making such structure | Electricity | 0 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.