North American Philips Corporation
955Patents
0Active
955Granted
45Portfolio score
Filing activity: Mar 18, 1974 → Nov 20, 1996
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4652820A | Combined position sensor and magnetic motor or bearing | Mechanical Engineering; Lighting; Heating | 1,183 | Expired |
| US5223924A | System and method for automatically correlating user preferences with a T.V. program information database | Electricity | 883 | Expired |
| US5047867A | Interface for a TV-VCR system | Electricity | 679 | Expired |
| US5404082A | High frequency inverter with power-line-controlled frequency modulation | Emerging Cross-Sectional Technologies | 593 | Expired |
| US5233423A | Embedded commericals within a television receiver using an integrated electronic billboard | Electricity | 382 | Expired |
| US5633951A | Registration of volumetric images which are relatively elastically deformed by matching surfaces | Electricity | 249 | Expired |
| US5291289A | Method and apparatus for transmission and reception of a digital television signal using multicarrier modulation | Electricity | 217 | Expired |
| US5432561A | System for automatically activating picture-in-picture when an auxiliary signal is detected | Electricity | 205 | Expired |
| US5166956A | Data transmission system and apparatus providing multi-level differential signal transmission | Electricity | 196 | Expired |
| US4071430A | Electrophoretic image display having an improved switching time | Physics | 179 | Expired |
| US5134464A | Method and apparatus for the transmission and reception of a multicarrier digital television signal | Electricity | 173 | Expired |
| US4300150A | Lateral double-diffused MOS transistor device | Emerging Cross-Sectional Technologies | 172 | Expired |
| US4522472A | Electrophoretic image display with reduced drives and leads | Physics | 169 | Expired |
| US4900136A | Method of metallizing silica-containing gel and solid state light modulator incorporating the metallized gel | Chemistry; Metallurgy | 155 | Expired |
| US4203106A | X-Y addressable electrophoretic display device with control electrode | Physics | 146 | Expired |
| US5128758A | Method and apparatus for digitally processing a high definition television augmentation signal | Electricity | 138 | Expired |
| US4864390A | Display system with equal path lengths | Physics | 134 | Expired |
| US4365130A | Vented membrane switch with contaminant scavenger | Electricity | 132 | Expired |
| US5410370A | Single panel color projection video display improved scanning | Physics | 132 | Expired |
| US5416514A | Single panel color projection video display having control circuitry for synchronizing the color illumination system with reading/writing of the light valve | Physics | 128 | Expired |
| US4959719A | Picture-in-picture television receiver control | Electricity | 127 | Expired |
| US4639761A | Combined bipolar-field effect transistor resurf devices | Emerging Cross-Sectional Technologies | 127 | Expired |
| US5368033A | Magnetic resonance angiography method and apparatus employing an integration projection | Physics | 121 | Expired |
| US4952849A | Fluorescent lamp controllers | Emerging Cross-Sectional Technologies | 117 | Expired |
| US4700113A | Variable high frequency ballast circuit | Emerging Cross-Sectional Technologies | 116 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.