John Y. Ma
30Patents
14h-index
16Co-inventors
78Inventor score
Filing activity: Apr 1, 1974 → Jun 20, 2000
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6501554B1 | 3D scanner and method for measuring heights and angles of manufactured parts | Physics | 242 | Expired |
| US4746879A | Digitally temperature compensated voltage-controlled oscillator | Electricity | 195 | Expired |
| US5003622A | Printed circuit transformer | Electricity | 56 | Expired |
| US5912595A | Digitally temperature compensated voltage-controlled oscillator tunable to different frequency channels | Electricity | 56 | Expired |
| US4805232A | Ferrite-core antenna | Electricity | 50 | Expired |
| US4352209A | Up-down frequency converter for cable T.V. | Electricity | 43 | Expired |
| US5060297A | TVRO receiver system with tracking filter for rejection of image frequencies | Electricity | 42 | Expired |
| US4761825A | TVRO earth station receiver for reducing interference and improving picture quality | Electricity | 42 | Expired |
| US4792993A | TVRD receiver system with automatic bandwidth adjustment | Electricity | 38 | Expired |
| US4801940A | Satellite seeking system for earth-station antennas for TVRO systems | Electricity | 30 | Expired |
| US4816769A | BPSK demodulator and FM receiver for digital data pagers | Electricity | 30 | Expired |
| US6509559B1 | Binary optical grating and method for generating a moire pattern for 3D imaging | Physics | 30 | Expired |
| US4002986A | Television receiver with tuner capable of receiving air and CATV signals | Electricity | 16 | Expired |
| US4785302A | Automatic polarization control system for TVRO receivers | Electricity | 15 | Expired |
| US4876739A | TVRO receiver system with low-cost video-noise reduction filter | Electricity | 14 | Expired |
| US4684858A | Motor pulse extraction system | Emerging Cross-Sectional Technologies | 12 | Expired |
| US3980968A | Non-proportionate AFC system | Electricity | 9 | Expired |
| US4783848A | TVRO receiver system for locating audio subcarriers | Electricity | 9 | Expired |
| US3962643A | Abrupt junction varactor diode television tuner | Electricity | 9 | Expired |
| US3931579A | Digital signal seeking tuning system | Electricity | 9 | Expired |
| US4619000A | CATV converter having improved tuning circuits | Electricity | 8 | Expired |
| US5159711A | Interference filter with high degree of selectivity for TVRO receiver system | Electricity | 8 | Expired |
| US4709409A | TVRO receiver with surface mounted high frequency voltage-controlled oscillator | Electricity | 8 | Expired |
| US4626862A | Antenna having coaxial driven element with grounded center conductor | Electricity | 7 | Expired |
| US3965427A | Television tuning system with precision substrate switch assembly | Electricity | 6 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.