Inventor · disambiguated record
John Y. Ma
Also filed as: MA JOHN · MA JOHN Y
30 granted patents·1,412 citations·filing 1974–2000
98Inventor score
Top patents by PatentIndex Score
30 records- 0198US4746879ADigitally temperature compensated voltage-controlled oscillatorMA JOHN Y·Filed 1986·Granted May 24, 1988·250 cites·16 claims
- 0296US6501554B13D scanner and method for measuring heights and angles of manufactured partsPPT VISION INC·Filed 2000·Granted Dec 31, 2002·272 cites·27 claims
- 0392US5912595ADigitally temperature compensated voltage-controlled oscillator tunable to different frequency channelsFiled 1997·Granted Jun 15, 1999·85 cites·17 claims
- 0491US4352209AUp-down frequency converter for cable T.V.MA JOHN·Filed 1981·Granted Sep 28, 1982·68 cites·5 claims
- 0590US5003622APrinted circuit transformerASTEC INT LTD·Filed 1989·Granted Mar 26, 1991·76 cites·19 claims
- 0689US4761825ATVRO earth station receiver for reducing interference and improving picture qualityCAPETRONIC BSR LTD·Filed 1985·Granted Aug 2, 1988·66 cites·13 claims
- 0788US6509559B1Binary optical grating and method for generating a moire pattern for 3D imagingPPT VISION INC·Filed 2000·Granted Jan 21, 2003·48 cites·24 claims
- 0888US4792993ATVRD receiver system with automatic bandwidth adjustmentCAPETRONIC BSR LTD·Filed 1985·Granted Dec 20, 1988·60 cites·16 claims
- 0987US4805232AFerrite-core antennaMA JOHN Y·Filed 1987·Granted Feb 14, 1989·80 cites·20 claims
- 1085US5060297ATVRO receiver system with tracking filter for rejection of image frequenciesMA JOHN Y·Filed 1988·Granted Oct 22, 1991·74 cites·17 claims
- 1181US4002986ATelevision receiver with tuner capable of receiving air and CATV signalsZENITH RADIO CORP·Filed 1975·Granted Jan 11, 1977·26 cites·16 claims
- 1281US3980968ANon-proportionate AFC systemZENITH RADIO CORP·Filed 1975·Granted Sep 14, 1976·12 cites·7 claims
- 1379US4801940ASatellite seeking system for earth-station antennas for TVRO systemsCAPETRONIC BSR LTD·Filed 1985·Granted Jan 31, 1989·51 cites·23 claims
- 1476US4816769ABPSK demodulator and FM receiver for digital data pagersMA JOHN Y·Filed 1987·Granted Mar 28, 1989·46 cites·45 claims
- 1569US4876739ATVRO receiver system with low-cost video-noise reduction filterCAPETRONIC BSR LTD·Filed 1987·Granted Oct 24, 1989·25 cites·8 claims
- 1667US3983490ASignal overload protection circuit for varactor tunerZENITH RADIO CORP·Filed 1975·Granted Sep 28, 1976·7 cites·8 claims
- 1763US4684858AMotor pulse extraction systemCAPETRONIC BSR LTD·Filed 1985·Granted Aug 4, 1987·24 cites·22 claims
- 1863US4626862AAntenna having coaxial driven element with grounded center conductorMA JOHN·Filed 1984·Granted Dec 2, 1986·19 cites·5 claims
- 1961US3962643AAbrupt junction varactor diode television tunerZENITH RADIO CORP·Filed 1974·Granted Jun 8, 1976·11 cites·21 claims
- 2059US4718117ATVRO receiver system with low-cost video-noise reduction filterCAPETRONIC BSR LTD·Filed 1985·Granted Jan 5, 1988·13 cites·21 claims
- 2158US3931579ADigital signal seeking tuning systemZENITH RADIO CORP·Filed 1974·Granted Jan 6, 1976·10 cites·39 claims
- 2256US3965427ATelevision tuning system with precision substrate switch assemblyZENITH RADIO CORP·Filed 1974·Granted Jun 22, 1976·9 cites·17 claims
- 2353US4785302AAutomatic polarization control system for TVRO receiversCAPETRONIC BSR LTD·Filed 1985·Granted Nov 15, 1988·17 cites·14 claims
- 2453US4783848ATVRO receiver system for locating audio subcarriersCAPETRONIC BSR LTD·Filed 1985·Granted Nov 8, 1988·15 cites·7 claims
- 2553US3946319AAll electronic digital tuner system with memoryZENITH RADIO CORP·Filed 1974·Granted Mar 23, 1976·8 cites·10 claims
- 2652US4709409ATVRO receiver with surface mounted high frequency voltage-controlled oscillatorMA JOHN Y·Filed 1986·Granted Nov 24, 1987·13 cites·15 claims
- 2748US4619000ACATV converter having improved tuning circuitsMA JOHN·Filed 1984·Granted Oct 21, 1986·9 cites·7 claims
- 2844US5159711AInterference filter with high degree of selectivity for tvro receiver systemASTEC INT LTD·Filed 1990·Granted Oct 27, 1992·13 cites·8 claims
- 2935US4625183ALow-cost VCO using lumped elements in microwave bandCAPETRONIC BSR LTD·Filed 1985·Granted Nov 25, 1986·4 cites·18 claims
- 3031US4015075ATelevision receiver automatic frequency control systemZENITH RADIO CORP·Filed 1975·Granted Mar 29, 1977·1 cites·9 claims
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