Inventor · disambiguated record
Sadao Igarashi
Also filed as: IGARASHI SADAO
26 granted patents·2 pending applications·685 citations·filing 1977–2010
97Inventor score
Files withALPS ELECTRIC CO LTD23NAGAYAMA AKIRA2NEC ELECTRONICS CORP1OMRON TATEISI ELECTRONICS CO1RF CHIPS TECHNOLOGY INC1
Top patents by PatentIndex Score
28 records- 0197US4725793AWaveguide-microstrip line converterALPS ELECTRIC CO LTD·Filed 1986·Granted Feb 16, 1988·145 cites·1 claims
- 0296US4152669APhase locked loop with means for preventing locking at undesired frequenciesALPS ELECTRIC CO LTD·Filed 1977·Granted May 1, 1979·50 cites·5 claims
- 0388US4761624AMicrowave band-pass filterALPS ELECTRIC CO LTD·Filed 1987·Granted Aug 2, 1988·46 cites·3 claims
- 0485US7369067B2Optical coupled type isolation circuitNEC ELECTRONICS CORP·Filed 2006·Granted May 6, 2008·20 cites·10 claims
- 0582US4725798AWaveguide filterALPS ELECTRIC CO LTD·Filed 1986·Granted Feb 16, 1988·29 cites·6 claims
- 0681US4504796AMicrowave circuit apparatusALPS ELECTRIC CO LTD·Filed 1982·Granted Mar 12, 1985·21 cites·3 claims
- 0775US4716387AWaveguide-microstrip line converterALPS ELECTRIC CO LTD·Filed 1986·Granted Dec 29, 1987·21 cites·10 claims
- 0874US5900782AAGC voltage correction circuitALPS ELECTRIC CO LTD·Filed 1997·Granted May 4, 1999·35 cites·13 claims
- 0972US6980776B2Transceiver apparatusRF CHIPS TECHNOLOGY INC·Filed 2002·Granted Dec 27, 2005·21 cites·4 claims
- 1071US5900781AMultistage variable gain amplifier circuitALPS ELECTRIC CO LTD·Filed 1997·Granted May 4, 1999·30 cites·6 claims
- 1170US5926749AAmplifier circuit having common AGC to IF and RF amplifiers for use in a transmitterALPS ELECTRIC CO LTD·Filed 1997·Granted Jul 20, 1999·31 cites·1 claims
- 1270US4369414AHigh-frequency input circuit for two inputsALPS ELECTRIC CO LTD·Filed 1980·Granted Jan 18, 1983·16 cites·5 claims
- 1369US4306311ADouble-balanced mixer circuitALPS ELECTRIC CO LTD·Filed 1979·Granted Dec 15, 1981·16 cites·15 claims
- 1468US5329189AMixer circuitALPS ELECTRIC CO LTD·Filed 1992·Granted Jul 12, 1994·32 cites·2 claims
- 1563US5418500AHigh-frequency oscillator circuitALPS ELECTRIC CO LTD·Filed 1993·Granted May 23, 1995·24 cites·5 claims
- 1663US5057788A2-stage differential amplifier connected in cascadeALPS ELECTRIC CO LTD·Filed 1990·Granted Oct 15, 1991·18 cites·1 claims
- 1757US4701728AWaveguide filterALPS ELECTRIC CO LTD·Filed 1986·Granted Oct 20, 1987·12 cites·4 claims
- 1856US4799033AMicrowave separatorALPS ELECTRIC CO LTD·Filed 1987·Granted Jan 17, 1989·12 cites·1 claims
- 1955US4426627APhase-locked loop oscillator circuit utilizing a sub-loop with a second phase comparatorALPS ELECTRIC CO LTD·Filed 1981·Granted Jan 17, 1984·12 cites·11 claims
- 2052US5327097AGain control circuitALPS ELECTRIC CO LTD·Filed 1993·Granted Jul 5, 1994·12 cites·24 claims
- 2149US6236848B1Receiver integrated circuit for mobile telephoneALPS ELECTRIC CO LTD·Filed 1997·Granted May 22, 2001·24 cites·6 claims
- 2248US5532650AHigh-frequency amplifierALPS ELECTRIC CO LTD·Filed 1995·Granted Jul 2, 1996·11 cites·7 claims
- 2347US4983976ASignal transmission system and methodOMRON TATEISI ELECTRONICS CO·Filed 1989·Granted Jan 8, 1991·17 cites·19 claims
- 2445US5115317ATuning apparatus for a television receiver including selectively activated amplifier and local oscillator circuitsALPS ELECTRIC CO LTD·Filed 1990·Granted May 19, 1992·12 cites·8 claims
- 2544US4724408AWaveguide filterALPS ELECTRIC CO LTD·Filed 1986·Granted Feb 9, 1988·7 cites·2 claims
- 2637US6351504B1Reception circuitALPS ELECTRIC CO LTD·Filed 1998·Granted Feb 26, 2002·11 cites·8 claims
- 2731US2012149315A1Detector Device, and Amplification Device, Transmission Device, and Communication Device Using the Detector DeviceNAGAYAMA AKIRA·Filed 2010·Application pending·0 cites
- 2831US2012270512A1Transfer Gate Circuit and Power Combining Circuit, Power Amplifying Circuit, Transmission Device, and Communication Device Using the Transfer Gate CircuitNAGAYAMA AKIRA·Filed 2010·Application pending·0 cites
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →