Inventor · disambiguated record
Ralph Oppelt
Also filed as: OPPELT RALPH
82 granted patents·3 pending applications·1,213 citations·filing 1983–2021
99Inventor score
Top patents by PatentIndex Score
85 records- 0196US7323874B2Combined positron emission tomography and magnetic resonance tomography unitSIEMENS AG·Filed 2006·Granted Jan 29, 2008·42 cites·11 claims
- 0296US7218113B2Magnetic resonance system and operating method for RF pulse optimizationSIEMENS AG·Filed 2005·Granted May 15, 2007·39 cites·13 claims
- 0394US6083164AUltrasound front-end circuit combining the transmitter and automatic transmit/receiver switchSIEMENS MEDICAL SYSTEMS INC·Filed 1998·Granted Jul 4, 2000·93 cites·16 claims
- 0494US4922204AArrangement for operating a symmetrical radio-frequency antenna in a nuclear magnetic resonance tomography apparatusSIEMENS AG·Filed 1989·Granted May 1, 1990·94 cites·5 claims
- 0591US4992769ALine transformerSIEMENS AG·Filed 1989·Granted Feb 12, 1991·45 cites·4 claims
- 0688US8055196B2Arrangement to transmit magnetic resonance signalsSIEMENS AG·Filed 2009·Granted Nov 8, 2011·16 cites·9 claims
- 0787US7522952B2Combined positron emission tomography and magnetic resonance tomography unitSIEMENS AG·Filed 2006·Granted Apr 21, 2009·54 cites·20 claims
- 0886US7834628B2Arrangement to transmit magnetic resonance signals via multiplexed multiplexer reception branchesSIEMENS AG·Filed 2008·Granted Nov 16, 2010·14 cites·15 claims
- 0984US5622177AUltrasound imaging system having a reduced number of lines between the base unit and the probeSIEMENS AG·Filed 1994·Granted Apr 22, 1997·90 cites·13 claims
- 1083US8379549B2Remotely fed moduleSIEMENS AG·Filed 2009·Granted Feb 19, 2013·11 cites·30 claims
- 1182US7221162B2RF transmitter arrangement for an MR system, and method for determining a setting parameter thereforSIEMENS AG·Filed 2004·Granted May 22, 2007·26 cites·7 claims
- 1282US5574372ADiagnostic magnetic resonance apparatus having a radio frequency shield between the radio frequency antenna and the gradient coil systemSIEMENS AG·Filed 1995·Granted Nov 12, 1996·57 cites·7 claims
- 1382US4945321Aπ/2 power dividerSIEMENS AG·Filed 1989·Granted Jul 31, 1990·27 cites·12 claims
- 1480US9817089B2MRI antenna coil selection unit within patient table cable ductBIBER STEPHAN·Filed 2012·Granted Nov 14, 2017·4 cites·23 claims
- 1580US5260658ADetuning circuit for resonators in a nuclear magnetic resonance imaging apparatusSIEMENS AG·Filed 1991·Granted Nov 9, 1993·48 cites·8 claims
- 1679US5153517ASurface resonator for a magnetic resonance imaging apparatusSIEMENS AG·Filed 1990·Granted Oct 6, 1992·44 cites·20 claims
- 1778US8526902B2Arrangement for processing a non-symmetrical and a symmetrical signalBIBER STEPHAN·Filed 2012·Granted Sep 3, 2013·5 cites·22 claims
- 1877US5603324ADuplexer including a field-effect transistor for use in an ultrasound imaging systemSIEMENS AG·Filed 1995·Granted Feb 18, 1997·82 cites·7 claims
- 1977US5200701AMagnetic resonance imaging apparatus with regulator for reducing eddy current effectsSIEMENS AG·Filed 1991·Granted Apr 6, 1993·41 cites·15 claims
- 2076US9857495B2Apparatus for checking for a presence of an electrically conductive body, and charging systemSIEMENS AG·Filed 2015·Granted Jan 2, 2018·3 cites·8 claims
- 2176US7126337B2Reception unit for a magnetic resonance tomography apparatusSIEMENS AG·Filed 2005·Granted Oct 24, 2006·8 cites·11 claims
- 2276US5144241ACircularly polarizing rf antenna for an mri apparatus having a c-magnetSIEMENS AG·Filed 1990·Granted Sep 1, 1992·39 cites·18 claims
- 2374US6573788B2Amplifier device with frequency-response-compensating amplifier reactance, and use of the amplifier deviceSIEMENS AG·Filed 2001·Granted Jun 3, 2003·19 cites·12 claims
- 2474US6492817B2Electrical conductor arrangementSIEMENS AG·Filed 2001·Granted Dec 10, 2002·17 cites·25 claims
- 2571US7683330B2Method for determining positron emission measurement information in the context of positron emission tomographySIEMENS AG·Filed 2006·Granted Mar 23, 2010·6 cites·22 claims
- 2671US7482592B2Method for combining PET with MR perfusion and diffusionSIEMENS AG·Filed 2006·Granted Jan 27, 2009·6 cites·14 claims
- 2770US7890070B2Filter circuit arrangementSIEMENS AG·Filed 2007·Granted Feb 15, 2011·4 cites·16 claims
- 2869US9134392B2Dual imaging acquisition using common time-base frequencyCARUBA JAMES FRANK·Filed 2010·Granted Sep 15, 2015·2 cites·18 claims
- 2969US8866482B2Preprocessing circuit for receive signals of a local coilBOLLENBECK JAN·Filed 2011·Granted Oct 21, 2014·4 cites·22 claims
- 3065US7239144B2Antenna amplifier, in particular for a magnetic resonance antennaSIEMENS AG·Filed 2005·Granted Jul 3, 2007·4 cites·17 claims
- 3165US6714093B2Dynamics compressor for an analog signal to be compressedSIEMENS AG·Filed 2002·Granted Mar 30, 2004·8 cites·25 claims
- 3265US4951012ATransformer arrangement to accomplish impedance transformationSIEMENS AG·Filed 1989·Granted Aug 21, 1990·14 cites·10 claims
- 3364US9529067B2Arrangement for the transmission of magnetic resonance signalsBOLLENBECK JAN·Filed 2013·Granted Dec 27, 2016·1 cites·17 claims
- 3462US4841249ATruncated cone shaped surface resonator for nuclear magnetic resonance tomographySIEMENS AG·Filed 1987·Granted Jun 20, 1989·19 cites·3 claims
- 3561US5724312AUltrasound transducer head with integrated variable-gain amplifier devicesSIEMENS AG·Filed 1996·Granted Mar 3, 1998·20 cites·16 claims
- 3660US7432764B2Push-pull amplifier with transformational negative feedbackSIEMENS AG·Filed 2006·Granted Oct 7, 2008·4 cites·16 claims
- 3759US9154106B2Broadband balunOPPELT RALPH·Filed 2012·Granted Oct 6, 2015·1 cites·20 claims
- 3858US6580317B1Low-noise broadband amplifier device having negative feedback via a controlled current source, and use of the amplifier deviceSIEMENS AG·Filed 2000·Granted Jun 17, 2003·9 cites·13 claims
- 3957US12046822B2Participant of a communication system with a magnetic antennaFRAUNHOFER GES FORSCHUNG·Filed 2021·Granted Jul 23, 2024·0 cites·20 claims
- 4057US10365336B2Continuously digitally adjustable phase actuatorSIEMENS HEALTHCARE GMBH·Filed 2018·Granted Jul 30, 2019·0 cites·16 claims
- 4155US6954666B2Method for local reduction of the operating noise produced by a medical diagnostic or therapy device, and medical diagnostic or therapy device having a device for implementing such a methodSIEMENS AG·Filed 2003·Granted Oct 11, 2005·11 cites·21 claims
- 4255US6704589B1Method and device for recording an image of an object surface using focussed radiationSIEMENS AG·Filed 2000·Granted Mar 9, 2004·3 cites·20 claims
- 4355US6074346ATransmit/receive ultrasound front end circuit providing automatic transmit/receive switchingSIEMENS MEDICAL SYSTEMS INC·Filed 1997·Granted Jun 13, 2000·32 cites·35 claims
- 4454US6838936B2Low-noise amplifier device having negative feedback via a controlled current source, and method of using the amplifier deviceSIEMENS AG·Filed 2003·Granted Jan 4, 2005·7 cites·15 claims
- 4554US5144239ACircularly polarizing rf antenna for an mri apparatusSIEMENS AG·Filed 1990·Granted Sep 1, 1992·16 cites·2 claims
- 4654US4592029AArray apparatus for reading-out a two-dimensional charge imageSIEMENS AG·Filed 1983·Granted May 27, 1986·22 cites·16 claims
- 4753US10247792B2Field-coupled connection technique for linking coils and/or patient tables in magnetic resonance imagingBIBER STEPHAN·Filed 2015·Granted Apr 2, 2019·0 cites·20 claims
- 4853US9954700B2Transmitting a frequency-modulated signalOPPELT RALPH·Filed 2015·Granted Apr 24, 2018·1 cites·17 claims
- 4953US5128615AResonator for a magnetic resonance imaging apparatusSIEMENS AG·Filed 1990·Granted Jul 7, 1992·16 cites·4 claims
- 5052US8360962B2Position control of medical appliances in the human body by means of phase difference measurementSIEMENS AG·Filed 2008·Granted Jan 29, 2013·0 cites·22 claims
Showing the top 50 of 85 patent records by PatentIndex Score.
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