Ralph Oppelt
82Patents
16h-index
50Co-inventors
87Inventor score
Filing activity: Jun 13, 1983 → Sep 24, 2021
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6083164A | Ultrasound front-end circuit combining the transmitter and automatic transmit/receiver switch | Physics | 69 | Expired |
| US5622177A | Ultrasound imaging system having a reduced number of lines between the base unit and the probe | Physics | 55 | Expired |
| US5603324A | Duplexer including a field-effect transistor for use in an ultrasound imaging system | Electricity | 54 | Expired |
| US4922204A | Arrangement for operating a symmetrical radio-frequency antenna in a nuclear magnetic resonance tomography apparatus | Physics | 49 | Expired |
| US5574372A | Diagnostic magnetic resonance apparatus having a radio frequency shield between the radio frequency antenna and the gradient coil system | Physics | 35 | Expired |
| US7522952B2 | Combined positron emission tomography and magnetic resonance tomography unit | Human Necessities | 34 | Active |
| US4992769A | Line transformer | Electricity | 34 | Expired |
| US5153517A | Surface resonator for a magnetic resonance imaging apparatus | Physics | 31 | Expired |
| US5260658A | Detuning circuit for resonators in a nuclear magnetic resonance imaging apparatus | Physics | 28 | Expired |
| US7218113B2 | Magnetic resonance system and operating method for RF pulse optimization | Physics | 21 | Expired |
| US7323874B2 | Combined positron emission tomography and magnetic resonance tomography unit | Physics | 21 | Expired |
| US5144241A | Circularly polarizing RF antenna for an MRI apparatus having a C-magnet | Physics | 21 | Expired |
| US6074346A | Transmit/receive ultrasound front end circuit providing automatic transmit/receive switching | Physics | 19 | Expired |
| US4592029A | Array apparatus for reading-out a two-dimensional charge image | Electricity | 18 | Expired |
| US4945321A | .pi./2 power divider | Electricity | 18 | Expired |
| US5200701A | Magnetic resonance imaging apparatus with regulator for reducing eddy current effects | Physics | 16 | Expired |
| US7221162B2 | RF transmitter arrangement for an MR system, and method for determining a setting parameter therefor | Physics | 13 | Expired |
| US6269052A | Transmitting/receiving circuit and transmitting/receiving method for a transducer | Emerging Cross-Sectional Technologies | 12 | Expired |
| US4841249A | Truncated cone shaped surface resonator for nuclear magnetic resonance tomography | Physics | 11 | Expired |
| US5144239A | Circularly polarizing RF antenna for an MRI apparatus | Physics | 10 | Expired |
| US5724312A | Ultrasound transducer head with integrated variable-gain amplifier devices | Electricity | 10 | Expired |
| US6573788B2 | Amplifier device with frequency-response-compensating amplifier reactance, and use of the amplifier device | Electricity | 10 | Expired |
| US7834628B2 | Arrangement to transmit magnetic resonance signals via multiplexed multiplexer reception branches | Physics | 9 | Active |
| US8055196B2 | Arrangement to transmit magnetic resonance signals | Physics | 9 | Active |
| US6954666B2 | Method 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 method | Human Necessities | 8 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.