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| Number | Title | Issue Date |
| 4700127 | Microwave probe and rotary body detecting apparatus using the same A microwave probe has a cylindrical support made of stabilized zirconia being excellent in heat insulation, and the cylindrical support is threadably installed at a partitioning wall to partition an atmosphere of high temperature. The support is provided ... | 10/13/1987 |
| 4634963 | Method and apparatus for the testing of dielectric materials Method and apparatus for the nondestructive testing of metal-clad microwave circuit boards to determine dielectric constant variations within the dielectric sheets of such boards. The method involves using injected microwave energy to measure values relat... | 01/06/1987 |
| 4607224 | Double post reentrant cavity for NMR probes A sample cavity resonator for NMR spectroscopy contains a pair of diametrically opposed paraxial post structures approximating a single turn inductance about the axially positioned sample. The posts are separately excited in 180 degree relative phases by ... | 08/19/1986 |
| 4604898 | Pressure measuring device A device is provided comprising a circuit using the properties of a resonating cavity sensor whose resonance frequency is modified by the electric capacity variations due to the mechanical deformation of a wall under the effect of the pressure to be measu... | 08/12/1986 |
| 4463308 | R.F. Impedance determination To derive information about the R.F. impedance (Zt) presented at a port (P) of an electrical network including a source of R.F. signals (for example, an antenna and an antenna tuning unit) without requiring an additional source of R.F. signals,... | 07/31/1984 |
| 4353027 | Contactless resistivity measurement method and apparatus Methods and apparatus for contactless, non-destructive resistivity measurnts on semiconducting crystalline material, for example gallium arsenide. The material to be tested is formed into a disc which is supported within an air gap. The holder for the di... | 10/05/1982 |
| 4350883 | Method of marking and of identifying objects marked by electrically conducting elements A method of marking and of identifying objects (1) which are non-conductors of electricity by inclusion of conducting masses and detection by passage through a high-frequency electromagnetic field and detection of the variation in the corresponding respon... | 09/21/1982 |
| 4334187 | Phase sensor for R.F. transmission lines A phase sensing device is described which is useful for indicating the reance condition of a complex load impedance (such as an antenna), with a high degree of accuracy over the frequency range from 3 to 100 MHz. The device uses readily available transmi... | 06/08/1982 |
| 4220915 | Resistivity measurement system A system for measuring the bulk resistivity or sheet resistance of a sample of material includes a source of r.f. signals, a transmitting device and receiving device. The sample is placed between the transmitter and the receiver. A display is used to moni... | 09/02/1980 |
| 4135131 | Microwave time delay spectroscopic methods and apparatus for remote interrogation of biological targets Remote interrogation of biological targets is accomplished in accordance h the present invention by method and apparatus wherein a microwave signal is generated which varies in frequency from a first frequency to a second frequency in a predetermined tim... | 01/16/1979 |
| 4132943 | Remote sensing of hydrocarbon gas seeps utilizing microwave energy A radar transmitter directs a beam of microwve energy at a first frequency through the atmosphere. A gas seep in the atmosphere irradiated by the beam of microwave energy is excited to emit microwave energy at a second frequency characteristic of the part... | 01/02/1979 |
| 3965416 | Dielectric-constant measuring apparatus Accurate and stable measurement of the dielectric constant of a substance or a mixture of substances is achieved by the use of an oscillatory system incorporating a shorted transmission line as a delay means, to cycle the system. The substance for which t... | 06/22/1976 |
| 3942107 | Method and apparatus employing thin conductive films on flexible nonconductive sheets for non-destructive measurement of electrical characteristics In a non-destructive, production-oriented technique for measuring an electrical characteristic of a material, a first nonconductive flexible sheet having a first conductive pattern thereon is pressed against a portion of the surface of the material, and a... | 03/02/1976 |
