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"Transmission of documents via telephone wires is possible in principle, but the apparatus required is so expensive that it will never become a practical proposition."
Dennis Gabor, British physicist
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| Number | Title | Issue Date |
| 4952905 | Data communication system A communication system utilizing the electrical-supply wiring of mains circuit has an interface unit for an intruder-sensor. Unit has a transmitter for sending FSK-modulated messages and a capacitor to store adequate energy to power transmitter only for t... | 08/28/1990 |
| 4868917 | Radar arrangements A radar apparatus transmits right circular polarized signals and selects the right circular polarized components of the corresponding returns. It also transmits left circular polarized signals and selects the left circular polarized components of the corr... | 09/19/1989 |
| 4825766 | Fuzing arrangements A submunition has a metallic body 1 a sensor 4 for sensing the presence of metal and an extendable probe (e.g. a spring 3) separating the sensor 4 and body 1 to avoid interference with the sensor. A circuit including the metal sensor and an impact sensor ... | 05/02/1989 |
| 4377867 | Radiography A radiographic apparatus contains at least one source and at least one detector bank mounted on respective concentric annular rings; the patient's body being disposed inside the smaller ring. The rings are rotated in opposite directions and at such respec... | 03/22/1983 |
| 4316091 | CT Scanner A CT scanner is described in which the data acquisition components, i.e. the radiation source and detectors, are mounted in an apertured housing which can be deployed generally vertically, for the examination of recumbent patients, or generally horizontal... | 02/16/1982 |
| 4250761 | Rotary drive mechanisms In computerized tomographic apparatus having an intermittent rotational motion the scanning time can be reduced by increasing the rotation speed. However this can result in excessive forces being transmitted to the stationary mainframe of the equipment. T... | 02/17/1981 |
| 4231730 | Moulding video discs A means for moulding thermoplastics video discs having one or two shaped resilient compensators to maintain the stamper plates in parallelism with the plastics foil during moulding. The compensators may be of a rubber and may contain a thermally conductiv... | 11/04/1980 |
| 4211925 | CT Scanner with anode scan monitor In a variant of the type of radiographic apparatus known as CT scanners a scanning X-ray tube is used to provide a planar fan-shaped distribution and to scan the distribution in its plane. Means are also provided to rotate the system about an axis perpend... | 07/08/1980 |
| 4171476 | Radiography In a computerized tomographic apparatus in which the source and detectors are moved angularly around the body, the angular movement of the source is, in effect, periodically arrested so that the detectors, which are of greater angular extent than the dist... | 10/16/1979 |
| 4170734 | Energy regulator An electrical energy regulator, particularly suitable, for a portable X-ray machine. A transformer primary of a converter is supplied with half waves of a.c. via a transistor whose conduction interval during each half-wave is controllable to regulate the ... | 10/09/1979 |
| 4137455 | Medical radiographic apparatus with means for notating detector ring In a computer-assisted tomography (CAT) apparatus, in which a fan-shaped X-ray distribution is rotated about the patients body, it is possible to use a ring of stationary detectors disposed to receive the radiation after passage through the body. In this ... | 01/30/1979 |
| 4123659 | Radiography In a radiographic apparatus in which a scanning X-ray tube is used it is desirable to properly relate the scanning of the X-ray origin with other scanning motions of the apparatus. In this arrangement a scan progress detector is inserted partly into the r... | 10/31/1978 |
| 4115698 | Radiography Radiographic apparatus is described for evaluating the absorption coefficient of a body at each of a plurality of locations distributed over a slice of a body. A source is arranged to produce a fan-shaped beam of radiation which is directed through the bo... | 09/19/1978 |
| 4115691 | Apparatus for identifying computerized axial tomographs Radiographic apparatus includes indicium means for indelibly imprinting computerized axial tomographs with identification data which relates to the position of the tomographic slice in relation to a fixed datum position such as the top of a patient's head... | 09/19/1978 |
| 4097746 | Driving and positioning arrangement for radiography A driving and positioning arrangement for radiography includes a patient support which can be driven, in a direction longitudinally of the patient, through an aperture in a housing which contains the active elements of a computerised tomographic apparatus... | 06/27/1978 |
| 4084094 | Radiographic apparatus In a scanning radiographic apparatus, of a type which is particularly suitable for examining inanimate objects, a fixed source and detectors irradiate an object to be examined along a plurality of beam paths. The object is moved in relation to the source ... | 04/11/1978 |
| 4084093 | Fan beam traverse-and-rotate CT scanner In a medical radiographic apparatus of the kind in which a fan shaped spread of X-rays is subject to lateral and orbital motions, it is disclosed that the orbital step between each lateral scan need not be exactly related to the angular spread of the fan ... | 04/11/1978 |
| 4081132 | Credit cards and other security documents A security document has a carrier and two layers of magnetizable material one overlying the other, the carrier and layers being all bonded together. One layer is for the recording of information and the other layer has a magnetic structure which can be ex... | 03/28/1978 |
| 4070581 | Detection of radiation In a computerized axial tomographic apparatus it is proposed to use, as radiation detectors, alkali halide scintillator crystals cooperating with photodiodes to measure the light output therefrom, or else photodiodes directly sensitive to the radiation pa... | 01/24/1978 |
| 4039807 | Electron beam deflection arrangements having preshaping of the beam In an X-ray source for radiographic apparatus of the type known as computerized axial tomography (CAT) scanners it has been suggested to scan a beam of electrons across a target/anode to correspondingly scan a beam of X-rays relative to a patient. The tar... | 08/02/1977 |
| 4031395 | Radiography In a radiographic apparatus a source of radiation is arranged to scan a planar spread of radiation in a plane about the body of a patient being examined. A plurality of detector devices is arranged to provide data representing the absorption of the radiat... | 06/21/1977 |
