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| Number | Title | Issue Date |
| 5061878 | Magnetron anode and method of manufacturing anode A magnetron anode is manufactured by producing a blank in a sheet of conductive material which is then bent to form an anode vane structure. The structure is then inserted in a cylindrical block and brazed in position to form the magnetron anode. The anod... | 10/29/1991 |
| 4949354 | Laser apparatus having a discharge triggering device inside a laser tube Laser apparatus includes a gas filled tube and is arranged to act as a switch to trigger, within the tube itself, a discharge. The power dissipated in the discharge is applied to material which forms, or is to form, a laser amplifying medium, to provide p... | 08/14/1990 |
| 4896073 | Discharge tubes A discharge tube arrangement, for example, a thyratron, in accordance with the invention has a first electrode arranged co-axially about a second electrode. Thus, in a thyratron, the anode may surround the cathode or vice versa. The envelope may be tubula... | 01/23/1990 |
| 4890295 | Laser apparatus Laser apparatus includes an outer envelope which contains a plurality of laser discharge tubes. Each of the laser discharge tubes includes copper pieces which, when vaporised, acts as a laser amplifying medium. Each of the laser discharge tubes is of the ... | 12/26/1989 |
| 4890034 | Thyratrons A thyratron includes a grid structure in which a grid element has a plurality of apertures therethrough, each of the apertures comprising two arcuate portions at different distances from the center of the grid which are connected by a radial portion. Thus... | 12/26/1989 |
| 4879490 | Gas discharge devices wherein electrons are injected into a high field region A gas discharge device includes means for injecting electrons into a high field region between an anode and a cathode structure located within a gas filled envelope. This causes ionisation within the region and triggers the device into conduction.... | 11/07/1989 |
| 4858237 | Electron beam apparatus A laser arrangement includes electron beam apparatus comprising a plurality of electrodes, each of which having an aperture therethrough. The apertures are aligned along the longitudinal axis of an envelope which surrounds them and contains gas. The elect... | 08/15/1989 |
| 4839554 | Apparatus for forming an electron beam sheet Apparatus for forming an electron beam sheet includes a cathode member having a slot in a front surface thereof, a grid electrode and the anode of a thyratron. When it is desired to trigger the thyratron into conduction, a suitably large potential differe... | 06/13/1989 |
| 4835616 | Method for operating an image sensor having an integration period uncoordinated with its frame period A CCD image sensor is operated in an asynchronous mode to enable it to capture short lived events, or to freeze rapid motion. The image is acquired during an integration period which is triggered by a strobe pulse, and the resulting charge is held in a st... | 05/30/1989 |
| 4833363 | Ignitron with arc-centering magnetic field An ignitron device is provided in which a permanent annular magnet at least partly surrounds the region between the ignitron anode and the surface of a mercury pool connected to the cathode terminal, the magnet being effective to create an axial magnetic ... | 05/23/1989 |
| 4831341 | Magnetron with tuning member moveable by passing current through it A magnetron includes a cathode and vane type anode structure. The frequency of oscillation of a microwave output signal of the magnetron is tunable by means of a tuning member, which is in the form of an annular plate arranged adjacent resonant cavities o... | 05/16/1989 |
| 4825446 | Laser apparatus having cathode bore directing electron beam onto anode Laser apparatus includes a ceramic tube within which is contained a gas and a cylindrical cathode having a plurality of holes therethrough. An anode is located along the axis of the tube. During operation of the apparatus, a large potential difference is ... | 04/25/1989 |
| 4820996 | Amplifying arrangements An amplifying arrangement includes a klystron in which an electron beam interacts with a high frequency signal to produce a modulated amplified signal. The high frequency signal is maintained at a substantially constant amplitude and modulation of the amp... | 04/11/1989 |
| 4810925 | Directly heated cathodes A directly heated cathode comprises a metal tube having a filling of powdered metal which extends beyond the tube and in which is embedded an electrical wire which is coaxial and extensive with said the outer tube over part of its length. The electrical w... | 03/07/1989 |
| 4805180 | Discharge tube apparatus Discharge tube apparatus includes an outer containing vessel and a structure comprising for example five metal cylinders located co-axially within it. Each of the metal cylinders includes projecting spacers on its outer surface which serve to space it fro... | 02/14/1989 |
| 4794614 | Discharge tubes A metal vapor discharge tube includes cylindrical dispenser blocks of sintered tungsten which are porous and support metal whose vapor is to form at least part of the active medium of the tube. Thus, the dispenser blocks retain the metal, holding it in po... | 12/27/1988 |
| 4774537 | Iris or shutter arrangements An iris and shutter arrangement for a camera, particularly a CCD camera, in which a first liquid crystal display is formed of a plurality of concentric annuli of liquid crystal material and a second liquid crystal display is provided as a further pluralit... | 09/27/1988 |
| 4761794 | Thyratron having thermionic cathode material between anode and control grid A thyratron comprises an anode and control grids between which is located a double layer screen grid. Thermionic cathode material is inserted in an aperture in the part of the screen grid furthest from the anode, and in operation this is heated to the req... | 08/02/1988 |
| 4761792 | Laser apparatus Laser apparatus comprising a discharge vessel of thermally insulating material and a protective metal layer disposed on the inner surface of the discharge vessel. During operation of the laser apparatus, copper powder is vaporised to form at least part of... | 08/02/1988 |
| 4758766 | Gas discharge devices utilizing electron injection for gas ionization A gas discharge device includes an anode, an enclosure member having an aperture therein and substantially enclosing a volume of a gas filling, and a mechanism for injecting electrons into the volume of gas filling to produce ionization of the gas filling... | 07/19/1988 |
| 4748377 | Travelling wave tubes A coupled cavity travelling wave tube has a coupling wall/ferro-magnetic pole piece formed as an iron-copper-iron sandwich with a coolant channel therein defined at least in part by the inner copper member of the sandwich. Where the coolant channel is def... | 05/31/1988 |
| 4746833 | Coupled cavity travelling wave tubes A coupled cavity TWT comprises a hollow copper tube having a plurality of tranverse walls of iron which define cavities. The walls each include an aperture on the longitudinal axis of the tube through which an electron beam passes during operation of the ... | 05/24/1988 |
| 4731650 | Spatial characteristic determination To determine some spatial characteristic, such as size or shape, of an object, the object is viewed with a television camera that employs an image sensor such as a CCD device. An image is formed on a television screen and a set of measurement markers (or ... | 03/15/1988 |
| 4728860 | Slidable seal for klystron vacuum tubes An external cavity klystron vacuum tube has a ceramic cylindrical wall surrounded by an external cavity within which is an output probe. The cylindrical wall section is sealed at its ends to other components of the tube--to enable the interior to be evacu... | 03/01/1988 |
| 4709186 | Coupled cavity travelling wave tubes A coupled cavity travelling wave tube of the space harmonic type is provided wherein the interaction gaps in successive cavities are alternately offset towards the input end of the slow wave structure and towards the output of the slow wave structure, whe... | 11/24/1987 |
| 4703226 | Thyratron having anode and multiple grids A thyratron includes an envelope containing a gas filling, an anode, an intermediate grid, control grids and a cylindrical structure which acts as a cathode heat shield in a conventional thyratron. In operation the intermediate grid is maintained at catho... | 10/27/1987 |
| 4698546 | Apparatus for forming electron beams The present invention provides apparatus for forming electron beams, which may be advantageously employed in many applications, for example in display devices or thyratrons. A cathode member has a hole in its front surface. All the surfaces of the cathode... | 10/06/1987 |
| 4695764 | Display arrangements A display arrangement consists of a tubular envelope with fluorescent stripes running along its length, localized portions of which are illuminated by different electron guns which produce flood beams of electrons. Each gun is situated within a switchable... | 09/22/1987 |
| 4695765 | Display arrangements A display arrangement consists of a tubular envelope with fluorescent stripes running along its length, localized portions of which are illuminated by different electron guns which produce flood beams of electrons. Field electrodes which surround each ele... | 09/22/1987 |
| 4673896 | Microwave transmitting and receiving arrangements A radar system having a common antenna for transmitting and receiving signals conventionally includes a branch duplexer which is bulky and inconvenient. By using a waveguide section having an antenna port at one end and a receiver port at the other, and i... | 06/16/1987 |
| 4658181 | Travelling wave tubes The invention provides a travelling wave tube having a directly heated cathode. Cathode material is applied in a depression in one U-shaped member of a high resistance alloy material and the return path for heater current is provided by another U-shaped s... | 04/14/1987 |
| 4646140 | Television cameras Television cameras using solid-state image sensors may be required to provide a good image of a scene under all normal night and day ambient light conditions. The available solid-state image sensors can cope satisfactorily with normal daylight, but do not... | 02/24/1987 |
| 4644407 | Display systems A display arrangement particularly suitable for displaying video signals representing a thermal image. Successive horizontal lines of a television raster pattern are offset, or staggered, by a small amount so as to remove vertical stripe patterns which ar... | 02/17/1987 |
| 4639643 | Thyratron interrupters A magnetic thyratron interrupter is provided having between an anode and a cathode a structure having an aperture therein for a discharge presenting a succession of surfaces in the direction of discharge which are contacted when the discharge is moved by ... | 01/27/1987 |
| 4623882 | Fluorescent display arrangement having field electrode adjacent cathode A display arrangement utilizes a fluorescent screen 3 to provide readily alterable bright displays. The arrangement can provide a fairly large display surface, but can be of very small thickness. It contains electron emissive cathodes 5, and field electro... | 11/18/1986 |
| 4619041 | Method for manufacturing coupled cavity travelling wave tubes A millimeter coupled cavity travelling wave tube has each of its slow wave structures formed of at least one longitudinally extending member having holes made therethrough by a hobbing process, which holes constitute at least in part the cavities of the s... | 10/28/1986 |
| 4620135 | Electric circuit interrupting devices A thyratron utilizable as a circuit interrupting protective device is provided. The thyratron includes an apertured grid between anode and cathode which is divided transversely into two parts separated by an insulating layer. Both surfaces of the composit... | 10/28/1986 |
| 4613786 | Image intensifiers and method of producing same A shielded faceplate for use in an image intensifier having a photocathode which comprises an inner core of glass transparent to light to which the photocathode is sensitive and an outer shielding region of glass which absorbs light to which the photocath... | 09/23/1986 |
| 4598465 | Method for fabricating coupled cavity travelling wave tubes A millimeter coupled cavity travelling wave tube has its slow wave structures formed by a hobbing process. In a preferred construction, each slow wave structure is made of two individual halves each extending for the length of the structure. Each half con... | 07/08/1986 |
| 4599542 | Linear beam tubes The invention provides a linear beam tube which may be protected against high voltage arcs between the cathode and anode of its electron gun by connecting to ground a limiting impedance in a series path from said anode. The anode is carried upon the end o... | 07/08/1986 |
