In 1608, Dutch eyeglass maker Hans Lipperhey filed the first patent for a working telescope. The patent was denied.
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| Number | Title | Issue Date |
| 6223538 | Ceramic lining The invention relates to a ceramic lining for combustion chambers (8) consisting of several juxtaposed elements (1) that are attached by means of a retention bolt (3) to the inside of a thermally highly stressed metallic support wall (4), whereby at least... | 05/01/2001 |
| 6190123 | Centrifugal compressor The object of the invention is to provide a method of operating a simply constructed centrifugal compressor equipped, in the region of the rear wall of the compressor impeller, with no sealing elements in the separating gap between the compressor impeller... | 02/20/2001 |
| 5827045 | Thermally loaded blade for a turbomachine In a thermally loaded blade for a turbomachine, the front edge of such a blade is made from a ceramic material for providing better protection. The front edge has a shell-shaped form which covers at least one part of the head stage against which flow occu... | 10/27/1998 |
| 5768114 | Converter circuit arrangement A converter circuit arrangement is disclosed. As a result of the fact that GTOs are hard driven, reverse-parallel connected diodes have a reverse current response dV/dt of 2 kV/μs to 10 kV/μs and a low-inductance freewheeling circuit is provided between... | 06/16/1998 |
| 5718867 | Alloy based on a silicide containing at least chromium and molybdenum An alloy based on a silicide containing at least chromium and molybdenum contains the following constituents in atomic percent: chromium 41-55, molybdenum 13-35 and silicon 25-35, or chromium 35-55, molybdenum 13-35, silicon 13-35, yttrium 0.001-0.3, and/... | 02/17/1998 |
| 5403149 | Stabailization device for extending the characteristic map of a compressor In a compressor, the stabilization device for extending the characteristic map consists of a co-rotating ring (2) rigidly connected to the runner blades (1), there being arranged between the ring (2) and the housing (3) of the compressor a recirculation d... | 04/04/1995 |
| 5164678 | Process for compensating nonlinearities in an amplifier circuit A process for compensating nonlinearities in an amplifier circuit. An input signal s(t) is amplified to form an output signal y(t) using an amplifier circuit subject to nonlinearities. In accordance with the invention, a predistortion filter is connected ... | 11/17/1992 |
| 5132768 | Semiconductor component with turn-off facility In a semiconductor component with turn-off facility of the GTO type with direct pressure contact, a balancing of the local pressure distribution in the region of the cathode fingers (7) which results in an improved alternating load resistance and also in ... | 07/21/1992 |
| 5101633 | Burner arrangement including coaxial swirler with extended vane portions This burner arrangement has a main feed channel (2) for a fuel-air mixture, which channel discharges into a combustion chamber (1). A swirler, which is provided with swirl vanes (5), is penetrated by a burner lance (3), and into which exit openings for th... | 04/07/1992 |
| 5085575 | Method for premixed combustion of a liquid fuel In a premixed type of combustion of a liquid fuel at high pressure, the injection of the fuel (4c, 4d) and its evaporation with a gaseous medium (5) is undertaken, in order to prevent premature ignition of the liquid/gaseous mixture in the burner itself, ... | 02/04/1992 |
| 5049777 | High-power radiator A high-power radiator for UV light comprises a quartz tube or glass tube (1) with electrodes (3, 4), which are arranged in pairs and are separated from one another in the circumferential direction. Together with the electrodes, the tube is partially embed... | 09/17/1991 |
| 5031016 | Semiconductor component with turn-off facility In a semiconductor component with turn-off facility of the GTO type with direct pressure contact, a balancing of the local pressure distribution in the region of the cathode fingers (7) which results in an improved alternating load resistance and also in ... | 07/09/1991 |
| 5013959 | High-power radiator A high-power radiator, especially for ultraviolet light, wherein in order to increase the efficiency in the case of UV high-power cylindrical radiators, the inner dielectrics (3) are very small in comparison with the outer dielectric tube. A privileged di... | 05/07/1991 |
| 5009858 | Device for generating ozone In an ozone generator of modular design, glass tubes (3) are installed, tightly packed, in a housing (2) and cast therein by a casting compound (4) of good thermal and/or electric conductivity. Double helixes (5) of steel wire are placed in the glass tube... | 04/23/1991 |
| 4986968 | Ozone generator In an ozone generator with enamel dielectric, to increase the ozone yield, the latter is built up on at least two enamel layers, the layer (4) facing the discharge space (5) having a smaller dielectric constant (ࣘ6) than the layer (3) lying underneath.... | 01/22/1991 |
| 4973228 | Rotor of a compression-wave engine The rotor (1) of a compression-wave engine has cells (6) on its periphery which are concavely curved on the two end faces of the rotor (1) inwards towards its center and towards the rotor axis. Consequently, the absolute trajectory of a particle runs from... | 11/27/1990 |
| 4971939 | Process for applying a catalyst layer composed of noble metals and/or noble-metal compounds to a support made of ceramic material Process for applying a catalyst layer (4) composed of noble metals and/or noble-metal compounds to a ceramic support (1), in which a foil (2) made of an Ag/Ti alloy is first placed on the surface of the support (1) and this is fused in vacuo by heat treat... | 11/20/1990 |
| 4967244 | Power semiconductor component with switch-off facility In a power semiconductor component with switch-off facility in which the switch-off capability is achieved by MCT unit cells, IGBT unit cells which are connected in parallel with the MCT unit cells are provided for switching on. This structure ensures an ... | 10/30/1990 |
| 4960570 | Ozone generator In order to enhance the efficiency of an ozone generator it is proposed that its outer electrodes (1,2) are formed essentially as metal plates arranged and separated from one another in pairs, between which a tube (3) or a layer of closely-spaced tubes (3... | 10/02/1990 |
| 4955072 | Method of generating an amplitude-modulated ISB transmission signal and apparatus for carrying out the method In the case of a method for the generation of an amplitude-modulated ISB transmission signal from different AF signal (NF1,2), the signal vectors are split into signal components (x1,y1 and x2,y2, respectively), components sums (X,Y) are formed from the s... | 09/04/1990 |
| 4896605 | Method of cut position determination for printing machines A method of cut position determination for printing machines, wherein in order to ensure a synchronous running of the paper webs (P1-P4) to be folded and cut into newspapers (16) on a printing machine for rotary offset printing or rotary letter press prin... | 01/30/1990 |