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| Number | Title | Issue Date |
| 5049175 | Method of manufacturing a glass body having a non-uniform refractive index A granular body, from which an article having a nonuniform refractive index may be formed, has grains of two substances which have different refractive indicies in a geometric distribution in the granular body corresponding to the geometric distribution o... | 09/17/1991 |
| 5003284 | Infrared radiator An infrared radiator includes a non-circular jacket tube made of quartz material, which may be quartz glass, the length of which is a multiple of the larger interior diameter and the interior of whch, in a sectional view, is separated into two areas, in e... | 03/26/1991 |
| 4978836 | Continuous oven Continuous ovens are known including heat radiators, especially electrical infrared radiators for the thermal treatment of thin, plate-like components, especially printed circuit boards fitted with electronic components, including a conveying device which... | 12/18/1990 |
| 4964227 | Apparatus for drying finely divided solids A vertical drying chamber, for the continuous drying of finely divided solids at temperatures in the range of 800° to 1000° C. by the evaporation of moisture adhering thereto, is formed by the interstice between an inner tube and an outer tube. The oute... | 10/23/1990 |
| 4962310 | Radiant unit Radiant units are known in the form of a plate-like assembly having a supporting frame which accommodates a plurality of radiant lamps on holders, the radiant lamps being shielded by a front cover and a back cover, the front cover, which is permeable to r... | 10/09/1990 |
| 4956059 | Process for the purification of granular silicon dioxide Granular silicon dioxide is placed in a treatment chamber which is heated to a temperature ranging from 700° to 1300° C. The chamber is then rotated for a prescribed period of time to mix the grains while a gaseous atmosphere of chlorine and/or hydrogen... | 09/11/1990 |
| 4923497 | Method for the continuous production of a tube or rod of vitreous fused silica A method for the continuous production of a tube or rod of vitreous fused silica. Silicon dioxide in particle form is heated in a crucible to the softening temperature and is withdrawn contiuously downward from a bottom outlet opening in which a shaping t... | 05/08/1990 |
| 4915474 | Transmission line for optical radiation and applications thereof A transmission line for optical radiation is disclosed, which has at least one optical fiber with core and cladding. The core consists of vitreous synthetic silicon dioxide, and the cladding of bitreous synthetic silicon dioxide doped with boric oxide and... | 04/10/1990 |
| 4915624 | Continuous oven for soldering electronic components Continuous ovens are known for soldering electronic components on circuit boards, with a conveyor belt having supports for the circuit boards, and having infrared radiators disposed in a spaced-apart relationship along the conveyor belt above and/or below... | 04/10/1990 |
| 4898604 | Method of manufacturing a blank for a light-weight mirror with a supporting structure A method of manufacturing a blank for a light-weight mirror. Graphite molding bodies are positioned at regular intervals on a base that functions as a mirror plate or backing plate. The base is surrounded up to the top of the molding bodies with a graphit... | 02/06/1990 |
| 4826521 | Method of manufacturing articles of extremely pure synthetic particulate silicon dioxide In the production of an article of extremely pure synthetic silicon dioxide, wherein silicon tetrachloride is mixed with water to effect hydrolysis, the resulting hydrolysis product is dried, and the resulting dried particulate product is further processe... | 05/02/1989 |
| 4775317 | Oven for the heat treatment of semiconductor substrates An oven for the heat treatment of semiconductor substrates, especially a diffusion oven, having an upright, heatable quartz tube and a support system made of up rods or tubes into which one or more diffusion racks can be inserted which accommodate the waf... | 10/04/1988 |
| 4720407 | Double-walled quartz-glass tube for semiconductor-technology processes A double-walled quartz-glass tube for semiconductor-technology processes. The overall structure comprises an inner tube surrounded by a coaxially positioned outer tube. An annular space is left between them. The ends of the tubes that face in the same dir... | 01/19/1988 |
| 4676814 | Method for the continuous building of a hollow cylindrical soot body having no internal support Disclosed is a method for the axial building up, in a vertical arrangement, of a hollow cylindrical soot body having no internal support and consisting substantially of silicon dioxide by means of at least one flame hydrolysis build-up burner serving for ... | 06/30/1987 |
| 4669938 | Apparatus for automatically loading a furnace with semiconductor wafers An apparatus for loading a furnace with semiconductor wafers is known, which has at least two heat treatment chambers (1A, 1B, 1C, 1D), each of them having an associated stationary loading unit (8) with a receptacle movable in the direction of the furnace... | 06/02/1987 |
| 4666495 | Apparatus for manufacturing stria-free, bubble-free and homogeneous quartz-glass plates A method of manufacturing practically stria-free, bubble-free, and homogeneous quartz-glass plates of any desired configuration and with a surface area that exceeds the cross-section of the full circular quartz-glass cylinder that is employed as a startin... | 05/19/1987 |
| 4653650 | Rack for supporting wafers for treatment A rack for supporting wafers has a pair of parallel struts with kerfs therealong for supporting the wafers. A dummy wafer is attached to the struts near each end of the struts to connect the struts structurally as the rack and serve as rack-handling handl... | 03/31/1987 |
| 4612023 | Method of manufacturing stria-free, bubble-free and homogeneous quartz-glass plates A method of manufacturing practically stria-free, bubble-free, and homogeneous quartz-glass plates of any desired configuration and with a surface area that exceeds the cross-section of the full circular quartz-glass cylinder that is employed as a startin... | 09/16/1986 |
| 4569452 | Silica glass tray made for wafers A tray made of silica glass or ceramic material with a seating component made out of U-shaped lengths, for disk-shaped elements and especially for round wafers, whereby the elements are secured in the seating component by means of slots. To provide a tray... | 02/11/1986 |
| 4530818 | Transparent fused silica bell for purposes relating to semiconductor technology An epitaxy bell of transparent fused silica is provided with a flanged, thick-walled tubular piece of transparent fused silica on the side on which a process gas is exhausted. The wall thickness of the constricted portion of the bell is increased toward t... | 07/23/1985 |
| 4530378 | Composite tubular body Tubular body of fused quartz and quartz glass with a seamless transition from the fused-quartz zone to the quartz-glass zone. The body is manufactured continuously in a hollow rotating metal cylinder by disposing silica against the rotating mold and addin... | 07/23/1985 |
| 4523885 | Apparatus for loading magazines into furnaces Apparatus for introducing silicon wafers in magazines into a process tube of a furnace or diffusion oven. At least two spaced silica tubes closed at the end next adjacent the process tube constitute supporting members for the loaded magazines and a clampi... | 06/18/1985 |
| 4514589 | Electrode connecting cable for cardiac pacemaker A cable for connecting a cardiac pacemaker to an electrode inserted in the heart through the blood stream utilizes a die-clad conductor or a number ofthem, especially several die-clad strands forming a twisted conductor of the stranded type, enclosed in a... | 04/30/1985 |
| 4499191 | Method and apparatus for the decomposition of specimens of solid organic substances Specimens of solid organic substances are decomposed by grinding the specimen to powder having particles of a size smaller than 75 microns, and then compressing the powder specimen. The compressed powder specimen is abraded by means of a scraper, and the ... | 02/12/1985 |
| 4488743 | Flange connection for quartz tubes To connect together tubular elements, such as pipes and the like, made of materials which are difficult to machine and handle, and which are expensive, such as quartz glass, or quartz materials or quartz-ceramic goods used, for example, in laboratory or c... | 12/18/1984 |
| 4477112 | Semiconductor substrate handling tray A generally trough-like elongated element is formed of quartz glass, open at the top, in which the side walls (2) which, preferably, have inclined portions (4) merging with the bottom wall (1) of the trough, are formed with through-slits (3), and the bott... | 10/16/1984 |
| 4475204 | Method and apparatus for the production of flat, transparent vitreous silica slabs of low bubble content Flat, transparent slabs of vitreous silica of optical quality are produced by melting granular starting material in a vacuum by means of an electrical heating system. The starting material is melted while sustaining a heat flow from the top to the bottom ... | 10/02/1984 |
| 4466700 | Lightweight mirror especially for astronomical purposes The lightweight mirror has a special core construction. The core consists of flat and/or tubular pieces which are joined together by means of a sintering composition. The sintering composition has open pores. In the production of the core, the sintering c... | 08/21/1984 |
| 4447130 | Light-weight mirror blank for astronomical purposes and method of making a supporting framework for such blanks A light-weight mirror for astronomical purposes is disclosed. The mirror consists of a mirror plate, a back plate and a supporting framework disposed between them and consisting of a plurality of rows of tubes. The rows of tubes are staggered one from the... | 05/08/1984 |
| 4437727 | Quartz glass envelope tube A quartz glass envelope tube for the preparation of a light guide fiber blank, the tube being in the form of a laminate in which the inner layer consists essentially of quartz glass made from rock crystal and the outer layer of synthetic quartz glass. Goo... | 03/20/1984 |
| 4431361 | Methods of and apparatus for transferring articles between carrier members Articles, such as fragile, delicate semiconductor wafers, in a first carrier member are caused to pass nearly, but not quite wholly, into a second carrier member by being pushed--against gravity--thereinto. The carrier members are then subjected to a disp... | 02/14/1984 |
| 4416680 | Method of making quartz glass crucibles, and apparatus carrying out the method To make quartz glass crucibles suitable for drawing of single crystal silicon for electronic semiconductor applications, granular crystalline quartz or amorphous quartz glass is introduced into a rotating hollow mold which has gas-pervious wall regions at... | 11/22/1983 |
| 4397897 | Bell of translucent fused silica for the precipitation of polysilicon Bell of translucent fused silica having an inner layer of transparent fused silica for the precipitation of polysilicon. The thickness of the transparent fused silica layer increases continuously towards the open end of the bell while the total wall thick... | 08/09/1983 |
| 4392715 | Optical fiber In an optical fiber having a core whose material consists essentially of vitreous silica, said core having a jacket of plastic which is optically effective at least on a length of 10 m reckoned from the light input end of the fiber and which has a refract... | 07/12/1983 |
| 4370158 | Heat-treating method for semiconductor components An improved method for the heat treatment of quartz-glass tubes at temperatures above 1200° C. is disclosed wherein a pressure is maintained within the glass tube which is 3 to 110 mm Hg higher than the pressure on the external surface of the quartz tube... | 01/25/1983 |
| 4368846 | Melting burner made of vitreous silica for the production of massive vitreous silica Melting burner of vitreous silica for the production of massive vitreous silica by the melting of silicon dioxide particles. Propulsion jets fed with oxygen are surrounded by a plurality of oxygen-fed heating jets forming a ring. Oxygen flows around the p... | 01/18/1983 |
| 4367768 | Refractory protective tube for the heat treatment of semiconductor components In a refractory protective tube for the heat treatment of semiconductor components which is constricted at one end and at such constricted end is provided with a treating or working gas inlet, said tube having opposite to said gas inlet a closed end provi... | 01/11/1983 |
| 4349203 | Flange connection to connect a metallic and a glass or ceramic structural element To provide a flange connection between two materials of substantially different thermal coefficient of expansion, for example a glass, typically quartz glass or ceramic material and a metallic material, for example cast iron or steel, with an interposed s... | 09/14/1982 |
| 4331383 | Light-weight mirror A light-weight mirror comprising a fused-silica mirror plate and a cellular or honeycombed supporting structure made of fused silica or a quartzose material. As it is being welded or fused to the supporting structure, the mirror plate is supported by supp... | 05/25/1982 |
| 4327057 | Apparatus for the combustion of harmful gases An apparatus for the oxidative combustion of harmful gases by means of a burner is disclosed. The apparatus comprises a vertically disposed cooling jacket provided with a coolant inlet and coolant outlet which surrounds a combustion chamber. The combustio... | 04/27/1982 |
