| Patent Number |
Title Of Patent |
Date Issued |
| 5049175 |
Method of manufacturing a glass body having a non-uniform refractive index |
September 17, 1991 |
| 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 of the substances required for |
| 5003284 |
Infrared radiator |
March 26, 1991 |
| 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 each of which a heating wire exten |
| 4978836 |
Continuous oven |
December 18, 1990 |
| 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 has two spaced-apart, parall |
| 4964227 |
Apparatus for drying finely divided solids |
October 23, 1990 |
| A vertical drying chamber, for the continuous drying of finely divided solids at temperatures in the range of 800.degree. to 1000.degree. C. by the evaporation of moisture adhering thereto, is formed by the interstice between an inner tube and an outer tube. The outer tube is surrounded |
| 4962310 |
Radiant unit |
October 9, 1990 |
| 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 radiation, being held removabl |
| 4956059 |
Process for the purification of granular silicon dioxide |
September 11, 1990 |
| Granular silicon dioxide is placed in a treatment chamber which is heated to a temperature ranging from 700.degree. to 1300.degree. 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 chloride is passed t |
| 4915624 |
Continuous oven for soldering electronic components |
April 10, 1990 |
| 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 the plane of belt movement, whic |
| 4915474 |
Transmission line for optical radiation and applications thereof |
April 10, 1990 |
| 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/or fluorine. The fiber is cooled |
| 4898604 |
Method of manufacturing a blank for a light-weight mirror with a supporting structure |
February 6, 1990 |
| 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 graphite wall. The interstices betwe |
| 4842628 |
Method of verifying a porous article made out of glass soot and furnace for carrying out the met |
June 27, 1989 |
| A method of vitrifying a porous cylindrical article made out of glass soot, especially for manufacturing a preliminary blank for optical fibers. The article is heat-treated in a furnace in a vacuum or in an atmosphere that contains helium. The porous article is placed in a horizontal gra |
| 4826521 |
Method of manufacturing articles of extremely pure synthetic particulate silicon dioxide |
May 2, 1989 |
| 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 processed into the desired article, t |
| 4775317 |
Oven for the heat treatment of semiconductor substrates |
October 4, 1988 |
| 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 wafer-like substrates separated from |
| 4720407 |
Double-walled quartz-glass tube for semiconductor-technology processes |
January 19, 1988 |
| 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 direction each have a closure. A |
| 4676814 |
Method for the continuous building of a hollow cylindrical soot body having no internal support |
June 30, 1987 |
| 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 the soot production. In this meth |
| 4669938 |
Apparatus for automatically loading a furnace with semiconductor wafers |
June 2, 1987 |
| 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 axis via a feed apparatus and |
| 4666495 |
Apparatus for manufacturing stria-free, bubble-free and homogeneous quartz-glass plates |
May 19, 1987 |
| 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 starting material. The cylinder is c |
| 4653650 |
Rack for supporting wafers for treatment |
March 31, 1987 |
| 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 handles. The dummy wafers are parallel |
| 4612023 |
Method of manufacturing stria-free, bubble-free and homogeneous quartz-glass plates |
September 16, 1986 |
| 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 starting material. The cylinder is c |
| 4569452 |
Silica glass tray made for wafers |
February 11, 1986 |
| 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 that is shaped in such a way as |
| 4530818 |
Transparent fused silica bell for purposes relating to semiconductor technology |
July 23, 1985 |
| 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 the transparent fused silica t |
| 4530378 |
Composite tubular body |
July 23, 1985 |
| 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 adding thereto, such as in an annular |
| 4523885 |
Apparatus for loading magazines into furnaces |
June 18, 1985 |
| 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 clamping device holds and supports said |
| 4499191 |
Method and apparatus for the decomposition of specimens of solid organic substances |
February 12, 1985 |
| 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 abraded material metered out in |
| 4488743 |
Flange connection for quartz tubes |
December 18, 1984 |
| 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 chemical processing apparatus, |
| 4477112 |
Semiconductor substrate handling tray |
October 16, 1984 |
| 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 bottom wall is formed with slots (5) |
| 4475204 |
Method and apparatus for the production of flat, transparent vitreous silica slabs of low bubble |
October 2, 1984 |
| 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 of the crucible. The bottom o |
| 4466700 |
Lightweight mirror especially for astronomical purposes |
August 21, 1984 |
| 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 composition is poured into int |
| 4447130 |
Light-weight mirror blank for astronomical purposes and method of making a supporting framework |
May 8, 1984 |
| 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 other. Each tube in a row has a |
| 4445523 |
Apparatus for the surface cleaning of quartz-crystal pieces |
May 1, 1984 |
| Apparatus for cleaning the surface of small quartz-crystal pieces with aqueous hydrofluoric acid is disclosed wherein the quartz pieces are introduced into a vessel containing a conveying means and conveyed e.g. horizontally in counter-current to aqueous hydrofluoric acid introduced at |
| 4437727 |
Quartz glass envelope tube |
March 20, 1984 |
| 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. Good mechanical properties, especial |
| 4431361 |
Methods of and apparatus for transferring articles between carrier members |
February 14, 1984 |
| 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 displacement, e.g. by inversion, |
| 4416680 |
Method of making quartz glass crucibles, and apparatus carrying out the method |
November 22, 1983 |
| 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 the side walls and bottom thereo |
| 4414014 |
Method of producing a bubble-free vitreous material |
November 8, 1983 |
| For the production of a bubble-free vitreous material, and in particular bubble-free vitreous silica, bubbles-containing vitreous material is exposed in a furnace, at a temperature which reduces its viscosity to a value between 10.sup.13.5 and 10.sup.8 Pa.sec, to the omnidirectional |
| 4397897 |
Bell of translucent fused silica for the precipitation of polysilicon |
August 9, 1983 |
| 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 thickness of the bell is kept constant |
| 4392715 |
Optical fiber |
July 12, 1983 |
| 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 refractive index n.sub.M which is smalle |
| 4370158 |
Heat-treating method for semiconductor components |
January 25, 1983 |
| An improved method for the heat treatment of quartz-glass tubes at temperatures above 1200.degree. 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 over the heated area o |
| 4368846 |
Melting burner made of vitreous silica for the production of massive vitreous silica |
January 18, 1983 |
| 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 propulsion jets and the heating |
| 4367768 |
Refractory protective tube for the heat treatment of semiconductor components |
January 11, 1983 |
| 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 provided with a gas outlet, the improv |
| 4349203 |
Flange connection to connect a metallic and a glass or ceramic structural element |
September 14, 1982 |
| 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 sealing ring of an elastomer, for |
| 4340627 |
Wound and sintered vitreous silica article and method of making |
July 20, 1982 |
| A method is described for the production of porous bodies from vitreous silica without the use of tools. Vitreous silica wool and/or threads are wound in layers on a form. After the coil has attained a certain minimum thickness, the threads of each succeeding layer are permanently bonded |
| 4339311 |
Baths and processes for electrodepositing palladium |
July 13, 1982 |
| A process for electrodeposition of palladium is described wherein an electroplating bath comprising a palladium(II) compound is employed which electroplating bath is ammonia-free. The bath contains water and an amine of the formula ##STR1## wherein x=0 or 1 and when x=0: ##ST |
| 4331383 |
Light-weight mirror |
May 25, 1982 |
| 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 supporting elements comprising seatin |
| 4327057 |
Apparatus for the combustion of harmful gases |
April 27, 1982 |
| 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 combustion chamber is connected to and in |
| 4228129 |
Cleaning attachment to clean flask-shaped receivers of chemical analysis apparatus |
October 14, 1980 |
| An essentially circular header is formed with an interior trough to which a supply duct for cleaning fluid, terminating therein tangentially so that cleaning fluid introduced through the supply duct into the trough of the header and flowing thereinto will be subjected to a swirling motio |
| 4165915 |
Light conducting fiber |
August 28, 1979 |
| A semiproduct for use in the manufacture of light conducting fibers comprising a core of synthetic quartz glass having a thickness of 6 to 400 mm, the quartz glass containing less than 10 ppm hydroxyl ions and having, in the near infrared spectral range, an optical loss totaling less tha |
| 4162908 |
Method of producing synthetic quartz glass, apparatus for the practice of the method, and use of |
July 31, 1979 |
| An improvement in a method for producing a synthetic hydroxyl ion-free quartz glass wherein a hydrogen free silicon compound is heated in a hydrogen-free gas stream while the gas stream is passed through an induction coupled plasma burner, the gas stream containing elemental and/or b |
| 4045198 |
Method of preparing a foreproduct for the production of an optical lightconductor |
August 30, 1977 |
| There is disclosed a process for preparing a foreproduct useful in the production of an optical self-focusing lightconductor in which the index of refraction of the lightconductor diminishes with increasing distance from the conductor axis such that, when plotted against the conductor |
