| Patent Number |
Title Of Patent |
Date Issued |
| RE30883 |
Method of producing synthetic quartz glass |
March 16, 1982 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 4377405 |
Method for the production of flat, transparent vitreous silica slabs of low bubble content |
March 22, 1983 |
| 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 |
| 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 |
| 4235615 |
Method for the production of semiproduct for the production of light conducting fibers |
November 25, 1980 |
| 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 |
| 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 |
| 4102666 |
Method of surface crystallizing quartz |
July 25, 1978 |
| Quartz glass element, such as a diffusion tube useful in the production of semiconductor elements, capable of forming an outer layer of uniformly fine crystalline silica such as cristobalite or tridymite when heated to a temperature at which such crystalline silica forms containing c |
