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| Number | Title | Issue Date |
| 7197899 | Multi heating zone apparatus and process for making core/clad glass fibers A process includes the steps of disposing a solid core glass rod at a point removed from hot temperature that can cause crystallization in the core glass rod, disposing a solid clad glass rod at a point removed from the core glass rod; softening to the flowing condi... | 04/03/2007 |
| 7185517 | Double crucible for a glass drawing method and method of making glass fiber or a preform with the double crucible The double crucible for a glass drawing method has a heatable outer crucible (1) and an inner crucible (2) surrounded by the outer crucible (1), which is heatable separately from the outer crucible (1). Both crucibles (1,2) have an... | 03/06/2007 |
| 7072562 | Optical fibers made from multicomponent glass The stepped optical fiber has a core glass member and a surrounding cladding glass member. It has a high numerical aperture (NA)≧0.50. The core glass member preferably has a zinc-containing composition including, in % by weight, SiO2, 42 to 53; ZnO, 16 ... | 07/04/2006 |
| 6739155 | Quartz making an elongated fused quartz article using a furnace with metal-lined walls A crucible for melting a silica for fusion of said silica into a desired shape. The crucible having a main body with inner and outer surfaces comprised of a refractory material. In addition, at least a portion of the inner surface includes a barrier layer comprised ... | 05/25/2004 |
| 6620350 | Method for making gradient refractive index optical components A method for making gradient refractive index optical components includes mixing a molten basic material (11) with a refractive index modifying material (21) in continuously changing proportions. The mixture is changed into a plurality of semi-molten fibe... | 09/16/2003 |
| 6550279 | Process for drawing optical fiber from a multiple crucible apparatus with a thermal gradient The disclosed invention includes a method of making an optical fiber drawn from a multiple crucible. The method includes moving a first crucible of the multiple crucible relative to a second crucible of the multiple crucible. The invention also includes m... | 04/22/2003 |
| 6526782 | Multi heating zone apparatus and process for making core/clad glass fibers This invention pertains to apparatus and process for making core/clad glass fibers. The apparatus includes a central tube or receptacle connected at the top to a pressure controller and terminating in a reduced section; a side tube or receptacle positione... | 03/04/2003 |
| 6519975 | Method of making fluorinated rare earth doped glass and glass-ceramic waveguides The present invention is directed to a fluorinated rare earth doped glass composition and method for making a glass-ceramic optical article therefrom, e.g. optical fiber waveguides, fiber lasers and active fiber amplifiers, having application in the 1300 ... | 02/18/2003 |
| 6250112 | Method of controlling an extrusion of glass to make an optical fiber A double crucible fiber fabrication system employing a rod to control flow of the core material to produce a core of desired diameter. The rod fits closely within the inner crucible and moves at a speed necessary to produce a core material flow rate which... | 06/26/2001 |
| 6010787 | Glass compositions for core/cladding type distributed index optical element Glass compositions for a core/cladding type distributed-index optical element produced by a thermal-interdiffusion process using a double crucible is provided. The glass compositions comprises a glass composition for core containing 18 mol % | 01/04/2000 |
| 5900036 | Multi-cylinder apparatus for making optical fibers, process and product A vertically disposed apparatus used to make core-clad optical fibers inces an inner elongated cylinder removably closed at the top and provided at the bottom with an inner exit port of a smaller diameter than the inner cylinder and an outer cylinder, di... | 05/04/1999 |
| 5879426 | Process for making optical fibers from core and cladding glass rods A core/clad glass optical fiber is made by melting a core glass rod and a adding glass rod in separate crucibles which are not intersecting with respect to each other and the respective core and cladding glass melts passed out of contact with each other t... | 03/09/1999 |
| 5814122 | Method of making hollow high temperature ceramic superconducting fibers A hollow high temperature ceramic superconducting fiber (10, 100), a process for making the hollow fibers and an apparatus for carrying out the process are provided. The apparatus functions to simultaneously draw a molten superconducting material (16) and... | 09/29/1998 |
| 5810900 | Method and apparatus for delivering a cased glass stream A glass delivery system including a first forehearth having an orifice, a second forehearth having an orifice, a bottom pan assembly adapted to be positioned underneath the orifice of the first forehearth, and a glass delivery tube having an upper end ada... | 09/22/1998 |
| 5537505 | Transparent glass-ceramics The present invention is directed to the preparation of two groups of transparent glass-ceramics exhibiting high optical clarity and containing essentially only one crystal phase. The first group consists essentially, in cation percent, of _____... | 07/16/1996 |
| 4898603 | Method for manufacturing halide glass optical fiber A halide glass core fiber is clad by providing two melts that selectively join to form the molten clad fiber in a temperature range from 580° C. to 600° C. A separate heating means controls the fiber melt at the die nozzle. Because of the low viscosity ... | 02/06/1990 |
| 4897100 | Apparatus and process for fiberizing fluoride glasses using a double crucible and the compositions produced thereby A double crucible fiberizing apparatus and process for producing a continuous glass filament having a core fluoride-containing glass concentrically surrounded by a clad fluoride-containing glass at increased throughput speeds while simultaneously achievin... | 01/30/1990 |
| 4875917 | Method for making a layered glass article Layered glass products such as multilayer glass rods or fibers are formed in a preferably continuous process wherein at least two component glasses are supplied to an annular mixing zone wherein relative movement of the annular surfaces produces spiral la... | 10/24/1989 |
| 4784679 | Method for making a layered glass article Layered glass products such as multilayer glass rods or fibers are formed in a preferably continuous process wherein at least two component glasses are supplied to an annular mixing zone wherein relative movement of the annular surfaces produces spiral la... | 11/15/1988 |
| 4624692 | Apparatus for the continuous production of optical fibres The apparatus allows the continuous production of optical fibres (15) starting from liquid-phase reactants. They are injected into a pressurized vertical vessel (3), comprising a second coaxial vessel (4), which can be vertically displaced for the variati... | 11/25/1986 |
| 4578096 | Gradient index optical components An optical component having a gradient refractive index produced by multiple windings of a glass fiber over a glass mandrel. The fiber is provided with a refractive index gradation which varies from an approximate match with the mandrel to selected lower ... | 03/25/1986 |
| 4466818 | Double crucible method of fabricating optical fibers A method of fabricating an optical fiber by means of the double crucible method. A double crucible is used of which at least the inner crucible has a double-walled construction. The double wall accommodates a metal wire coil. During the fabrication of the... | 08/21/1984 |
| 4453962 | Method of manufacturing a flexible optical fiber bundle A number of three-layer optical fibers each having a core a cladding and an overcoating layer of acid-soluble glass material are bonded together by means of an adhesive which can be removed by applying heat. The bonded optical fibers are heated and stretc... | 06/12/1984 |
| 4452508 | Graded index optical fibres A range of alkali metal borosilicate glass compositions modified by the addition of alkaline earth metal oxides has been found to be especially suitable for the production of graded index optical fibre using the double crucible method. A core glass from t... | 06/05/1984 |
| 4439008 | Optical fiber of the graded index type and method of producing same An optical fiber of the graded index type consisting of a glass having predominantly the composition 60-70 mole % SiO2, 15-30 mole % alkali metal oxides, and 10 to 15 mole % MgO in combination with at least one oxide selected from the group for... | 03/27/1984 |
| 4410236 | Optical directional coupler and method of manufacture An interferometer with single-mode optical waveguide wound in a coil which waveguide has a surface at each end for the acceptance of light into the waveguide and for the display of light in the waveguide characterized by at least one polarizing filter bei... | 10/18/1983 |
| 4385916 | Method of producing an optical fiber having a core which has a noncircular cross-section, and double crucible for use in this method An optical fiber having a circular outer cross-section and having a core which has a noncircular cross-section is produced by using a double crucible. The outer crucible is provided with a ring-shaped channel of which at least one of the boundary walls ha... | 05/31/1983 |
| 4372648 | Optical fibres A secure optical fibre consists of an inner waveguiding structure surrounded by an outer waveguiding structure and separated therefrom by an optical absorbing layer (3) rendered absorbing by irradiation. The inner waveguiding structure comprises a core (1... | 02/08/1983 |
| 4351659 | Method for manufacture of graded index optical fibres A graded index optical fiber is produced in a double crucible with an elongate heated exit nozzle. The core and cladding glasses of the fiber diffuse into one another in the nozzle.... | 09/28/1982 |
| 4351658 | Manufacture of optical fibers A method of inexpensively forming low-loss optical waveguide fibers having high strength. A draw blank comprising a core region surrounded by a thin layer of cladding glass is formed by a CVD technique. The blank is drawn into a preliminary fiber which pa... | 09/28/1982 |
| 4299609 | Optical unit having a longitudinal side coupling zone An optical unit having at least one longitudinal side coupling zone characterized by the unit comprising at least one glass fiber having a glass core with a glass cladding layer surrounding the core with a step in the index of refraction from a greater to... | 11/10/1981 |
| 4289516 | Low loss optical fibers A method is provided for making an optical fiber by melting and cladding a multi-component core glass without adding the contamination that is normally associated with these processes. As an initial step, a pure multi-component glass is melted in a high p... | 09/15/1981 |
| 4275951 | Optical fibres and glasses A range of alkali metal borosilicate glass compositions modified by the addition of alkaline earth metal oxides has been found to be especially suitable for the production of graded index optical fibre by thermal diffusion using the double crucible method... | 06/30/1981 |
| 4259100 | Double crucible system for the production of light conducting fibers A double crucible system is disclosed for the production of light conducting fibers. The system has an interior crucible which can be axially displaced in relation to the exterior crucible which is concentric thereto. The spacing of the crucible jets in t... | 03/31/1981 |
| 4248614 | Method for drawing high-bandwidth optical waveguides In a method for directly drawing a glass optical waveguide or waveguide blank from two or more reservoirs of molten glass wherein a relatively high refractive index glass core member is clad with a relatively low refractive index glass cladding, control o... | 02/03/1981 |
| 4243296 | Optical unit having a longitudinal side coupling zone An optical unit having at least one longitudinal side coupling zone characterized by the unit comprising at least one glass fiber having a glass core with a glass cladding layer surrounding the core with a step in the index of refraction from a greater to... | 01/06/1981 |
| 4217123 | Double crucible method of optical fiber manufacture A method for forming optical fibres from a double crucible wherein one crucible supplies the core material and the other crucible supplies the cladding material. The two melts are supplied in a continuous process to insure a constant core to cladding diam... | 08/12/1980 |
| 4197136 | Optical transmission line glass and its method of manufacture Optical transmission line glass includes phosphorus pentoxide and germanium dioxide as the major glass forming oxides and gallium trioxide for waterproofing and refractive index control. A method of manufacture of such glass material utilizes a gas phase ... | 04/08/1980 |
| 4193782 | Device for drawing a group of cladded light conducting fibers A device for drawing a plurality of cladded light conducting fibers utilizing a double crucible having an inner crucible and an outer crucible with each of the crucibles having a bottom and receiving a melt of the respective material, and having nozzle pa... | 03/18/1980 |
| 4145200 | Production of optical glass fibers In a method for producing optical glass fibers which comprises co-spinning glass melts of different kinds through coaxially disposed discharge nozzles of a multimember crucible composed of two or more crucible members having a discharge nozzle at their bo... | 03/20/1979 |
