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| Number | Title | Issue Date |
| 7093465 | Method for heat treating synthetic quartz glass for optical use An object of the present invention is to overcome the problems of the prior art technique, and to provide a heat treatment method as well as a heat treatment apparatus capable of heat treating, with higher efficiency, a synthetic quartz glass for optical use having ... | 08/22/2006 |
| 6845636 | Apparatus for dehydrating and consolidating an optical fiber preform and method of the same A dehydration and consolidation furnace and a dehydration and consolidation method in which gas in a chamber does not leak to a furnace body room and gas in a furnace body room does not leak into a chamber is provided. A furnace of one embodiment of this invention h... | 01/25/2005 |
| 6672109 | Silica glass member, method for producing the same, and projection aligners using the same A silica glass member for use with a light having a specific wavelength of 250 nm or shorter, in which the difference in the maximum and the minimum values of hydroxyl group concentration as measured in a plurality of points within a plane vertical to an ... | 01/06/2004 |
| 6619073 | Method of increasing the initial transmittance of optical glass The invention relates to optical glass having improved initial transmittance, formed by subjecting the glass to a hydrogen and/or deuterium treatment at a temperature, and for a duration of time sufficient to diffuse the hydrogen and/or deuterium into the... | 09/16/2003 |
| 6588229 | Method for controlling heat treatment in process of fabricating high purity silica glass Disclosed is a method for controlling a heat treatment in the process of fabricating a high purity silica glass via a sol-gel process using a low temperature heater having an inhalation line and an exhaust line. Accordingly, the method includes the steps ... | 07/08/2003 |
| 6587262 | UV synthetic silica glass optical member and reduction projection exposure apparatus using the same This invention provides a synthetic silica glass optical member used together with light having a specific wavelength of 250 nm or less, in which the difference between the maximum value and the minimum value of transmittance [%/cm] per cm in thickness fo... | 07/01/2003 |
| 6578382 | Synthetic quartz glass for optical use, heat treatment method and heat treatment apparatus for the same A method for heat treating a synthetic quartz glass for optical use in a heating furnace, that comprises covering the surroundings of a synthetic quartz glass body with a SiO2 powder having a mean dissolved hydrogen molecule concentration of 1Ã... | 06/17/2003 |
| 6508084 | Method for producing optical quartz glass for excimer lasers and vertical-type heating furnace A method for producing an optical quartz glass for use in excimer lasers, comprising a step of forming a porous silica preform by depositing silica in a soot-like form formed by flame hydrolysis of a high-purity volatile silicon compound, followed by a st... | 01/21/2003 |
| 6374639 | Silica glass and its manufacturing method A method is provided for manufacturing a silica glass that is substantially free of chlorine. The method includes the step of separately expelling a silicon tetrafluoride gas, a combustion gas, and a combustible gas from a burner made of silica glass, the... | 04/23/2002 |
| 6266980 | Centerline protection using heavy inert gases Disclosed is a method of minimizing re-wetting of a preform upon removal of the preform from the consolidation furnace and producing core cane and/or optical fiber therefrom. During removal, the consolidated preform and, in particular, the centerline aper... | 07/31/2001 |
| 5922099 | Apparatus and method for fabricating tube-shaped glass monolith using sol-gel process There are provided tube-shaped glass monolith fabricating apparatus and method using a sol-gel process. In the tube-shaped glass monolith fabricating method using a tube-shaped glass monolith fabricating apparatus which has an upper mold including cylindr... | 07/13/1999 |
| 5837024 | Process for the production of quartz glass bodies An essentially cylindrical porous blank is formed by the deposition of SiO2 particles onto the lateral cylindrical surface of a cylindrical mandrel, rotating around its longitudinal axis; this blank is provided with a holding element of quartz ... | 11/17/1998 |
| 5779758 | Method and apparatus for forming continuous glass fibers An apparatus is provided for producing a glass fiber package. The apparatus includes a heated bushing for supplying streams of molten glass to be drawn into continuous fibers, a rotatable member adapted to draw the streams into fibers and to wind the fibe... | 07/14/1998 |
| 5735921 | Method of reducing laser-induced optical damage in silica The invention relates to the production of high purity fused silica glass which is highly resistant to 248 nm excimer laser-induced optical damage. In particular, this invention relates to a fused silica optical member or blank.... | 04/07/1998 |
| 5679125 | Method for producing silica glass for use with light in a vacuum ultraviolet wavelength range A method for producing a synthetic silica glass for use with vacuum ultraviolet light comprises the steps of: (a) producing a soot preform; (b) heating the soot preform in an atmosphere containing fluorine to obtain a fluorine-doped soot preform; (c) cons... | 10/21/1997 |
| 5626643 | Contact drying of fibers to form composite strands A method and apparatus are provided for producing composite strands. The apparatus comprises a heated bushing for supplying streams of molten glass to be drawn into continuous first fibers; a drawing device adapted to draw the streams into the first fiber... | 05/06/1997 |
| 5364428 | Method for producing glass preform for optical fiber A glass preform which is used for fabricating an optical fiber, has substantially no bubbles therein and contains sufficient amount of fluorine is produced by a method comprising steps of: forming a porous glass soot body from a glass-forming raw material... | 11/15/1994 |
| 5356447 | Manufacture of high proof-test optical fiber using sol-gel Incidence of breakage in optical fiber drawn from sol-gel produced preforms is reduced by treatment of the still-porous glass by use of a chlorine-containing, oxygen-free gas mixture. Improved satisfaction of proof-rest requirements to at least 100 kpsi i... | 10/18/1994 |
| 5326729 | Transparent quartz glass and process for its production Quartz glass obtained by flame-hydrolyzing a glass-forming raw material to obtain fine particles of quartz glass, having the fine particles of quartz glass deposited and grown on a substrate to obtain a porous quartz glass product and heating the porous q... | 07/05/1994 |
| 5325230 | Optical members and blanks of synthetic silica glass and method for their production The invention relates to lenses, prisms or other optical members which are subjected to high-power ultraviolet light having a wavelength of about 360 nm or less, or ionizing radiation, particularly optical members for use in laser exposure apparatus for l... | 06/28/1994 |
| 5318611 | Methods of making optical waveguides and waveguides made thereby Low attenuation, low dispersion of optical waveguides are provided by a process initiating with axial deposition of a high velocity core soot stream impinging on a target at a high angle of incidence relative to the axis of rotation of the target. A core ... | 06/07/1994 |
| 5269825 | Method of manufacturing radiation-resistant optical fiber A method of manufacturing a radiation-resistant optical fiber includes steps of a) heating a bare optical fiber to remove residual hydrogen gas present in the bare optical fiber and b) forming a coating layer consisting of a substance which does not allow... | 12/14/1993 |
| 5267343 | Enhanced radiation resistant fiber optics A process for producing an optical fiber having enhanced radiation resitance is provided, the process including maintaining an optical fiber within a hydrogen-containing atmosphere for sufficient time to yield a hydrogen-permeated optical fiber having an ... | 11/30/1993 |
| 5259856 | Method of producing glass preform in furnace for heating glass A heating furnace for heating a porous preform made of fine particles of quartz base glass for an optical fiber which comprises a heater and a muffle tube positioned inside the heater to separate a heating atmosphere from the heater, wherein the muffle tu... | 11/09/1993 |
| 5256178 | Method for producing an optical fiber of halide glass, particularly an infrared permeable fiber of heavy metal fluoride glass A method for manufacturing optical fibers from halide glass is provided. The method includes the steps of drawing a glass mass into a fiber in a dry gas atmosphere which contains a drying agent. In a further step of the process, an OH band which may still... | 10/26/1993 |
| 5226940 | Process for producing optical fibers of high tensile strength A process for producing optical fibers of high tensile strength, wherein the fiber is pulled from a glass mass of halide glass and includes surrounding the fiber and mass with a dry gas atmosphere containing a drying agent which reacts with moisture and t... | 07/13/1993 |
| 5221309 | Method for producing glass preform for optical fiber A method for producing a glass preform, which method comprises forming a soot preform of glass fine particles comprising SiO2 by flame hydrolysis or solution hydrolysis of a starting glass material and sintering the soot preform in an atmospher... | 06/22/1993 |
| 5211733 | Method for producing a high-purity silica glass powder A method for producing a high-purity silica glass powder by calcining a high purity silica gel powder, wherein a vertical-type moving bed apparatus equipped with a heating means is used in a moving bed system such that the feed silica gel powder is contin... | 05/18/1993 |
| 5207814 | Process for preparing monoliths of aerogels of metal oxides A process for the preparation of monoliths of aerogels of metal oxides, which aerogel is either constituted by one single oxide, or is constituted by a mixture of oxides, is disclosed, which process consists of the following operating steps: (a) the relev... | 05/04/1993 |
| 5203899 | Method for producing glass preform for optical fiber A glass preform which is used for fabricating an optical fiber, has substantially no bubbles therein and contains sufficient amount of fluorine is produced by a method comprising steps of: forming a porous glass soot body from a glass-forming raw material... | 04/20/1993 |
| 5201929 | Apparatus for producing flakes of glass A process for producing flakes of glass. The process is started by applying a solution containing an organic metal compound to a substrate. The solution is dried and peeled from the substrate. The resultant film is sintered. There is also disclosed an app... | 04/13/1993 |
| 5201920 | Method for producing an optical fiber of halide glass, particularly an infrared permeable fiber of fluoride glass A method for manufacturing optical fibers from halide glass is provided. The method includes the steps of drawing a glass mass into a fiber in a dry gas atmosphere which contains a drying agent. In a further step of the process, an OH band which may still... | 04/13/1993 |
| 5192351 | Production of dehydroxylated glass A substantially dehydroxylated glass is formed by impregnating a dry porous silica gel with a nitrogen-containing organic compound in an organic solvent capable of solubilizing that compound. The impregnated gel is then sintered in a non-oxidizing atmosph... | 03/09/1993 |
| 5180411 | Optical waveguide fiber with titania-silica outer cladding and method of manufacturing A method of making an optical waveguide fiber with a fatigue resistant TiO2 -SiO2 outer cladding, and a substantially glass blank for drawing into such fiber, wherein a glass soot TiO2 -SiO2 outermost layer, wit... | 01/19/1993 |
| 5174801 | Manufacture of quartz glass crucible for use in the manufacture of single crystal silicon A quartz glass crucible for use in a process for pulling a single crystal silicon and having an outer layer and an inner layer. The outer layer contains less than 0.3 ppm each of Na, K and Li and more thant 5 ppm of Al. The outer layer further contains bu... | 12/29/1992 |
| 5163987 | Method for producing glass preform for optical fiber A method for producing a glass preform for use in the fabrication of an optical fiber, which comprises adding fluorine to a soot preform in an atmosphere comprising a fluorine-coating compound at a temperature at which the soot preform is in the porous st... | 11/17/1992 |
| 5160362 | Process for manufacturing optical element In a process for manufacturing an optical element, in which a molding material is put in molds and is heated and press-molded to manufacture an optical element, a preheating treatment of the molding material is performed before it is put in the molds at a... | 11/03/1992 |
| 5152819 | Method of making fused silica This invention relates to the production of high purity fused silica glass through oxidation and/or flame hydrolysis of a halide-free, organosilicon-R compound in vapor form having the following properties: (a) producing a gas stream of a halide-free silicon-c... | 10/06/1992 |
| 5145510 | Silica glass powder and a method for its production and a silica glass body product made thereof A silica glass powder suitable for the production of a silica glass body product of a low silanol content, which is obtained by baking a dried silica gel powder obtained by a sol-gel method, at a temperature of from 1,000° to 1,400° C., wherein during t... | 09/08/1992 |
| 5145507 | Method for producing glass preform for optical fiber A glass preform is produced by forming a glass soot composite body having a core portion consisting of a solid glass and a peripheral portion consisting of a porous glass mass, removing trapped gas and water from pores of the soot composite body by heatin... | 09/08/1992 |
