Class 65/420 - Maintaining isotropic conditions inside of tube

Subclass of Class 65 - Glass manufacturing
Definition: Processes wherein an environment is sustained that causes
No. of patents: 28
Last issue date: 05/13/2008

Number	Title	Issue Date
7373066	Optical waveguide device and multiple optical waveguide device In a multiple optical waveguide device, a transparent plate is bonded or joined on the top surface of a clad with which optical circuits and quartz glass substrates are covered, and optical reflection film is provided on the fringing area or the whole area of a join...	05/13/2008
7085451	Optical fiber gratings with azimuthal refractive index perturbation The present invention relates to a type of optical fiber grating having an azimuthal refractive-index perturbation. The optical fiber includes a fiber grating that has a plurality of grating elements formed therein. At least one of the grating elements has a spatial...	08/01/2006
7080528	Method of forming a phosphorus doped optical core using a PECVD process Embodiments of the present invention provide a highly uniform low cost production worthy solution for manufacturing low propagation loss optical waveguides on a substrate. In one embodiment, the present invention provides a method of forming a PSG optical waveguide ...	07/25/2006
7069749	Method of manufacturing a solid preform The present invention relates to a method of manufacturing a solid preform by moving a heat source parallel to the longitudinal axis of a substrate tube, whose inner surface is coated with one or more doped or undoped glass layers, so as to collapse the substrate tu...	07/04/2006
6430967	Pressure monitoring system using disposable seals A pressure monitoring system for use in monitoring gas pressure within a rotating tube has a chemical delivery tube which projects into the rotating tube and whose distal end is sealed to the interior wall of the tube. A coaxial tube surrounds the deliver...	08/13/2002
6301936	Apparatus for manufacturing porous glass preform The object of the invention is to provide an apparatus for manufacturing a porous glass preform, which comprises a reaction vessel in which local stress concentration caused by expansion due to heat is prevented, and there is no fear of the occurrence of ...	10/16/2001
6220060	Optical fiber manufacture The specification describes a process and apparatus for collapsing preform tubes in Modified Chemical Vapor Deposition processes. The problem of bubble formation during tube collapse was found to be attributable to excess dopant vapor pressure emitted fro...	04/24/2001
6109065	Method of making optical waveguide devices using perchloryl fluoride to make soot Applicants have determined that much of the nonuniformity in solution doped preforms is due to nonuniformity of the soot layer caused by the high temperature necessary for complete reaction, and that MCVD fabrication using reaction temperature lowering ga...	08/29/2000
6105396	Method of making a large MCVD single mode fiber preform by varying internal pressure to control preform straightness A large optical preform 303 is made by a modified chemical vapor deposition (MCVD) process by depositing successive layers of core and cladding materials onto the inside surface of a rotating glass tube 33 having a hydroxyl ion (OH-) level that...	08/22/2000
5993899	Optical fiber preform and its fabrication process A process of fabricating an optical fiber preform, preferably a multimode optical fiber preform, having a maximum refractive index along an axis of the fiber and a lower refractive index at its periphery. The process includes the following steps: depositi...	11/30/1999
4952225	Method of making an internally-doped tube of transparent glass, in particular for manufacturing rare-earth-doped optical fibers A mist is formed by an ultrasonic generator (5) from a liquid solution containing a dopant, and the mist is inserted into the tube blank to be doped (4) by means of a flexible pipe (2) in order to deposit microdrops on the inside surface of said tube blan...	08/28/1990
4932990	Methods of making optical fiber and products produced thereby An improved multimode optical fiber having substantially higher bandwidth and lower loss is made by controlling process parameters such as the volume of the silica which is deposited in each pass of a torch assembly (41) along a substrate tube (31) to for...	06/12/1990
4909816	Optical fiber fabrication and resulting product A preform for fabrication of a glass fiber optical transmission line is prepared by chemical reaction of vapor ingredients within a glass tube. Reaction, which may be between chlorides or hydrides of, for example, silicon and germanium with oxygen, occurs...	03/20/1990
4826288	Method for fabricating optical fibers having cores with high rare earth content A chemical vapor deposition method which utilizes a rare earth chelate vapor as a source of rare earth ions for producing an optical fiber having a core with a high rare earth content....	05/02/1989
4797143	Process for the production of optical fiber preforms An improved process for the production of optical fiber porous preforms of predetermined refractive index distribution by the vapor-phase deposition method is disclosed wherein a glass material and a dopant material are subjected to flame oxidation by the...	01/10/1989
4659353	Method of making birefringent optical fibers The method uses a raw-material and dopant-deposition technique, which requires vapor-state reactants and thermal sources for producing a temperature gradient suited to obtain a circularly and radially varying refractive-index profile in the supporting tub...	04/21/1987
4608070	Process for manufacturing optical-fibre preforms at high deposition rate The process allows a uniform layer of glass particles, forming the preform, to be deposited on the internal wall of a supporting tube rotated around its axis. A suitable relationship is provided to determine the temperature distribution in the deposition ...	08/26/1986
4504299	Optical fiber fabrication method A preform for fabrication of a glass fiber optical transmission line is prepared by chemical reaction of vapor ingredients within a glass tube. Reaction, which may be between chlorides or hydrides of, for example, silicon and germanium with oxygen, occurs...	03/12/1985
4425146	Method of making glass waveguide for optical circuit Halides of Si and Ti, B, P, or Ge and oxygen or steam are introduced into a reaction vessel and heated in a vapor phase to form fine glass particles by oxidation or hydrolysis. The fine glass particles are deposited on a substrate. The deposited fine glas...	01/10/1984
4328017	Method and apparatus for making optical fiber waveguides A glass optical waveguide preform is prepared by chemical reaction of vapor ingredients within a bait tube. As the reactants flow through the bait tube, a hot zone traverses the tube to cause the deposition of soot in a section of the tube downstream of t...	05/04/1982
4328018	Method and apparatus for making optical fiber waveguides A glass optical fiber waveguide preform is prepared by chemical reaction of vapor ingredients within a bait tube. As the reactants flow through the bait tube, a hot zone traverses the tube to cause the deposition of soot in a section of the tube just down...	05/04/1982
4320230	Methanol homologation using iron-cobalt carbonyl cluster catalyst A homogeneous catalytic process for the selective conversion of methanol to ethanol or acetaldehyde. The process comprises contacting CO and H2 with a catalytically effective amount of an iron-cobalt carbonyl complex of the formula M[FeCo3...	03/16/1982
4312653	Process for the production of a coated glass body A process for the production of coated glass bodies in which a glass layer is provided by a cycle including applying a glass forming material on a surface of a rotating body and transforming the glass forming material into the glass layer by locally heati...	01/26/1982
4276072	Optical fiber fabrication High purity glass preforms for optical fiber manufacture are provided by depositing, using chemical vapor deposition techniques, high purity materials upon a removable hollow tubular deposition substrate of a radio frequency energy susceptible material. T...	06/30/1981
4263032	Method of making optical fibers utilizing thermophoretic deposition of glass precursor particulates The deposition of glass precursor particulates, during optical fiber fabrication, is rendered more efficient by increasing the thermal forces which play a significant role in directing the particulate material to an appropriate substrate. Specific embodim...	04/21/1981
4194807	Optical fiber wave-guides for signal transmission comprising multiple component glass with an adjusted expansion co-efficient between the core and mantle The present invention discloses an optical fiber wave-guide for signal transmission in which the signal fiber has a linear thermal expansion co-efficient in all of the fiber elements above 15×10-7 /°C. in which the outer mantle is composed of...	03/25/1980
3982916	Method for forming optical fiber preform A process for manufacturing preforms from which clad optical fibers having longitudinal, eccentric, azimuthal index inhomogeneities may be drawn. In one embodiment, the known CVD process for making preforms is modified by the use of asymmetric heating to ...	09/28/1976
3980459	Method for manufacturing optical fibers having eccentric longitudinal index inhomogeneity In a chemical vapor deposition (CVD) process for manufacturing a fiber optic preform, a glass rod is inserted into the preform during the deposition of the core layer. This yields a fiber having a longitudinal eccentric index inhomogeneity which is close ...	09/14/1976

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Class 65/420 - Maintaining isotropic conditions inside of tube