Patents Represented by Attorney Stanley C. Corwin
  • Patent number: 5754005
    Abstract: An inlead for an electric lamp formed of an alloy of tungsten and molybdenum. The inlead has a rate of thermal expansion or contraction approximating that of the glass forming the bulb. This minimizes the expansion/contraction mis-match stress between the two materials. In addition, the alloy composition functions to reduce oxidation and degradation of the lead.
    Type: Grant
    Filed: October 29, 1993
    Date of Patent: May 19, 1998
    Assignee: General Electric Company
    Inventors: George E. Sakoske, Wayne A. Lasch, Joseph M. Ranish, Milan R. Vukcevich, Thomas H. Yu, Bernard W. Rachel, Richard G. Lynce, Istvan Meszaros, Gyorgy Nagy, Tamas Gal
  • Patent number: 5723937
    Abstract: A light-scattering coating comprising light-scattering particles, such as alumina, dispersed in a silica matrix is formed by applying to the filter a silicone solution in which is dispersed colloidal silica and the light-scattering particles to a suitable substrate and then pyrolyzing the dispersion at high temperature to drive off the organic components and form the silica matrix. This coating is hard and abrasion resistant and is useful for reflectors, lamps and lenses.
    Type: Grant
    Filed: March 22, 1993
    Date of Patent: March 3, 1998
    Assignee: General Electric Company
    Inventors: Pamela K. Whitman, Thomas G. Parham
  • Patent number: 5683949
    Abstract: A solid state method of converting a polycrystalline ceramic body to a single crystal body includes the steps of doping the polycrystalline ceramic material with a conversion-enhancing dopant and then heating the polycrystalline body at a selected temperature for a selected time sufficient to convert the polycrystalline body to a single crystal. The selected temperature is less than the melting temperature of the polycrystalline material and greater than about one-half the melting temperature of the material. In the conversion of polycrystalline alumina to single crystal alumina (sapphire), examples of conversion-enhancing dopants include cations having a +3 valence, such as chromium, gallium, and titanium.
    Type: Grant
    Filed: November 30, 1995
    Date of Patent: November 4, 1997
    Assignee: General Electric Company
    Inventors: Curtis Edward Scott, Mary Sue Kaliszewski, Lionel Monty Levinson
  • Patent number: 5670840
    Abstract: A tungsten-halogen lamp has a light transmissive, IR coated, filament chamber enclosing a filament, the filament chamber being enclosed within an outer envelope. Fuses are connected to opposite ends of the filament to limit the magnitude and duration of an electrical arc across a break in the filament which, in combination with a fill gas pressure of no greater than 2500 Torr reduces the likelihood of containment failure.
    Type: Grant
    Filed: November 12, 1992
    Date of Patent: September 23, 1997
    Inventors: Gustino J. Lanese, Frank E. Zalar, Ronald J. Olwert
  • Patent number: 5668433
    Abstract: An electrodeless fluorescent lamp comprises a sealed lamp vessel containing a fill capable of sustaining a discharge when suitably excited. The fill is excited by an RF electromagnetic field produced by a winding energized by an RF oscillator powered via a rectifier from the mains. To confine the RF field within the vessel a conductive coating FTO is provided inside the vessel. To at least reduce conducted interference a conductive coating A1 is provided on the outside of the vessel G. The coating A1 is electrically coupled (e.g., via 7) to RF ground which may be one side of the mains. An electrically insulative housing covers the coating A1. The housing which extends to a zone of maximum diameter of the vessel may grip the vessel.
    Type: Grant
    Filed: December 15, 1994
    Date of Patent: September 16, 1997
    Assignee: General Electric Company
    Inventors: Steven J. Everest, Basil Antonis
  • Patent number: 5631522
    Abstract: A glass composition, particularly well suited for use in constructing sodium containing lamp envelopes. The glass composition is comprised of silica doped with yttrium and/or cesium, preferably in combination aluminum.
    Type: Grant
    Filed: May 9, 1995
    Date of Patent: May 20, 1997
    Assignee: General Electric Company
    Inventors: Curtis E. Scott, Mohan Rajaram, Joseph A. Shrawder
  • Patent number: 5619096
    Abstract: A protective layer or precoat of a metal oxide for an internal conductive layer in a rapid-start fluorescent lamp is formed of yttria, ceria or silica to suppress the occurrence of localized appearance defects referred to as measles. The protective layer may be used in combination with conductive layers having a uniformly flat profile or a U-shaped bathtub profile to further enhance the suppression of measle defects. The lamp retains the desirable qualities of good startability and energy efficiency while at the same time avoiding the undesirable measle appearance defects.
    Type: Grant
    Filed: January 26, 1995
    Date of Patent: April 8, 1997
    Assignee: General Electric Company
    Inventors: Mary S. Kaliszewski, William E. Ishler
  • Patent number: 5602444
    Abstract: A fluorescent lamp with an ultraviolet reflecting barrier layer between the glass envelope and the phosphor layer(s). The barrier layer is a blend of gamma alumina and alpha alumina, preferably 5-80 weight percent gamma alumina and 20-95 weight percent alpha alumina. The barrier layer is effective to reflect UV light back into the phosphor layer(s), leading to improved phosphor utilization and more efficient production of visible light.
    Type: Grant
    Filed: August 28, 1995
    Date of Patent: February 11, 1997
    Assignee: General Electric Company
    Inventor: Jon B. Jansma
  • Patent number: 5588992
    Abstract: A solid state method of converting a polycrystalline ceramic body to a single crystal body includes the steps of doping the polycrystalline ceramic material with a conversion-enhancing dopant and then heating the polycrystalline body at a selected temperature for a selected time sufficient to convert the polycrystalline body to a single crystal. The selected temperature is less than the melting temperature of the polycrystalline material and greater than about one-half the melting temperature of the material. In the conversion of polycrystalline alumina to single crystal alumina (sapphire), examples of conversion-enhancing dopants include cations having a +3 valence, such as chromium, gallium, and titanium.
    Type: Grant
    Filed: November 3, 1995
    Date of Patent: December 31, 1996
    Assignee: General Electric Company
    Inventors: Curtis E. Scott, Mary Sue Kaliszewski, Lionel M. Levinson
  • Patent number: 5587626
    Abstract: An interference filter or coating is provided in a predetermined pattern on a lamp envelope. The coating is comprised of alternating layers of high and low index of refraction materials applied to a vitreous outer surface of a lamp envelope. The coating may be geometrically symmetric or asymmetric, continuous or discontinuous with respect to the coating itself or the envelope to which it has been applied. The envelope can be masked prior to deposition of the coating so that removal of the mask leaves the filter in the desired pattern. The preferred process for forming the coating includes forming a boric oxide mask on a portion of the envelope, applying the coating over the mask and removing the coating from masked areas of the envelope by dissolving the mask in an aqueous solution.
    Type: Grant
    Filed: December 27, 1995
    Date of Patent: December 24, 1996
    Assignee: General Electric Company
    Inventors: Thomas G. Parham, Frederick W. Dynys, Carl V. Gunter, John M. Davenport, Thomas M. Golz, Rolf S. Bergman, Frederic F. Ahlgren, Gary R. Allen, Mark E. Duffy, Richard L. Hansler
  • Patent number: 5569979
    Abstract: Fused quartz containing europium oxide, titanium dioxide and cerium oxide has been found to be effective for absorbing UV radiation while transmitting visible light radiation. Uses for this material include lamp envelopes and shrouds for halogen-incandescent lamps and metal halide arc discharge lamps which emit both UV and visible light radiation.
    Type: Grant
    Filed: September 26, 1994
    Date of Patent: October 29, 1996
    Assignee: General Electric Company
    Inventors: Curtis E. Scott, Cynthia A. Secen, Thomas G. Parham, Gary R. Allen, Robert L. Bateman, Jr., Paul G. Mathews
  • Patent number: 5569970
    Abstract: An optical interference filter produced on a vitreous, light transmissive substrate, such as an electric lamp envelope, includes a plurality of alternating layers of tantala and silica in which each tantala layer includes titania in an amount of less than about 10 mole % whereby the microstructure of the tantala layers is controlled during subsequent crystallization and extrinsic stress in the tantala layers is reduced. Rather than or in addition to including titania in each tantala layer, the present invention additionally contemplates placing at least some of the tantala layers in contact with a titania layer (pre-layer and/or post-layer) whereby the microstructure of the tantala layers is controlled during subsequent crystallization and extrinsic stress in the tantala layers is reduced.
    Type: Grant
    Filed: March 23, 1995
    Date of Patent: October 29, 1996
    Assignee: General Electric Company
    Inventors: Frederick W. Dynys, Thomas G. Parham
  • Patent number: 5567031
    Abstract: A centralized lighting system is provided having a high intensity light source which is disposed at approximately the first optical focal point of an ellipsoidally shaped reflector member. A mirror member, disposed in advance of a second optical focal point associated with the reflector member, receives light output from the light source and is constructed so as to divide the light output into at least first and second beam portions. The mirror member is further effective so as to separate the first and second beam portions by at least 90 degrees relative to one another. Corresponding at least first and second optical transmission members are receptive of the first and second beam portions and are effective for communicating the light output to locations remote from the light source. In one embodiment, the mirror member is V-shaped and is constructed of first and second mirror segments joined together so as to form an angle of less than about 85 degrees therebetween.
    Type: Grant
    Filed: October 20, 1993
    Date of Patent: October 22, 1996
    Assignee: General Electric Company
    Inventors: John M. Davenport, Richard L. Hansler, William J. Cassarly
  • Patent number: 5563977
    Abstract: A display system having a greyscale control arrangement for controlling light output from a plurality of optical fibers includes a light source effective for supplying a high brightness light output to the input ends of the plurality of optical fibers. A plurality of piezoelectric shutter members are disposed adjacent the light delivery ends of the optical fibers and are effective for controlling the delivery of light output through the optical fibers as a function of the on or off condition thereof. The delivery ends of the optical fibers are disposed relative to one another so as to form a plurality of display pixels. At least two of the optical fibers are combined to form each of the pixels. The diameters of the at least two optical fibers that make up each pixel are different thereby allowing that at least four different greyscale levels can be achieved for each display pixel.
    Type: Grant
    Filed: May 24, 1995
    Date of Patent: October 8, 1996
    Assignee: General Electric Company
    Inventors: William J. Cassarly, John M. Davenport, Richard L. Hansler, Jean-Pierre Vanderreydt, Allen Miller
  • Patent number: 5560699
    Abstract: A central lighting system for providing light to locations remote from the light source includes first and second ellipsoidally shaped reflector members joined so as to substantially surround the light source. The reflector members collect the light output and focus it onto an input face of either a light guide or a non-imaging optical coupling member. If the optical coupling member is utilized, an angle to area conversion occurs so as to allow light introduced at high angles to an input face of the optical coupler to exit the optical coupler at a smaller angle. The reflector members can also be configured so that respective second optical focal points can reside at the apex of the opposing reflector member thereby allowing for a coupling efficiency of approximately 70% or greater.
    Type: Grant
    Filed: September 2, 1993
    Date of Patent: October 1, 1996
    Assignees: General Electric Company, Ford Motor Company
    Inventors: John M. Davenport, Richard L. Hansler, William J. Cassarly, Mahendra S. Dassanayake, Jeffrey A. Erion, John X. Li
  • Patent number: 5552671
    Abstract: The subject invention, therefore, relates to a multi-layer coating for use on a thick-walled metal halide lamp which emits visible light radiation and absorbs and reflects UV radiation, and which further manages the thermal non-uniformity problems across the thickness of the arc tube to substantially eliminate devitrification problems.
    Type: Grant
    Filed: February 14, 1995
    Date of Patent: September 3, 1996
    Assignee: General Electric Company
    Inventors: Thomas G. Parham, Robert L. Bateman, Gary R. Allen, John M. Davenport
  • Patent number: 5549746
    Abstract: A solid state seed crystal process for bulk conversion of a polycrystalline ceramic body to a single crystal body (of the same chemical composition) having the same crystal orientation as the seed crystal. The process comprises heating said body to form a monolithic join between the body and the seed crystal, heating the joined structure to reduce grain growth inhibitors and further heating the joined structure above the minimum temperature required for crystallite growth of the crystalline material, but not hot enough to melt and distort the original shape of the polycrystalline ceramic body during its conversion to a single crystal. This process has been used to convert polycrystalline alumina (PCA) bodies to sapphire having the same crystal orientation as the seed crystal by heating the PCA body, monolithically joined to a sapphire seed crystal, at a temperature above 1700.degree. C. without melting the body.
    Type: Grant
    Filed: September 24, 1993
    Date of Patent: August 27, 1996
    Assignee: General Electric Company
    Inventors: Curtis E. Scott, Jack M. Strok, Lionel M. Levinson
  • Patent number: 5542857
    Abstract: A lamp assembly comprises a lamp having a plurality of terminal pins projecting from a base, and a lamp holder having terminal contacts for engaging the pins. The lamp is first located in the holder by inserting the pins into respective openings in a base of the holder, and the lamp is then rotated relative to the holder to bring a portion of each pin into contact with a respective terminal contact of the holder.
    Type: Grant
    Filed: December 6, 1993
    Date of Patent: August 6, 1996
    Assignee: General Electric Company
    Inventors: Roger A. Hume, Richard A. Felstead, Douglas G. L. Lee, Lawrence C. Barling, Anthony J. Barrell
  • Patent number: 5540182
    Abstract: A solid step process for convening a polycrystalline body to a single crystal body includes the steps of forming a selected surface topography on the body and then heating the body at a temperature below its melting temperature for a time sufficient to substantially convert the polycrystalline material to single crystal material. The surface topography includes depressions or protrusions from the body having sidewalls of the polycrystalline material that are disposed to intersect one another at junctions forming relatively sharp corners, and the dimensions of the sidewalls are greater than the average grain size of the polycrystalline material. Typically alumina is the polycrystalline material and surface features include grooves or the like. The patterned alumina body with the selected surface topography is heated to a temperature between 1800.degree. and 2000.degree. C. in one or more cycles to convert the polycrystalline alumina to sapphire.
    Type: Grant
    Filed: September 24, 1993
    Date of Patent: July 30, 1996
    Assignee: General Electric Company
    Inventors: Lionel M. Levinson, Curtis E. Scott
  • Patent number: 5539276
    Abstract: A fluorescent lamp produces light having color coordinates within an ellipse (A) about 22 standard deviation of color matching around the color coordinates (b)x=0.344 y=0.302. The luminescent layer of the lamp includes a mixture of: magnesium fluorogermanate activated by manganese as red emitter; calcium halophosphate as white emitter; and a blue emitter preferably strontium pyrophosphate activated by divalent tin. The layer may alternatively be a mixture of red emitting magnesium fluorogermanate and blue emitting barium titanium pyrophosphate. Other blue emitters are also described.
    Type: Grant
    Filed: May 13, 1994
    Date of Patent: July 23, 1996
    Assignees: General Electric Company, Interpet Limited
    Inventors: Adrian J. Exell, Milroy G. Abeywickrama, Martin P. A. Baines