Patents by Inventor Pamela K. Whitman
Pamela K. Whitman has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 5944572Abstract: A low pressure mercury vapor discharge lamp is provided, having a non-straight glass envelope and a plurality of rare earth phosphor layers coated inside the glass envelope. The lamp is made by coating a plurality of rare earth phosphor layers inside a straight glass tube. The tube is then formed into a non-straight configuration, each layer being sufficiently thin so that the phosphor coating does not flake off in sections where the tube is bent around a radius of curvature. A plurality of thin rare earth phosphor layers will not flake off in the bent section whereas a single thick rare earth phosphor layer will flake off. The invention is particularly useful in the manufacture of helical compact fluorescent lamps.Type: GrantFiled: October 24, 1997Date of Patent: August 31, 1999Assignee: General Electric CompanyInventors: Thomas F. Soules, Pamela K. Whitman, Daniel R. Chirayath
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Patent number: 5917291Abstract: An electrodeless fluorescent reflector lamp includes a housing arrangement having a threaded screw base for receiving line power and a lamp envelope mounted on the housing arrangement. A ballast circuit is disposed within the housing arrangement and is effective for converting line power into an RF signal which excites a fill contained within the lamp envelope to a discharge state thereby resulting in the production of visible light. The lamp envelope is constructed having an upper curved face portion and a lower tapered portion which extends partly within the housing. A reflective coating is applied to the lower tapered portion of the lamp envelope. A phosphor coating distribution is applied to the interior surface of the lamp envelope in a manner so as to maximize the light output from the reflector lamp.Type: GrantFiled: May 13, 1997Date of Patent: June 29, 1999Assignee: General Electric CompanyInventors: Thomas F. Soules, Judit Szigeti, Gabor Sajo, Pamela K. Whitman, Laszlo Balazs
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Patent number: 5731659Abstract: A low pressure mercury vapor discharge lamp is provided, having a non-straight glass envelope and a plurality of rare earth phosphor layers coated inside the glass envelope. The lamp is made by coating a plurality of rare earth phosphor layers inside a straight glass tube. The tube is then formed into a non-straight configuration, each layer being sufficiently thin so that the phosphor coating does not flake off in sections where the tube is bent around a radius of curvature. A plurality of thin rare earth phosphor layers will not flake off in the bent section whereas a single thick rare earth phosphor layer will flake off. The invention is particularly useful in the manufacture of helical compact fluorescent lamps.Type: GrantFiled: May 13, 1996Date of Patent: March 24, 1998Assignee: General Electric CompanyInventors: Thomas F. Soules, Pamela K. Whitman, Daniel R. Chirayath
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Patent number: 5723937Abstract: 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: GrantFiled: March 22, 1993Date of Patent: March 3, 1998Assignee: General Electric CompanyInventors: Pamela K. Whitman, Thomas G. Parham
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Patent number: 5680005Abstract: A compact fluorescent lamp is provided in a coiled or helical configuration in order to maximize the length of discharge tubing for a given height. A non-uniform coating of phosphor is provided on the interior surface of the discharge envelope to inhibit light otherwise directed inwardly into the lamp toward a longitudinal axis of the helical configuration and redirect the light outwardly through an outer circumferential portion having a thinner phosphor coating. This results in increased light output for an given lamp geometry and lamp power.Type: GrantFiled: March 31, 1995Date of Patent: October 21, 1997Assignee: General Electric CompanyInventors: Thomas F. Soules, Pamela K. Whitman, Jennifer I. Barry
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Patent number: 5627426Abstract: Incandescent lamps or arc lamps having an infrared red reflecting multilayer optical interference filter on the outer surface of the vitreous or fused quartz lamp envelope enclosing the filament have a light-scattering coating applied over the filter to scatter light emitted by the lamp and thereby diffuse the filament image. The light-scattering coating consists of light-scattering particles, such as alumina, dispersed in a silica matrix. This coating is formed by applying to the filter a silicone solution in which is dispersed colloidal silica and light-scattering particles and pyrolyzing at high temperature to drive off the organic components and form the silica matrix.Type: GrantFiled: March 22, 1993Date of Patent: May 6, 1997Assignee: General Electric CompanyInventors: Pamela K. Whitman, Thomas G. Parham, Thomas M. Sharda
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Patent number: 5578892Abstract: An electric lamp is provided having a quartz envelope and a light source capable of generating light within the envelope. Disposed on a surface of the envelope is a filter which absorbs a portion of the light emitted by the light source to produce light output poorly seen by insects. The filter includes a blue absorbing pigment in a vitreous glassy silica binder derived from a coating precursor comprising a liquid dispersion of colloidal silica in a silicone. The blue absorbing pigment is preferably a praseodymium doped zircon or an antimony doped nickel titanate. Preferably, the filter also includes a precoat of ultra-fine titania to improve the reduction of ultraviolet radiation.Type: GrantFiled: March 13, 1995Date of Patent: November 26, 1996Assignee: General Electric CompanyInventors: Pamela K. Whitman, Thomas G. Parham
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Patent number: 5536991Abstract: An electric lamp, such as an incandescent linear quartz heat lamp, is provided having a vitreous light transmissive envelope having an exterior surface and a light source capable of generating light within said envelope. Disposed on a portion of the exterior surface of the envelope is a diffuse reflective coating, such as a boron nitride coating, for reflecting at least a portion of the light emitted by the source. A protective silica coating encapsulates the reflective coating to protect the reflective coating from things such as abrasion, moisture, and cleaning solvents.Type: GrantFiled: September 13, 1994Date of Patent: July 16, 1996Assignee: General Electric CompanyInventors: Thomas G. Parham, Leonard E. Hoegler, Pamela K. Whitman
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Patent number: 5391959Abstract: Yttrium-containing phosphors can be stabilized for use in an aqueous slurry containing a binder, which slurry can be used for coating fluorescent lamps by treating with ammonium dihydrogen phosphate and ammonium hydrogen difluoride to inactivate free yttrium ions. The resulting aqueous slurry is stable and provides coated fluorescent lamps having uniform coatings that are bright and long lasting.Type: GrantFiled: April 30, 1993Date of Patent: February 21, 1995Assignee: General Electric CompanyInventors: Mohamed E. Labib, Henry Wielicki, deceased, Pamela K. Whitman
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Patent number: 5268614Abstract: Yttrium-containing phosphors can be stabilized for use in an aqueous slurry containing a binder, which slurry can be used for coating fluorescent lamps by treating with ammonium dihydrogen phosphate and ammonium hydrogen difluoride to inactivate free yttrium ions. The resulting aqueous slurry is stable and provides coated fluorescent lamps having uniform coatings that are bright and long lasting.Type: GrantFiled: June 30, 1992Date of Patent: December 7, 1993Assignee: General Electric CompanyInventors: Mohamed E. Labib, Henry Wielicki, deceased, by Edward A. Wielicki, executor, by Joanna Wielicki, executrix, Pamela K. Whitman
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Patent number: 5258689Abstract: Fluorescent lamps having a tin oxide layer protected by a layer of colloidal alumina having a median particle diameter below 0.4 micron exhibit an objectionable pearlescent coloration if the alumina layer thickness is within the range of 500-8,000 .ANG.. This coloration is reduced to an acceptable level by incorporating from 10-30 wt. % of particulate alumina having a median diameter above 0.75 micron in the colloidal alumina.Type: GrantFiled: December 11, 1991Date of Patent: November 2, 1993Assignee: General Electric CompanyInventors: Jon B. Jansma, Thomas G. Parham, Pamela K. Whitman