Patents by Inventor Romano G. Pappalardo
Romano G. Pappalardo 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: 6137217Abstract: A fluorescent lamp comprises at least one layer of a four-component phosphor blend for producing visible illumination having a white color. The quad-phosphor blend comprising a first and second red-emitting phosphor component with each red-emitting phosphor component having different visible emission spectrum principally in the 590 to 630 nm wavelength range. A third blue-emitting phosphor component has an emission spectrum principally in the 430 to 490 nm wavelength range. A fourth no-rare-earth green-emitting phosphor component has an emission spectrum principally in the 500 to 570 nm wavelength range. The relative proportions of the phosphor components are such that an enhanced color rendering index is produced as compared to tri-component blends formed from only three of the phosphor components.Type: GrantFiled: August 28, 1992Date of Patent: October 24, 2000Assignee: GTE Products CorporationInventors: Romano G. Pappalardo, Roger B. Hunt, Jr.
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Patent number: 5854533Abstract: A fluorescent lamp comprises a plurality of metameric blends of lamp phosphors for converting ultraviolet radiation to visible illumination.Type: GrantFiled: October 19, 1992Date of Patent: December 29, 1998Assignee: GTE Products CorporationInventor: Romano G. Pappalardo
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Patent number: 5838101Abstract: A fluorescent lamp has a coating on the interior surface of the glass envelope comprising an alkaline earth metal halophosphate phosphor and a quad-phosphor blend wherein the combination of phosphors result in a predetermined color point from about 2700 to about 4200 K on or near the Planckian locus where the alkaline earth metal halophosphate phosphor comprises a blend of halophosphate phosphors having a color temperature substantially matching the color temperature of the quad-blend which includes an europium activated aluminate as a phosphor component.Type: GrantFiled: October 28, 1992Date of Patent: November 17, 1998Assignee: GTE Products CorporationInventor: Romano G. Pappalardo
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Patent number: 5524016Abstract: A host acting as an optical emitter and a process of making the same for the .sup..about. 1.3 .mu.m to .sup..about. 1.55 .mu.m spectral region utilized in optical communications is disclosed. The host is Cr-activated willemite (Zn.sub.2 SiO.sub.4). Efficient band-emission at room temperature, with peak at 1.42 .mu.m, is observed on exiting the material in the near infrared, typically at 730 nm and 829 nm.Type: GrantFiled: June 9, 1994Date of Patent: June 4, 1996Assignee: GTE Laboratories IncorporatedInventors: Romano G. Pappalardo, Thomas E. Peters, Karen Lee, William J. Miniscalco
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Patent number: 4979893Abstract: The lumen maintenance of fluorescent lamps containing yttrium vanadate phosphors is markedly improved by the presence of a protective oxide layer for the phosphor. The protective oxide layer is produced by evaporating aluminum isopropoxide, in a vacuum, over phorphor particles forming a continuous aluminum isopropoxide over the phosphor particles. The isopropoxide coating is subsequently oxidized by lehring the phosphor at a temperature from about 500.degree. C. to 625.degree. C. forming an alumina coating on the phosphor particles.Type: GrantFiled: February 21, 1989Date of Patent: December 25, 1990Assignee: GTE Laboratories IncorporatedInventors: Romano G. Pappalardo, Thomas E. Peters, Roger B. Hunt, Jr.
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Patent number: 4952422Abstract: A fluorescent lamp containing a Y.sub.2 O.sub.3 or Al.sub.2 O.sub.3 coating on a layer of yttrium vanadate phosphor and a method of coating the layer of the yttrium vanadate phosphor with a continuous protective coating of Y.sub.2 O.sub.3 or Al.sub.2 O.sub.3 is described. The method comprises applying a coating of a metal, such as yttrium or aluminum, on the yttrium vanadate phosphor then lehring the metallic coating at about 500.degree. C. to about 625.degree. C. to form a continuous protective coating of Y.sub.2 O.sub.3 or Al.sub.2 O.sub.3 overlaying the layer of phosphor.Type: GrantFiled: February 29, 1988Date of Patent: August 28, 1990Assignee: GTE Laboratories IncorporatedInventors: Romano G. Pappalardo, Thomas E. Peters, Roger B. Hunt, Jr.
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Patent number: 4772417Abstract: The present invention is directed to luminescent materials having the general formula:Ca(2-v-w-x-y-z) (NSF).sub.v Sr.sub.w Cd.sub.x Sn.sub.y Mn.sub.z P.sub.2 O.sub.7wherein:NSF is the non-stoicheometric factor;0.ltoreq.v.ltoreq.0.010.ltoreq.w.ltoreq.0.08;0.ltoreq.x.ltoreq.0.05;0.01.ltoreq.y.ltoreq.0.03; and0.05.ltoreq.z.ltoreq.0.15.Type: GrantFiled: December 21, 1984Date of Patent: September 20, 1988Assignee: GTE Laboratories IncorporatedInventors: Romano G. Pappalardo, Thomas E. Peters
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Patent number: 4757233Abstract: The present invention is directed to phosphors exhibiting efficient, narrow band UV emission, with peak emission at 330 nm (from excitation at 254). These phosphors are cerium-activated calcium pyrophosphate (beta-phase) of nominal formulationCa(.sub.2-w-x-y) (NSF).sub.w Ce.sub.x Na.sub.y P.sub.2 O.sub.7wherein:NSF is the non-stoicheometric factor;0.ltoreq.w.ltoreq.0.1;0.05.ltoreq.x.ltoreq.0.20; and0.05.ltoreq.y.ltoreq.0.20.Type: GrantFiled: December 21, 1984Date of Patent: July 12, 1988Assignee: GTE Laboratories Inc.Inventors: Thomas E. Peters, Romano G. Pappalardo, Alexandre Vetrovs
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Patent number: 4749513Abstract: An efficient green emitting phosphor results from the coactivation of yttrium fluoride with gadolinium and erbium. The excitation energy absorbed by the Gd.sup.3+ centers is transferred non-radiatively to minority Er.sup.3+ centers, whose emission produces green light when excited by 275 nanometer or 378 nanometer radiation.Type: GrantFiled: October 2, 1987Date of Patent: June 7, 1988Assignee: GTE Laboratories IncorporatedInventors: John Collins, Romano G. Pappalardo, Baldassare Di Bartolo, Thomas E. Peters
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Patent number: 4647399Abstract: Yellow emitting fluorescent lamp phosphor compositions comprise cerium and manganese activated alkali-earth fluoroapatite compositions containing sodium having the approximate formula(Ca.sub.1-s Sr.sub.s).sub.t Ce.sub.v Na.sub.w Mn.sub.x (PO.sub.4).sub.y F.sub.zwhereins is from 0 to 1t is from about 3.43 to about 4.01v is about 0.3w is about 0.3x is from about 0.3 to about 0.4y is about 3.00z is from about 1.0 to about 4.0.An improved two step firing process for producing the disclosed phosphors is described and an improved fluorescent lamp employing the disclosed phosphors is also described.Type: GrantFiled: April 30, 1986Date of Patent: March 3, 1987Assignee: GTE Laboratories IncorporatedInventors: Thomas E. Peters, Romano G. Pappalardo
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Patent number: 4594178Abstract: Yellow emitting fluorescent lamp phosphors comprise cerium and manganese activated calcium-strontium fluoroapatite compositions represented by the approximate formula(Ca.sub.1-t Sr.sub.t).sub.v Ce.sub.w Mn.sub.x (PO.sub.4).sub.y F.sub.zwhereint is from 0 to 1v is from about 4.12 to about 4.30w is about 0.295x is from about 0.147 to about 0.295y is about 3.0z is from about 1.72 to about 2.21.An improved two step firing process for producing the disclosed phosphors is described and an improved fluorescent lamp employing the disclosed phosphors is also described.Type: GrantFiled: March 18, 1985Date of Patent: June 10, 1986Assignee: GTE Laboratories IncorporatedInventors: Romano G. Pappalardo, John Walsh
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Patent number: 4446049Abstract: Phosphors and a method for producing yellow-emitting tin-manganese coactivated calcium fluorophosphate phosphors having improved brightness comprises the steps of blending a powder mixture including the phosphates, carbonates, fluorides and oxides of calcium, tin, and manganese together with an ammonium salt, and firing the mixture at a temperature of between about 1100.degree. C. and about 1300.degree. C. for a period sufficient to produce a luminescent composition. The presence of an ammonium compound in the initial powder blend promotes the proper atmosphere during the firing step to insure the incorporation of proper levels of tin and manganese ions in the final phosphor.Type: GrantFiled: October 21, 1982Date of Patent: May 1, 1984Assignee: GTE Laboratories IncorporatedInventors: Romano G. Pappalardo, Thomas E. Peters
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Patent number: 4307321Abstract: A luminescent phosphor composition having enhanced luminescent decay lifetime consists essentially of a non-stoichiometric cerium and manganese coactivated alkaline earth orthophosphate represented by the formulaSr.sub.(3-v-w-x-y-z) .quadrature..sub.v Mg.sub.w CA.sub.x (PO.sub.4).sub.2 :Ce.sub.y Mn.sub.zwhere0.001.ltoreq.v.ltoreq.0.050.180.ltoreq.w.ltoreq.0.350.ltoreq.x.ltoreq.0.080.015.ltoreq.y.ltoreq.0.050.01.ltoreq.z.ltoreq.0.10.An improved fluorescent lamp employing the disclosed phosphor is also described.Type: GrantFiled: March 31, 1980Date of Patent: December 22, 1981Assignee: GTE Laboratories IncorporatedInventors: Romano G. Pappalardo, John Walsh
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Patent number: 4306173Abstract: A luminescent phosphor composition having enhanced luminescent decay lifetime consists essentially of a non-stoichiometric tin and manganese coactivated alkaline earth orthophosphate represented by the formulaSr.sub.(3-v-w-x-y-z) .quadrature..sub.v Mg.sub.w Ca.sub.x (PO.sub.2).sub.4 :Sn.sub.y Mn.sub.zwhere0.001.ltoreq.v.ltoreq.0.050.180.ltoreq.w.ltoreq.0.350.ltoreq.x.ltoreq.0.080.015.ltoreq.y.ltoreq.0.050.0005.ltoreq.z.ltoreq.0.0905.An improved fluorescent lamp employing the disclosed phosphor is also described.Type: GrantFiled: March 31, 1980Date of Patent: December 15, 1981Assignees: GTE Laboratories Inc., GTE Products CorporationInventors: Romano G. Pappalardo, Charles F. Chenot
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Patent number: 4134851Abstract: A luminescent glass comprising a host material consisting essentially of 25 to 36 mole percent Al.sub.2 O.sub.3, the balance P.sub.2 O.sub.5, and which is doped with cerium and terbium. The glass is an efficient emitter of visible radiation, predominantly green, when excited by ultraviolet radiation.Type: GrantFiled: September 16, 1977Date of Patent: January 16, 1979Assignee: GTE Laboratories IncorporatedInventors: Richard M. Klein, William F. Nelson, Romano G. Pappalardo, Leslie A. Riseberg