Patents Represented by Attorney L. Greenspan
  • Patent number: 4115720
    Abstract: Electronic device comprising an evacuated envelope containing a main thermionic cathode heated solely by energetic electrons emitted from an unheated auxiliary field-emission cathode.
    Type: Grant
    Filed: March 31, 1977
    Date of Patent: September 19, 1978
    Assignee: RCA Corporation
    Inventor: Jules David Levine
  • Patent number: 4109177
    Abstract: A cathode-ray tube with either a positive-or a negative tolerance viewing-screen structure comprises an evacuated envelope, a luminescent viewing screen within the envelope and means for exciting the screen to luminescence. The tube includes means, such as an apertured mask or a light-absorbing matrix, for selectively defining to the viewer an array of discrete excited areas in the screen which are noncircularly graded in size, with the largest areas in the central portion of the screen and the smallest areas in the peripheral portions of the screen.
    Type: Grant
    Filed: July 22, 1971
    Date of Patent: August 22, 1978
    Assignee: RCA Corporation
    Inventors: Richard Hugh Godfrey, Albert Maxwell Morrell
  • Patent number: 4091144
    Abstract: A substrate, such as a ceramic body, carries a layer of glaze consisting essentially of (a) an inorganic oxide glass matrix that is essentially free from ions which migrate in a high-electric field, (b) about 1 .times. 10.sup.19 to 50 .times. 10.sup.19 antimony cations distributed in each cubic centimeter of the glass matrix, and (c) about 4 to 30 weight percent with respect to the weight of said glaze of discrete tin-oxide particles in the antimony-containing glass matrix. The method comprises dissolving antimony, as a compound thereof, in a glass, mixing together particles of said glass and tin-oxide particles, coating the mixture on a substrate, heating the coated substrate to melt the glass particles while retaining tin oxide in discrete particulate form, and then solidifying the molten coating.
    Type: Grant
    Filed: May 24, 1976
    Date of Patent: May 23, 1978
    Assignee: RCA Corporation
    Inventors: Joseph Dresner, Kenneth Warren Hang
  • Patent number: 4089687
    Abstract: Method comprises (a) applying to a supporting surface a coating comprised of a photosensitizable water-soluble polymer, a soluble dichromate photosensitizer for the polymer, a soluble vanadate, and particles of the pattern material; (b) exposing the coating to a pattern of actinic radiation until exposed portions of the coating are rendered insoluble; (c) and flushing the exposed coating with an aqueous solvent to remove soluble portions of the coating, while retaining the insoluble portions of the coating in place.
    Type: Grant
    Filed: October 11, 1973
    Date of Patent: May 16, 1978
    Assignee: RCA Corporation
    Inventor: Stanley Arthur Harper
  • Patent number: 4078095
    Abstract: Method comprises heating the viewing window of a cathode-ray tube to temperatures above 35.degree. C, dispensing from a storage container onto a surface of said window a quantity of slurry comprised of particulate material mixed with a liquid vehicle, the quantity of slurry being in excess of that required to coat said surface, spreading the quantity of slurry over the surface whereby the slurry is heated by the window, collecting the excess slurry from the surface and returning it to the storage container, and removing the heat transferred to the excess slurry from the window.
    Type: Grant
    Filed: March 28, 1974
    Date of Patent: March 7, 1978
    Assignee: RCA Corporation
    Inventor: John Michael Ratay
  • Patent number: 4076426
    Abstract: In inspecting a cathode-ray-tube window having a light-scattering inner surface, a pattern, which approximates the structure of the video images to be viewed through the window, is placed close to or against the inner surface. The pattern is observed through the window, and those local regions where the pattern appears to be distorted are identified.
    Type: Grant
    Filed: June 29, 1976
    Date of Patent: February 28, 1978
    Assignee: RCA Corporation
    Inventors: Harvey Andrew Gross, Harry Robert Frey, John David Messner, Raymond Frederick Walters
  • Patent number: 4071426
    Abstract: A cermet film includes metal particles in an insulator with the metal particles having an average diameter of from about 30A to about 120A. The cermet film has a high resistivity, and low temperature coefficient of resistivity, and is stable under electric fields of up to 10.sup.5 volts/cm. The cermet film can be formed by co-sputtering the metal and the insulator onto a substrate. The sputtered cermet film is then annealed in a reducing atmosphere whereby its resistivity is increased without a corresponding change in its temperature coefficient of resistivity.
    Type: Grant
    Filed: November 26, 1976
    Date of Patent: January 31, 1978
    Assignee: RCA Corporation
    Inventors: Harry Louis Pinch, Benjamin Abeles, Jonathan Isaac Gittleman
  • Patent number: 4061529
    Abstract: The method comprises applying to a surface to be etched a coating of a liquid composition comprising an acid-precipitated casein, alkali dichromate photosensitizer, sodium borate and water. The layer is dried, photoexposed, developed and baked to produce an etch-resistant stencil.
    Type: Grant
    Filed: February 28, 1977
    Date of Patent: December 6, 1977
    Assignee: RCA Corporation
    Inventors: Abraham Goldman, Pabitra Datta
  • Patent number: 4058875
    Abstract: Prior to mounting the mask in its prescribed position spaced from the inner surface of the panel, the panel surface is coated with a film of an organic material to improve the resistance of that surface to abrasion and bruising. The film is volatilizable when heated in air at temperatures up to about 400.degree. C so that it is easily removable by baking.
    Type: Grant
    Filed: August 18, 1976
    Date of Patent: November 22, 1977
    Assignee: RCA Corporation
    Inventors: Jawdat Ibrahim Nubani, Walter Robert Rysz
  • Patent number: 4049845
    Abstract: Method comprises adsorbing colloidal particles of a latex onto phosphor particles, providing filter particles in a liquid medium, optionally adsorbing colloidal particles of a latex onto the filter particles and combining the phosphor particles and filter particles into a single mixture. The foregoing steps, which are conducted in aqueous media, may be carried out in any order. Thereafter, the combined mixture of phosphor particles with adsorbed colloidal particles thereon and filter particles is coagulated while in an aqueous medium.
    Type: Grant
    Filed: March 8, 1976
    Date of Patent: September 20, 1977
    Assignee: RCA Corporation
    Inventors: Gerald Scott Lozier, Phyllis Brown Branin
  • Patent number: 4049452
    Abstract: In the method disclosed, a supporting surface, such as the inner surface of the faceplate of the tube, is coated with a photosensitive polymeric film containing about 5 to 80 weight percent of at least one member of the group consisting of certain diol ethers and diol alkanes. Then the film is exposed to a light image to produce regions of greater solubility and regions of lesser solubility. The film regions of greater solubility are removed, and then the entire faceplate with its regions of less solubility is overcoated with a layer containing particles of screen structure material. The retained film regions and the overcoating thereon are removed leaving the screen structure adherent in the areas of greater solubility. By including a diol ether or diol alkane in the film, the exposure time may be shortened significantly without substantial loss of adherence.
    Type: Grant
    Filed: April 23, 1975
    Date of Patent: September 20, 1977
    Assignee: RCA Corporation
    Inventor: Edith Mayaud Nekut
  • Patent number: 4045849
    Abstract: A cathode-ray tube comprises a getter container supported on a metal spring which is attached to and extends from the electron-gun mount assembly. At least a portion of the spring consists of an alloy, such as 55-nitinol (an alloy of nickel and titanium), which can be thermally set to a first shape, then cold formed to a second shape, and then restores itself to the first shape upon being heated above a predetermined transition temperature. The method includes providing a spring which has been thermally set and then cold formed, attaching the container to the spring and the spring to the mount assembly, sealing the container and the mount assembly in the tube, and then heating the spring above the predetermined transition temperature.
    Type: Grant
    Filed: October 21, 1976
    Date of Patent: September 6, 1977
    Assignee: RCA Corporation
    Inventor: Earle Solomon Thall
  • Patent number: 4041347
    Abstract: A cathode-ray tube having a conductive internal coating comprised of carbon, optionally iron oxide, lithium silicate and at least one of sodium and potassium silicates on the interior walls of the tube.
    Type: Grant
    Filed: September 22, 1975
    Date of Patent: August 9, 1977
    Assignee: RCA Corporation
    Inventors: Samuel Broughton Deal, Donald Walter Bartch
  • Patent number: 4031597
    Abstract: During mount sealing, prior to sliding the mount assembly into the glass neck of a cathode-ray tube, the inner surface of the neck is coated with a film of volatilizable, organic material. Then, the mount assembly is slid into position and sealed in the neck. After sealing, the film is volatilized. Preferably, the film is thin, and the material is volatilizable when heated in air at temperatures below about 400.degree. C, so that it is easily removable by baking in the usual tube-making processes.
    Type: Grant
    Filed: September 22, 1976
    Date of Patent: June 28, 1977
    Assignee: RCA Corporation
    Inventors: Jawdat Ibrahim Nubani, Walter Robert Rysz
  • Patent number: 4027192
    Abstract: The device comprises an electroluminescent layer and means for exciting the electroluminescent layer to luminescence with an electric field. The electroluminescent layer comprises a cathodoluminescent phosphor normally having a bulk resistivity greater than 10.sup.11 ohm-centimeters containing a sufficient quantity of indium oxide and/or tin oxide therein to produce a bulk resistivity of less than 10.sup.10 ohm-centimeters in the electroluminescent layer. The preferred electroluminescent layers are red emitting solid solutions of yttrium oxide, europium oxide, and indium oxide which are prepared by radio frequency sputtering.
    Type: Grant
    Filed: July 18, 1975
    Date of Patent: May 31, 1977
    Assignee: RCA Corporation
    Inventor: Joseph John Hanak
  • Patent number: 4025661
    Abstract: An aluminized luminescent viewing-screen structure for a cathode-ray tube includes a carbon particle layer in contact with the aluminum layer. The carbon-particle layer is substantially free from metal-ion-containing materials, particularly compounds of alkali and alkaline earth metals.A viewing-screen structure comprising a light-reflective aluminum metal layer having a carbon-particle layer thereon may be made by: (a) depositing on the metal layer a coating of organic, volatilizable, film-forming material, (b) depositing on the coated metal layer an over-coating of carbon particles that is substantially free from substances which, when incinerated, produce metal-ion-containing residues and (c) then baking the screen and support in air at about 400.degree. to 450.degree. C to remove organic and volatile matter.
    Type: Grant
    Filed: November 13, 1972
    Date of Patent: May 24, 1977
    Assignee: RCA Corporation
    Inventors: John Joseph Moscony, Joseph John Piascinski
  • Patent number: 4024069
    Abstract: Phosphors consisting essentially of a host material having a face-centered cubic crystal structure and the empirical formula YTa.sub.3 O.sub.9 or Y.sub.3 TaO.sub.7 wherein 0.01 to 0.10 mol percent of the Y is replaced with at least one trivalent activator cation. A portion of the Y up to 20 mol percent may also be replaced with at least one trivalent nonactivator cation, such as Gd, La and Lu. The phosphors may be excited with ultraviolet light, x-rays or cathode rays to emit in the visible and ultraviolet regions of the spectrum depending on the excitation and the activator cations present.
    Type: Grant
    Filed: July 16, 1975
    Date of Patent: May 17, 1977
    Assignee: RCA Corporation
    Inventor: Simon Larach
  • Patent number: 4021588
    Abstract: Method comprises dispersing phosphor particles in a liquid medium and then precipitating filter material on the phosphor particles. The filter-covered phosphor particles are removed from the medium, dried and then heated until the filter material sinters to the surfaces of the phosphor particles as discrete filter particles.
    Type: Grant
    Filed: January 23, 1976
    Date of Patent: May 3, 1977
    Assignee: RCA Corporation
    Inventors: Martin Robert Royce, Robert Paul Thompson
  • Patent number: RE29203
    Abstract: Method comprises applying a portion of initial slurry to a first substrate, spreading the initial slurry on the substrate, removing the excess slurry from the substrate, preparing a reconstituted slurry comprised of the removed excess slurry and a makeup slurry, and then dispensing a portion of reconstituted slurry onto a second substrate. As compared to the initial slurry, the makeup slurry has at least one of (1) a larger proportion of large particles, (2) a larger proportion of phosphor, (3) a greater binder/water ratio and (4) a smaller photosensitizer/binder ratio..Iaddend.
    Type: Grant
    Filed: August 23, 1976
    Date of Patent: May 3, 1977
    Assignee: RCA Corporation
    Inventor: Phyllis Brown Branin
  • Patent number: RE29662
    Abstract: A family of cathodoluminescent phosphors which consist essentially of oxy-chalcogenides of lanthanum and/or lutetium containing, for each mol of phosphor, between 0.0002 and 0.2 mol of dysprosium, erbium, europium, holmium, neodymium, praseodymium, samarium, terbium, or thulium. Up to 15 mol percent of the lanthanum and lutetium may be replaced with yttrium or gadolinium. The phosphors may be prepared by reacting the constituent elements as compounds thereof at temperatures between 900 and 1300.degree. C. for 0.2 to 5.0 hours and then cooling the reaction product.
    Type: Grant
    Filed: April 4, 1977
    Date of Patent: June 6, 1978
    Assignee: RCA Corporation
    Inventor: Perry Niel Yocom