Patents by Inventor Judith A. Ladd

Judith A. Ladd 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).

  • Publication number: 20010055454
    Abstract: A light-emitting fiber comprises an optical fiber having a number of light-emitting elements disposed along the length of one surface thereof. The light-emitting elements include a hole injecting electrode on which a patterned insulation layer is disposed having openings defining pixel areas. An electro-luminescent material, such as an OLED material, is disposed at least on such pixel areas and a segmented electron injecting electrode on the OLED layer. The hole injecting electrodes are connected together by an electrical conductor disposed on a side surface of the optical fiber. Electrical contacts connect to the electron injecting electrode and are disposed, at least in part, so as to overlie transverse portions of the insulation layer.
    Type: Application
    Filed: May 16, 2001
    Publication date: December 27, 2001
    Inventors: William R. Roach, Judith A. Ladd, Grzegorz Kaganowicz, Daniel J. Szostak
  • Publication number: 20010055458
    Abstract: A light-emitting display comprises a sheet having a number of light-emitting elements disposed along the length of raised features on one surface thereof. The light-emitting elements include a patterned hole injecting electrode, an electro-luminescent material, such as an OLED material, and a patterned electron injecting electrode, deposited on the sheet. Ones of the hole injecting electrodes are connected together by electrical conductors disposed in elongated recesses between the raised features on the one surface. Electrical contacts connect to the electron injecting electrode and may be segments thereon or may be strips disposed transverse to the elongated recesses.
    Type: Application
    Filed: June 12, 2001
    Publication date: December 27, 2001
    Inventor: Judith A. Ladd
  • Patent number: 5196580
    Abstract: A method is disclosed for recovering oxalate from oxalate containing solutions containing complexes of iron and chromium. The method involves adjusting the pH of the solution to from about 1 to 2, adding calcium chloride in an amount equal to at least about 3 moles per mole of iron, and digesting the resulting calcium chloride treated solution at at least about 50.degree. C. for a sufficient time to form a solid consisting esssentially of calcium oxalate, followed by separating the solid from the resulting mother liquor.
    Type: Grant
    Filed: October 17, 1988
    Date of Patent: March 23, 1993
    Assignee: GTE Products Corporation
    Inventors: Judith A. Ladd, Michael J. Miller
  • Patent number: 4966760
    Abstract: A method for recovering chromium from chromium-bearing material which comprises heating the material which can contain any one or combination of Co, Ni, Fe, Mo, and W with solid alkali metal hydroxide in an oxidizing atmosphere at 600.degree. C.-1000.degree. C. to form a fused material containing water soluble compounds of Cr, Mo, and W contained therein. The fused material is cooled and contacted with water to form a leach solution and a residue. The leach solution is adjusted to a pH of from about 5-8 with sulfuric acid, and a water soluble calcium salt is added. The chromium-rich liquor is then adjusted to a pH of 1-3 with sulfuric acid. Sodium metabisulfite is added to the chromium-rich liquor to reduce the chromium to the trivalent state after which the pH is adjusted to 5-8 with a base to form a precipitate of essentially all of the chromium.
    Type: Grant
    Filed: September 5, 1989
    Date of Patent: October 30, 1990
    Inventors: Judith A. Ladd, Joseph E. Ritsko
  • Patent number: 4840775
    Abstract: A method is disclosed for purifying cobaltic hydroxide of sodium and chloride which involves firing the cobaltic hydroxide at a temperature of from about 180.degree. C. to about 850.degree. C. to remove essentially all of the water and to release sodium from the crystal matrix of the cobaltic hydroxide, slurrying the dried cobaltic hydroxide in a deionized water solution which contains a sufficient amount of an ionic compound to prevent the peptization of the cobaltic hydroxide, to solublize essentially all of the chloride and a greater portion of the sodium than would otherwise be solubilized without the firing step, and removing the purified cobaltic hydroxide from the resulting liquor.
    Type: Grant
    Filed: October 13, 1987
    Date of Patent: June 20, 1989
    Assignee: GTE Products Corporation
    Inventors: Eric F. Husted, Judith A. Ladd
  • Patent number: 4808384
    Abstract: A process is disclosed for recovering tungsten, iron, and manganese from tungsten bearing material. The process involves digesting the material in a sufficient amount of sulfuric acid at a temperature of at least about 80.degree. C. for a sufficient time in the presence of coal as a reducing agent to form a digestion solution containing the major portion of the scandium, iron, and manganese and a digestion residue containing the major portion of the tungsten, followed by separating the solution from the residue. The major portion of the scandium can be extracted from the digestion solution with an organic solution consisting essentially of a mixture of tertiary alkyl primary amines which are present in an amount sufficient to extract the major portion of the scandium, and the balance an essentially aromatic solvent. The scandium is stripped from the organic with hydrochloric acid which is then separated from the stripped organic.
    Type: Grant
    Filed: December 21, 1987
    Date of Patent: February 28, 1989
    Assignee: GTE Products Corporation
    Inventors: Clarence D. Vanderpool, Judith A. Ladd, Martin B. MacInnis, Mary A. Fedorchak
  • Patent number: 4798708
    Abstract: A process is disclosed for recovering metals from chromium bearing material comprising one or more or the metals of cobalt, nickel, molybdenum, tungsten, iron, tin, aluminum. The process comprises atomizing the material to produce a flowable powder which is then fused in an oxidizing atmosphere with sufficient alkali metal hydroxide at a temperature sufficient to form a nonmagnetic fused material in which the chromium, tungsten and molybdenum are present as water soluble salts. The resulting fused material is then slurried with a sufficient amount of water to dissolve the water soluble compounds. The pH is adjusted to from about 9.2 to about 9.6 with an acid to allow insolubles to form which contain any cobalt, and nickel and the major portion of any iron, tin and aluminum followed by separating the insolubles from the resulting first liquor.
    Type: Grant
    Filed: February 16, 1988
    Date of Patent: January 17, 1989
    Assignee: GTE Products Corporation
    Inventors: Judith A. Ladd, Michael J. Miller
  • Patent number: 4718996
    Abstract: A process is disclosed for recovering tungsten, scandium, iron, and manganese from tungsten bearing material. The process involves digesting the material in sufficient sulfuric acid at a sufficient temperature for a sufficient time in the presence of a reducing agent to form a digestion solution containing the major portion of the scandium, iron, and manganese, and a digestion residue containing the major portion of the tungsten, separating the digestion solution from the digestion residue and extracting essentially all of the scandium from the solution with an organic consisting essentially of an extracting agent which is a dialkyl phosphoric acid which is present in an amount sufficient to extract essentially all of the scandium without extracting appreciable amounts of iron and manganese, and the balance an essentially aromatic solvent.
    Type: Grant
    Filed: September 4, 1986
    Date of Patent: January 12, 1988
    Assignee: GTE Products Corporation
    Inventors: Clarence D. Vanderpool, Martin B. McInnis, Judith A. Ladd
  • Patent number: 4718995
    Abstract: A process is disclosed for recovering scandium from a tungsten bearing material containing tungsten, iron manganese and scandium. The process involves digesting the material in an aqueous solution selected from the group consisting of a saturated solution of sulfur dioxide and a sulfuric acid solution containing an additional reducing agent at a sufficient temperature for a sufficient time to form a digestion solution containing the major portion of the scandium, iron, and manganese, and a digestion solid containing the major portion of the tungsten which is separated from the digestion solution. The major portion of the scandium is extracted from the digestion solution with an organic consisting essentially of an extracting agent which is essentially a mixture of alkyl primary amines which are present in an amount sufficient to extract the major portion of the scandium without extracting appreciable amounts of iron and manganese, and the balance an essentially aromatic solvent.
    Type: Grant
    Filed: September 5, 1986
    Date of Patent: January 12, 1988
    Assignee: GTE Products Corporation
    Inventors: Clarence D. Vanderpool, Martin B. MacInnis, Judith A. Ladd
  • Patent number: 4684401
    Abstract: A chromium-cobalt alloy fine powder is disclosed which consists essentially of spheres with the chromium and cobalt being relatively uniformly distributed throughout the particles of the powder. The process for producing the powder is disclosed. The process involves firing a relatively uniform admixture consisting essentially of anhydrous cobalt (II) chloride and chromium (III) chloride in a furnace in a hydrogen atmosphere at a first temperature of at least about 400.degree. C. and below the sublimation temperature of chromium (III) chloride for a time sufficient to reduce essentially all of the cobalt (II) chloride to cobalt metal and to reduce essentially all of the chromium (III) chloride to chromium (II) chloride. The temperature is elevated to a second temperature of at least about 750.degree. C. and below the sublimation temperature of chromium (II) chloride. The elevation is done by raising the temperature in increments of about 100.degree. C.
    Type: Grant
    Filed: May 12, 1986
    Date of Patent: August 4, 1987
    Assignee: GTE Products Corporation
    Inventors: Judith A. Ladd, Clarence D. Vanderpool
  • Patent number: 4668483
    Abstract: A process is disclosed for recovering chromium from a chromium bearing material containing cobalt, molybdenum, and tungsten. The process involves roasting the material and alkali metal compound at a temperature of at least about 400.degree. C. for a sufficient time to react the alkali metal compound with the material and form a reacted mixture containing essentially all of the chromium, molybdenum, and tungsten as alkali salts. The reacted mixture is water leached to dissolve the alkali salts and form a leach solution containing essentially all of the chromium, molybdenum, and tungsten, and a leach solid containing essentially all of the cobalt. After separation of the leach solution from the leach solid, the pH of the leach solution is adjusted to from about 0.5 to about 3.0 with an acid and a sufficient amount of a reducing agent is added to reduce essentially all of the chromium to the trivalent state.
    Type: Grant
    Filed: May 12, 1986
    Date of Patent: May 26, 1987
    Assignee: GTE Products Corporation
    Inventors: Judith A. Ladd, Clarence D. Vanderpool
  • Patent number: 4626280
    Abstract: A process is disclosed for recovering tungsten, iron, and manganese from tungsten bearing material. The process involves digesting the material in a sulfur dioxide solution at a sufficient temperature for a sufficient time to form a digestion solution containing the major portion of the scandium, iron, and manganese, and a digestion solid containing the major portion of the tungsten which is separated from the digestion solution. The major portion of the scandium is extracted from the digestion solution with an organic consisting essentially of an extracting agent which is essentially a mixture of alkyl primary amines which are present in an amount sufficient to extract the major portion of the scandium without extracting appreciable amounts of iron and manganese, and the balance an essentially aromatic solvent. After separation of the scandium containing organic from the raffinate, the organic is stripped of the scandium with hydrochloric acid which is then separated from the stripped organic.
    Type: Grant
    Filed: January 24, 1986
    Date of Patent: December 2, 1986
    Assignee: GTE Products Corporation
    Inventors: Clarence D. Vanderpool, Martin B. MacInnis, Judith A. Ladd
  • Patent number: 4624703
    Abstract: A process is disclosed for recovering tungsten, scandium, iron, and manganese from tungsten bearing material. The process involves digesting the material in sufficient sulfuric acid at a sufficient temperature for a sufficient time in the presence of a reducing agent to form a digestion solution containing the major portion of the scandium, iron, and manganese, and a digestion residue containing the major portion of the tungsten, separating the digestion solution from the digestion residue and extracting essentially all of the scandium from the solution with an organic consisting essentially of an extracting agent which is a dialkyl phosphoric acid which is present in an amount sufficient to extract essentially all of the scandium without extracting appreciable amounts of iron and manganese, and the balance an essentially aromatic solvent.
    Type: Grant
    Filed: January 24, 1986
    Date of Patent: November 25, 1986
    Assignee: GTE Products Corporation
    Inventors: Clarence D. Vanderpool, Martin B. MacInnis, Judith A. Ladd