Patents Represented by Attorney Max Geldin
  • Patent number: 5618606
    Abstract: A process for producing a fiber reinforced, staged resin composite or repair patch containing a staged and cobonded adhesive, comprises providing a composite or patch formed of one or more layers of a fiber reinforced thermosetting resin such as a graphite-epoxy material and applying a layer of a thermosetting resin adhesive, e.g. an epoxy adhesive, to a surface of the fiber reinforced resin material. The arrangement is then placed in a vacuum environment such as a nonautoclave tool, to draw off volatiles from the resin, and the temperature is raised under conditions to stage the thermosetting resin of the adhesive and of the composite or patch, and cobonding the staged adhesive to the staged composite or patch. The resulting cobonded and staged composite-adhesive can be stored until ready for use, e.g. in repairing a damaged substrate.
    Type: Grant
    Filed: September 18, 1989
    Date of Patent: April 8, 1997
    Assignee: Rockwell International Corporation
    Inventors: George O. Sherrick, Robert A. Susnik
  • Patent number: 5401573
    Abstract: A metal substrate such as aluminum or an alloy thereof having an ultraviolet sensitive thermal control coating on the substrate such as an anodic coating or a white thermal control paint coating, and an ultraviolet degradation protective coating on the thermal control coating. The ultraviolet degradation protective coating can be an ultraviolet absorber such as quartz or an ultraviolet reflector such as aluminum oxide.
    Type: Grant
    Filed: November 30, 1992
    Date of Patent: March 28, 1995
    Assignee: McDonnell Douglas Corporation
    Inventors: Henry W. Babel, Mark M. Hasegawa, Steven A. Daneman
  • Patent number: 5393610
    Abstract: A method for stabilizing shelf life conductivity of conductive coatings such as polypyrrole or nickel sulfide on a substrate such as fiberglass, by incorporating in such conductive coating a polyphenol or a polysiloxane. The polyphenol is derived from a phenolic material in the form of a phenol-formaldehyde monomer or an oligomer of phenol-formaldehyde, and the polysiloxane is derived from a siloxane. Upon heating, the phenolic material cures to a polyphenol and the siloxane is converted to a polysiloxane, forming the stabilizing material on the conductive polypyrrole or nickel sulfide coated substrate. The phenolic material is preferably incorporated directly into the solution formulation for preparing the conductive nickel sulfide or polypyrrole on the substrate, and the polyphenol stabilizer is formed together with the conductive coating on the substrate by heating.
    Type: Grant
    Filed: February 5, 1993
    Date of Patent: February 28, 1995
    Assignee: Rockwell International Corporation
    Inventors: Edward F. Witucki, William P. Moran, Patricia H. Cunningham, Lyle V. Monney
  • Patent number: 5393604
    Abstract: Production of silica "green" tapes employed in fabrication of multilayer circuit boards, by mixing silica powder comprised of spherical substantially uniform particles ranging in size from 0.1 to 2 microns, e.g., 0.7 micron, with a liquid medium containing a vinyl acetate--acrylic copolymer emulsion as binder, polyethylene glycol as plasticizer and dispersant, and preferably also including a small amount of boron, in the form of boric acid or boric oxide. The resulting slip is cast on a substrate, such as a polyester tape and dried to produce a crack-free tape. The resulting silica " green" tape is cut into individual tapes, a predetermined circuit pattern is screened onto each tape, preferably employing gold or copper conductors, and the polyester backing is removed from the tapes. The screened silica "green" tapes are then collated and registered to form a stack of layers, and the layers are laminated under pressure and at elevated temperature into a monolithic unit.
    Type: Grant
    Filed: January 28, 1988
    Date of Patent: February 28, 1995
    Assignee: McDonnell Douglas Corporation
    Inventor: Lloyd E. Sanchez
  • Patent number: 5390090
    Abstract: A lamp in the shape of a brick and adapted for placement between bricks in a driveway or on roads, having an outer case, an electric bulb housing mounted in the case, a bulb socket supported on the bulb housing and a translucent lens formed of a high strength plastic mounted on the top of the bulb housing. In a preferred embodiment the unit comprised of the bulb housing and lens is removably mounted in the case by means of latching members, e.g. in the form of elongated screws attached to such unit and having lower threaded ends, and resilient blocks mounted adjacent the inside walls of the outer case and a threaded member, e.g. a nut, positioned in the resilient blocks for receiving the lower ends of the screws for locking or releasing such unit to remove same from the case replacing a bulb in the bulb socket or for cleaning the screws in combination with the resilient blocks permit expansion and contraction of the bulb housing-lens unit while in locked position.
    Type: Grant
    Filed: September 2, 1992
    Date of Patent: February 14, 1995
    Inventor: Larry J. Nau
  • Patent number: 5389302
    Abstract: A chemiluminescent dye penetrant composition is provided for detecting cracks and other defects in the surface of an object, which comprises a carrier, preferably in the form of a nonionic surfactant, a small amount of a fluorescent dye soluble in the surfactant and a minor amount of hydrogen peroxide. The dye penetrant is applied to the surface of the object and excess dye penetrant is removed therefrom. An oxalate ester or oxalate amide is then applied to the treated surface and reacts with the dye penetrant in the cracks and defects to luminesce, and produces self illuminated penetrant indications at the location of the cracks and defects. Oxalate esters such as bis(2,4,6 trichlorophenyl) oxalate are preferred. The oxalate ester or oxalate amide can be mixed with inert conventional developer materials such as talc or fumed silica.
    Type: Grant
    Filed: October 4, 1993
    Date of Patent: February 14, 1995
    Assignee: Rockwell International Corporation
    Inventor: Leslie F. Warren, Jr.
  • Patent number: 5366787
    Abstract: The structure and process for making a metallic panel structure from a plurality, e.g. two, core elements each comprised of a pair of sheets of superplastic material welded together along a plurality of weld lines, the weld lines of one core element being spaced differently or of different shape from the weld lines of the other core element. The core elements are joined together, with the weld lines of one core panel positioned at an angle, e.g., normal, to the weld lines of the adjacent core element. The resulting panel assembly is placed in a die. The die is heated to superplastic forming temperature, and gas pressure is applied to the spaces between the sheets of the respective core elements, causing superplastic forming and expansion of the sheets of each core panel to form a first series of bulges between weld lines of one core element, and a second series of bulges dissimilar in shape, e.g.
    Type: Grant
    Filed: October 22, 1992
    Date of Patent: November 22, 1994
    Assignee: McDonnell Douglas Corporation
    Inventors: Ken K. Yasui, Richard G. Pettit
  • Patent number: 5361483
    Abstract: A composite fastener, preferably in the form of a rivet, which comprises a shank having a first head integrally formed on one end thereof, the shank and head formed of a high temperature thermoplastic matrix material selected from the group consisting of a polyether ether ketone resin and a polyamide imide resin, and having continuous reinforcing fibers, such as graphite fibers, axially oriented in substantially parallel relation throughout the shank, the fibers being flared and extending continuously into the head and substantially evenly flared and swaged therein, thereby forming a fastener having high shear and high tensile characteristics.
    Type: Grant
    Filed: November 19, 1991
    Date of Patent: November 8, 1994
    Assignee: Rockwell International Corp.
    Inventors: Gilles A. Rainville, Leonardo Israeli
  • Patent number: 5338433
    Abstract: Process for simultaneous electrodeposition of at least a two component alloy system of cobalt and chromium on a substrate, by providing an aqueous solution of divalent cobalt and trivalent chromium ions and containing ethylenediaminetetraacetic acid, at a pH of about 3 to about 5, electrolyzing the solution in an electrolyte cell containing an anode and a cathode, and codepositing cobalt and chromium on the cathode, e.g. titanium, as substrate. According to a preferred embodiment molybdenum-containing ions are also added to the electrolyte, resulting in codeposition of an alloy of cobalt, chromium and molybdenum. In another embodiment, a calcium phosphate ceramic such as hydroxyapatite (HA)is added to the above electrolyte solution, resulting, e.g. , in a codeposit of the calcium phosphate material, e.g. HA, and an alloy of cobalt, chromium and molybdenum.
    Type: Grant
    Filed: June 17, 1993
    Date of Patent: August 16, 1994
    Assignee: McDonnell Douglas Corporation
    Inventors: George W. Maybee, Timothy E. Taylor, Elmer L. Field, Clyde Riley, William R. Lacefield, Jr., Harold D. Coble, Harini Dasarathy
  • Patent number: 5330826
    Abstract: A metal substrate, e.g. titanium, having a calcium phosphate coating, particularly hydroxylapatite, and containing a metal such as cobalt, codeposited on the substrate by electrolyzing a cobalt salt, particularly cobalt sulfate, liquid electrolyte having a calcium phosphate material, particularly hydroxylapatite, suspended therein, employing a cobalt anode and the metal substrate as cathode. The particles of cobalt so codeposited with the particles of calcium phosphate material, e.g. hydroxylapatite, hold the latter particles strongly on the substrate metal. If desired, a second coating of the pure calcium phosphate material, e.g. "hydroxylapatite", optionally can be applied over the codeposited hydroxylapatite-cobalt coating. The calcium phosphate coated metal substrate of the invention, particularly the codeposited "hydroxylapatite"-cobalt coating, on a titanium or cobalt-chromium substrate, has particular value for application as medical implants, e.g.
    Type: Grant
    Filed: August 13, 1990
    Date of Patent: July 19, 1994
    Assignee: McDonnell Douglas Corporation
    Inventors: Timothy E. Taylor, Clyde Riley, William R. Lacefield, Jr., Harold D. Coble, George W. Maybee
  • Patent number: 5326525
    Abstract: A process is disclosed for fabricating a metal aluminide composite which comprises providing a metal aluminide, such as titanium aluminide, or a titanium aluminide alloy, and a reinforcing fiber material, such as silicon carbide fiber, and placing an interlayer or diffusion barrier layer in the form of a metal selected from the group consisting of silver, copper and gold, and alloys thereof, between the metal aluminide and the reinforcing fiber material. The interlayer metal can be a foil of the metal or in the form of a coating, such as a silver coating, on the reinforcing fiber material. The metal aluminide, the reinforcing fiber material, and the metal interlayer, e.g., in the form of a packet of a plurality of alternate layers of metal aluminide alloy and reinforcing fiber material, each layer being separated by the metal interlayer, is pressed and heated at an elevated temperature, e.g., ranging from about 900.degree. to about 1200.degree. C., at which diffusion bonding occurs.
    Type: Grant
    Filed: July 11, 1988
    Date of Patent: July 5, 1994
    Assignee: Rockwell International Corporation
    Inventor: Amit K. Ghosh
  • Patent number: 5297760
    Abstract: Fuselage skin lap splice for aircraft formed of metal or composite skin panels. The adjacent skin panels comprise an outer skin and an inner skin, having contacting overlapping longitudinal edge portions, and a plurality of fasteners connecting such overlapping edge portions. A plurality of outwardly extending fingers are integrally connected along the edge portion of the inner skin and at least one longitudinal row of fasteners passes through the fingers and connects the outer skin and the fingers. Preferably the fingers are lollipopped, that is, have one or more protrusions thereon. The fingers at the end of the inner skin are flexible and soften and the load transfer through the fasteners, reducing the peak bearing stress and increasing the fatigue life of the splice. Alternatively, the desired flexibility at the end of the inner skin can be achieved by providing a plurality of large holes near the edge of the inner skin rather than by the provision of the fingers having apertures therebetween.
    Type: Grant
    Filed: August 21, 1992
    Date of Patent: March 29, 1994
    Assignee: McDonnell Douglas Corporation
    Inventor: Leonard J. Hart-Smith
  • Patent number: 5296285
    Abstract: An aluminum or aluminum alloy substrate having a low absorptance high emittance two-layer coating produced by first anodizing the substrate to form an anodic coating, followed by applying a topcoat of an inorganic white paint on the anodic coating, such dual layer coated substrate having spacecraft application, particularly for radiators.
    Type: Grant
    Filed: May 26, 1992
    Date of Patent: March 22, 1994
    Assignee: McDonnell Douglas Corporation
    Inventors: Henry W. Babel, Huong G. Le
  • Patent number: 5291841
    Abstract: A method of multi-stage combustion of sulfur and nitrogen-bearing coal which provides high combustion efficiency while preventing formation of sulfur- and nitrogen-bearing air pollutants. In the first stage, a major fraction of the hydrocarbons is burned out of the fuel [stage (1a)] at high temperature and the sulfur bound in the coal is freed therefrom and is then captured by reaction with a solid basic compound such as limestone [stage (1b)] at relatively low temperature. In stage 2 the remaining hydrocarbons in the fuel are burned out, and the residual mixture of coal ash and calcium-sulfur compounds is melted, encapsulating the sulfur in the molten slag, and a major portion of the molten compounds is removed from the gas stream. In stage 3, oxidation of CO and H.sub.2 is almost entirely completed and combustion gases are substantially cooled by heat transfer to the working medium. In stage 4, combustion is finally completed in excess air.
    Type: Grant
    Filed: March 8, 1993
    Date of Patent: March 8, 1994
    Inventor: Owen W. Dykema
  • Patent number: 5284996
    Abstract: Method for storing a waste gas mixture comprised of nitrogen, oxygen, carbon dioxide, and inert gases, the gas mixture containing corrosive contaminants including inorganic acids and bases and organic solvents, and derived from space station operations. The gas mixture is stored under pressure in a vessel formed of a filament wound composite overwrap on a metal liner, the metal liner being pre-stressed in compression by the overwrap, thereby avoiding any tensile stress in the liner, and preventing stress corrosion cracking of the liner during gas mixture storage.
    Type: Grant
    Filed: February 28, 1992
    Date of Patent: February 8, 1994
    Assignee: McDonnell Douglas Corporation
    Inventor: Brian D. Vickers
  • Patent number: 5281388
    Abstract: Process for vacuum impregnation of a dry fiber reinforcement with a curable resin to produce a resin-fiber composite, by drawing a vacuum to permit flow of curable liquid resin into and through a fiber reinforcement to impregnate same and curing the resin-impregnated fiber reinforcement at a sufficient temperature and pressure to effect final curing. Both vacuum and positive pressure, e.g. autoclave pressure, are applied to the dry fiber reinforcement prior to application of heat and prior to any resin flow to compact the dry fiber reinforcement, and produce a resin-fiber composite of reduced weight, thickness and resin content, and improved mechanical properties. Preferably both a vacuum and positive pressure, e.g. autoclave pressure, are also applied during final curing.
    Type: Grant
    Filed: March 20, 1992
    Date of Patent: January 25, 1994
    Assignee: McDonnell Douglas Corporation
    Inventors: Raymond J. Palmer, William E. Moore
  • Patent number: 5268024
    Abstract: Precursor formulation for producing conductive coatings, e.g. nickel sulfide, on substrates such as fiberglass, comprising a soluble metal salt such as nickel acetate, a sulfur donor such as thiourea, a suitable solvent such as water or methanol, and a thickening agent to increase the viscosity of the precursor solution, such as the polyester formed by incorporating ethylene glycol and citric acid, or by addition of xanthan gum, into the precursor formulation. By employing a combination of xanthan gum and locust bean gum the precursor solution can be converted to a gel form. The conversion of the precursor composition into a thickened or gelled form facilitates its application in desired amount and without undue evaporation of solvent, onto a preselected area of the substrate, to form conductive patterns or gradients by various printing processes such as the gravure and transfer processes.
    Type: Grant
    Filed: July 31, 1992
    Date of Patent: December 7, 1993
    Assignee: Rockwell International Corporation
    Inventor: William P. Moran
  • Patent number: 5224668
    Abstract: An aircraft landing gear damping mechanism improvement of a damper containing piston means in a chamber of a housing, an orifice in the piston means and Belleville springs disposed in the chamber between the wall of the chamber and the piston means on opposite sides thereof. The improvement comprises means, e.g. in the form of a member having slots therein, and disposed between one end of the Belleville springs and the adjacent chamber wall, providing fluid communication of the inner cavity and outer cavity of the chamber below and above the Belleville springs.
    Type: Grant
    Filed: December 9, 1991
    Date of Patent: July 6, 1993
    Assignee: McDonnell Douglas Corporation
    Inventor: Wilfred E. Boehringer
  • Patent number: 5217600
    Abstract: Process for anodizing aluminum or its alloys to obtain a surface particularly having high infrared emittance by anodizing an aluminum or aluminum alloy substrate surface in an aqueous sulfuric acid solution at elevated temperature and by a step-wise current density procedure, followed by sealing the resulting anodized surface. In a preferred embodiment the aluminum or aluminum alloy substrate is first alkaline cleaned and then chemically brightened in an acid bath The resulting cleaned substrate is anodized in a 15% by weight sulfuric acid bath maintained at a temperature of 30.degree. C. Anodizing is carried out by a step-wise current density procedure at 19 amperes per square ft. (ASF) for 20 minutes, 15 ASF for 20 minutes and 10 ASF for 20 minutes. After anodizing the sample is sealed by immersion in water at 200.degree. F. and then air dried. The resulting coating has a high infrared emissivity of about 0.92 and a solar absorptivity of about 0.
    Type: Grant
    Filed: May 1, 1992
    Date of Patent: June 8, 1993
    Assignee: McDonnell Douglas Corporation
    Inventors: Huong G. Le, Dudley L. O'Brien
  • Patent number: 5204161
    Abstract: The structure and process for making a metallic panel structure from a plurality of core panels each comprised of a pair of sheets of superplastic material welded together along a plurality of weld lines. The core panels are joined together, with the weld lines of one core panel positioned normal to the weld lines of the adjacent core panel. The resulting assembly is placed in a die. The die is heated to superplastic forming temperature, and gas pressure is applied to the spaces between the sheets of the respective core panels, causing superplastic forming and expansion of the sheets of each core panel to form a series of bulges between weld lines of one core panel, and a series of similar bulges between weld lines of the adjacent core panel, the bulges expanding inwardly toward each other. The two series of bulges are orthogonally disposed, the bulges from the two core panels contacting and forming around each other.
    Type: Grant
    Filed: June 3, 1991
    Date of Patent: April 20, 1993
    Assignee: McDonnell Douglas Corporation
    Inventors: Richard G. Pettit, Ken K. Yasui