Patents Represented by Attorney R. S. Sciascia
  • Patent number: 4372803
    Abstract: An improved method for etch-thinning silicon devices using three sequential tches. The device is pre-thinned in a hot KOH-H.sub.2 O etch. The thinning etch is a hydrofluoric, nitric, acetic acids (1:3:10) and a precise amount of hydrogen peroxide mixture. The cleanup etch is a potassium permanganate, hydrofluoric and acetic acids mixture. The result is a repeatedly specular, smooth, uniform, 10 micron thick membrane over the pixels with a p.sup.+ surface to enhance the CCI optical response.
    Type: Grant
    Filed: September 26, 1980
    Date of Patent: February 8, 1983
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Joseph R. Gigante
  • Patent number: 4371882
    Abstract: A controlled environment process for making diode arrays by depositing the sublimate of a semiconductor material through an aperture of a mask placed nearby a substrate and then subjecting part of the sublimate to ion implantation. The aperture causes diffraction of the sublimate vapor stream, while the proximity of the edges of the aperature to the substrate causes the central plateau of the deposited thin-film to have a rounded rim leading to sides that taper smoothly in thickness to the substrate. Ion implantation to a controlled depth creates an isolated planar junction. Surface layers of a gold electrode running onto the substrate from different surface areas of the thin-film provide for off-mesa bonding of electrical leads.
    Type: Grant
    Filed: July 20, 1978
    Date of Patent: February 1, 1983
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Hayden Morris, Richard F. Bis
  • Patent number: 4371232
    Abstract: A variable temperature method for the preparation of single and multiple taxial layers of single-phase (e.g., face-centered cubic), ternary lead chalcogenide alloys (e.g., lead cadmium sulfide [Pb.sub.1-w Cd.sub.w ].sub.a [S].sub.1-a wherein w varies between zero and fifteen hundredths, inclusive, and a=0.500.+-.0.003), deposited upon substrates of barium fluoride, BaF.sub.2, maintained in near thermodynamic equilibrium with concurrently sublimated lead alloy and chalcogenide sources. During preparation, the temperature of the substrate is varied, thereby providing an epilayer with graded composition and predetermined electrical and optical properties along the direction of growth. This growth technique can be used to produce infrared lenses, narrowband detectors, and double heterojunction lasers.
    Type: Grant
    Filed: April 25, 1980
    Date of Patent: February 1, 1983
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: James D. Jensen, Richard B. Schoolar
  • Patent number: 4371420
    Abstract: In a process for growth of a layer of semiconductor material by precipitation from a solution of the semiconductor material in a solvent by liquid phase epitaxial growth (LPE), the improvement is the step of adding from approximately 0.01% to 1.0% by weight of a material which forms a stable oxide or sulfide and is soluble in the solvent to the solution prior to the step of precipitating the semiconductor layer to eliminate the deleterious effects of residual oxygen. A relatively short annealing time is required to dissolve the addition in the solvent and allow the addition to react with dissolved oxygen or other impurities before a conventional LPE growth process may be initiated, although high temperature anneals of varying length may precede or follow the addition of the oxide-forming or sulfide-forming material. Zirconium, titanium, vanadium, scandium, yttrium, and aluminum are in general suitable for use as the oxide-forming material.
    Type: Grant
    Filed: March 9, 1981
    Date of Patent: February 1, 1983
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: David A. Stevenson
  • Patent number: 4369679
    Abstract: A portable machining device that is particularly useful for removing excess peripheral weld from the flat surface of welded-in valves such as breech lock gate valves. The portable machining device includes a housing, a cutting tool, a vertical feed mechanism, a horizontal feed mechanism, and a rotation drive mechanism. The vertical feed and rotation drive mechanisms have central openings for receiving the upward extending valve stem from the surface to be machined. The base of the housing is ring shaped and includes slots for attachment to the flat surface of the valve. In operation, the cutting tool is rotated and fed vertically and horizontally to machine the excess weld to be flush with the flat surface.
    Type: Grant
    Filed: November 12, 1980
    Date of Patent: January 25, 1983
    Inventor: Norman E. Jones
  • Patent number: 4364170
    Abstract: A ball bearing assembly device for permitting dry assembly of bearings wiut additional equipment. The assembly device is provided with an inner body surrounded by an outer body so as to create a circumferential gap therebetween. The gap is provided with a vacuum connection which allows positioning of ball bearings on a ball bearing shaft or inner bearing ring when the shaft or ring is mounted on the inner body. The bearing shaft is placed into the inner body so as to provide a mounting to aid in insertion of the bearing shaft or ring into the outer bearing ring. The bearing shaft may be mounted on a reciprocating shaft for insertion into the outer bearing ring.
    Type: Grant
    Filed: January 13, 1981
    Date of Patent: December 21, 1982
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Joseph M. Ratliffe
  • Patent number: 4362898
    Abstract: A device for grounding a coaxial cable to a ship's hull or bulkhead having n opening for the cable, is configured to include a split metallic cone with serrated apex portions fastenable around a bared shield of the coaxial cable, and flanged base portions securable to the ship's hull and overlying the opening, such that the split cone forms substantially 360.degree. of coupling between the bared shield and the ship's hull. This configuration increases the area and effectiveness of electrical contact between the bared shield and the ship's hull while decreasing the effective inductance and overall impedance, thereby reducing the amplitude of high frequency transients caused by an externally induced electromagnetic pulse (EMP) or any electromagnetic interference source having a similar frequency range.
    Type: Grant
    Filed: December 9, 1980
    Date of Patent: December 7, 1982
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Bernard Zendle, Marcella Petree
  • Patent number: 4359543
    Abstract: A water-displacing paint is disclosed for coating metallic surfaces in hu environments to prevent corrosion. The paint comprises controlled proportions of a silicone alkyd resin to serve as a binder and physical barrier, solvents including ethyl acetate, aromatic mineral spirits and 1,1,1 trichlorotrifluorethane for ensuring water immiscibility, a petroleum sulfonate to inhibit corrosion and aid surface absorption, and an organo-titanate of isopropyl tri-titanate to promote surface adhesion. Selected amounts of titanium dioxide and zinc molybdate are included as pigments in one effective example of the paint to provide it a white color. Alternate colors may be produced conventionally by adding standard tinting pigments in amounts sufficient to yield the desired color.
    Type: Grant
    Filed: July 30, 1981
    Date of Patent: November 16, 1982
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Charles R. Hegedus, Kenneth G. Clark
  • Patent number: 4357185
    Abstract: An improved method of coating crystalline high explosives with polyethylene ax comprising:(a) forming a loose slurry of finely divided crystalline explosive particles in water;(b) adding an emulsion of(1) an emulsifiable polyethylene wax,(2) potassium stearate,(3) KOH, and(4) water to the slurry;(c) heating the slurry-emulsion mixture to a temperature in the range of from about 92.degree. C. to about 98.degree. C. with stirring;(d) adding enough acetic acid to the slurry-emulsion mixture to lower the pH to about 6 with stirring;(e) cooling the resulting solution; and(f) isolating the product polyethylene wax coated high explosive particles.
    Type: Grant
    Filed: May 20, 1981
    Date of Patent: November 2, 1982
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Vernon D. Ringbloom
  • Patent number: 4357688
    Abstract: A novel low cost air-launched sonobuoy having a spherical housing of a liweight semi-rigid foam housing encapsulated the electronic components. The housing includes recesses for receiving a hydrophone and cable pack, and for inserting D-size batteries just prior to launching. A vertical antenna is wrapped around the housing and prevents the pack from deployment until the sonobuoy is charged with the batteries and immersed in water. The free end of the antenna is released and unwraps to permit deployment of the hydrophone and cable pack. The sonobuoy is stored without the batteries in a sealed moisture-proof envelope which can be easily torn open and removed when desired.
    Type: Grant
    Filed: September 11, 1981
    Date of Patent: November 2, 1982
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: John R. Dale, Malcolm I. Dickinson
  • Patent number: 4354770
    Abstract: A wedge assembly for securing a circuit board in an electronic package gi positive surface contact and excellent heat transfer between the multi-layer board and the electronic package as well as positive lock under vibration and shock. A housing, which may be mounted on a multi-layer board, contains a wedge member having two ramped ends within an open cavity having a single ramped end. Means such as a ramped anvil which slides within the cavity under force from a screw is provided within the cavity for adjusting the wedge member relative to the housing to provide positive contact between the electronic package and the multi-layer board.
    Type: Grant
    Filed: May 19, 1980
    Date of Patent: October 19, 1982
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Sheldon A. Block
  • Patent number: 4353769
    Abstract: A polyurethane-quartz laminate suitable for aircraft radomes. Controlled amounts of a mixture of unpolymerized 4,4 diphenyl methane diisocyanate (MDI) and 2,4 toluene diisocyanate (TDI) are polymerized with ethylene glycol at a preselected temperatures and periods to produce a polymeric resin of relatively few nonpolar isocyanate groups. The resin is impregnated and cured in layers of quartz cloth to form a relatively high strength composite or laminate having a low dielectric constant.
    Type: Grant
    Filed: October 3, 1980
    Date of Patent: October 12, 1982
    Inventor: Henry J. Lee
  • Patent number: 4352292
    Abstract: A method and apparatus for measuring the dynamic material constants of rur compounds. The rubber compound is tested in strip form by attaching one end of the strip to an electromechanical shaker while the opposite end of the strip is suspended under constant tension. The electromechanical shaker propagates an acoustic wave in the test strip and a piezoelectric transducer positioned at a first point on the test strip measures the mechanical response of the strip for phase and amplitude. The shaker is programmed to step piecewise over the frequency range from 100 Hz to 40 KHz by a frequency synthesizer. The distance between the shaker and the transducer is changed and data is obtained for a second point on the strip. The test values obtained are used to calculate Young's Modulus and the loss factor for the rubber compound.
    Type: Grant
    Filed: July 28, 1980
    Date of Patent: October 5, 1982
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Walter M. Madigosky, Gilbert F. Lee
  • Patent number: 4352542
    Abstract: A connector for joining a fiber optic cable. The connector is constructed th a thin wall tube enclosing strips of a shape memory alloy material. The strips are bent and inserted into the thin wall tube such that an axial cavity is formed between the opposing strips. The axial cavity provides a self-centering mechanism for positioning fiber optic cables along the central axis of the tube. Dimensions of the tube and shape memory alloy strips are chosen such that fiber optic cables inserted into each end of the connector when it is above the transition temperature range of the strips will be forced into coaxial alignment when the connector is cooled to a temperature below the transition range of the strips.
    Type: Grant
    Filed: August 26, 1980
    Date of Patent: October 5, 1982
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: John E. Tydings
  • Patent number: 4350728
    Abstract: Interlaminar shear strength of an aircraft wing made of graphite-epoxy laate is significantly increased by embedding thin steel wires in preselected locations of high stress in alternating rows .+-.45.degree. to the plane of the laminate before it is cured. This cross wire reinforcement prevents brittle delamination, arrests propagation of delamination and reduces scatter of interlaminar strength.
    Type: Grant
    Filed: October 2, 1980
    Date of Patent: September 21, 1982
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Shih L. Huang, Edward J. McQuillen, Robert J. Richey, Jr.
  • Patent number: 4349502
    Abstract: Fabrication of unoriented phase I crystalline PVF.sub.2 is described wherein commercially available PVF.sub.2 phase II (crystalline form) is placed in a high pressure cell and its temperature is raised slightly over its melting point. The sample is then subjected to abrupt changes in high pressure and the temperature is dropped thereafter. The pressure is then reduced resulting in a product which contains both phase I and phase II forms of PVF.sub.2. The phase I content of the product varies from a few percent and up depending upon the pressure applied during the quenching step.
    Type: Grant
    Filed: October 24, 1980
    Date of Patent: September 14, 1982
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Kook D. Pae, Brian A. Newman, Jerry I. Scheinbeim
  • Patent number: 4349824
    Abstract: A down link UHF antenna is designed which includes four equispaced arms ml plated at an angle on a fiberglass cylinder. A coaxial connector is connected to each of the four arms with the metal plated inner surface as the common ground.
    Type: Grant
    Filed: October 1, 1980
    Date of Patent: September 14, 1982
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Eleanor S. Harris
  • Patent number: 4349396
    Abstract: A pyrotechnic composition, suitable for metal cutting, comprises an oxidi selected from the class consisting of calcium sulfate hemihydrate, anhydrous calcium sulfate, magnesium monohydrate, anhydrous magnesium sulfate, anhydrous strontium sulfate, and mixtures thereof; a metal fuel, a halopolymeric binder; and sulfur.
    Type: Grant
    Filed: September 22, 1980
    Date of Patent: September 14, 1982
    Assignee: The United Stated of America as represented by the Secretary of the Navy
    Inventors: Kurt F. Mueller, Marguerite S. Chang, Robert F. Farncomb, Lyle O. Malotky
  • Patent number: 4348347
    Abstract: A stretch-staging method is disclosed for straightening continuous fiber columns impregnated within a resin-based tape material to increase the strength and reliability of the material. The tape material is supported about the circumference of a half-cylindrical fixture and separated therefrom by a thin lubricating film to reduce surface friction. Loads of substantially equal weight are longitudinally applied at opposite ends of the tape material about the fixture, and the combination is heated in an oven to an elevated temperature for a predetermined period of time thereby stretching and staging the tape material so that distorted fiber columns are straightened and retained in a straightened condition as the resin is advanced.
    Type: Grant
    Filed: April 27, 1981
    Date of Patent: September 7, 1982
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Gary G. Brown
  • Patent number: 4347485
    Abstract: A method of achieving inversion in solid-state rare-earth materials for blue-green laser operation. A XeF excimer laser is used to pump a matching transition in divalent ytterbium in a host material. The host material is co-doped with a trivalent ion such as praseodymium (Pr.sup.3+) so that energy transfer to the trivalent ion will take place. Laser action is then from the Pr.sup.3+ ion. Alternative matching absorption transitions also occur in the trivalent rare-earth ions of Tb, Dy, Ho, and Nd.
    Type: Grant
    Filed: May 23, 1979
    Date of Patent: August 31, 1982
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Leon Esterowitz, Roger E. Allen, Melvin R. Kruer, Filbert J. Bartoli