Patents Represented by Attorney H. Christoffersen
  • Patent number: 4561087
    Abstract: A video disc comprises a grooved disc having video information in the form of a surface relief pattern within the groove, the disc made from a plastic material containing finely divided conductive particles such that the bulk resistivity at 900 MHz is less than 500 ohm-centimeters.
    Type: Grant
    Filed: December 20, 1979
    Date of Patent: December 24, 1985
    Assignee: RCA Corporation
    Inventors: Leonard P. Fox, Pabitra Datta, Dennis L. Matthies, Hirohisa Kawamoto
  • Patent number: 4385805
    Abstract: A liquid crystal lens display system comprises a liquid crystal lens, display elements, a polarizer and a light source. The liquid crystal lens comprises a dielectrically anisotropic liquid crystal material covering two electrodes each having a plurality of spaced, parallel, interleaved fingers. The display elements comprise one or more elements to which are affixed alphanumeric or analog information and which are optically distinguishable. The angle of refraction of light passing through the liquid crystal lens is electrically alterable by applying a voltage source to the lens' electrodes. Portions of one of the display elements viewed through an activated liquid crystal lens are changed since light from these portions are no longer within the field of view of the observer.
    Type: Grant
    Filed: July 3, 1980
    Date of Patent: May 31, 1983
    Assignee: RCA Corporation
    Inventor: Donald J. Channin
  • Patent number: 4340167
    Abstract: Components can be held down on printed circuit boards by applying compositions comprising a water soluble polymeric compound or mixture of compounds which can be dissolved in water to give a greater than 45% solids content with a viscosity range of about 8 to about 12 poises at about 25.degree. C., a water soluble mono- or polyhydric alcohol, water, a wetting agent, and a water soluble organic acid having a keto oxygen group within 4 carbon atoms of the carboxylic acid group, to the printed circuit board prior to insertion of the components to keep them in place during soldering operations. The mixture can be completely removed after soldering by a water rinse.
    Type: Grant
    Filed: October 26, 1979
    Date of Patent: July 20, 1982
    Assignee: RCA Corporation
    Inventors: Marvin Packer, Otis D. Black
  • Patent number: 4322599
    Abstract: A method and apparatus for welding a header to a heat sensitive cap to form an electro-optic device housing without weld flanges. A collet electrode is used to provide a radially compressive force which provides good electric and thermal contact to the wall of the heat sensitive cap and maintains the glass to metal seal under compression.
    Type: Grant
    Filed: April 28, 1980
    Date of Patent: March 30, 1982
    Assignee: RCA, Inc.
    Inventor: Rene E. Cardinal
  • Patent number: 4314763
    Abstract: A laser beam projected through a prism in a direction normal to the surface of a circular wafer is focused into a spot area and scanned along a spiral path on this surface. The focusing means comprises a relatively large aperture lens and the prism is on the lens axis. The retroreflected specular light passes through the lens and is prevented from reaching a light detector in the image plane of the lens by the prism. When the beam illuminates a microscopic surface defect on the wafer, the light is diffracted and reflected therefrom, and the lens captures that portion of the reflected light within the solid angle subtended by the lens, and passes that portion thereof not blocked by the prism, to the light detector. The output of the detector may be employed to intensity modulate the beam of a cathode-ray tube display, the beam of which is spirally scanned in synchronism with the scanning of the light beam.
    Type: Grant
    Filed: January 4, 1979
    Date of Patent: February 9, 1982
    Assignee: RCA Corporation
    Inventors: Edgar F. Steigmeier, Karl Knop
  • Patent number: 4312025
    Abstract: A capacitor comprises a resilient strip of magnetic material, such as steel, a strip of non-magnetic material such as brass and a layer of insulation between the two. An end portion of the resilient strip is movable between a position substantially parallel and close to the brass strip and a position as an angle to and spaced further from the brass strip. A magnetic coil or permanent magnet controls the position of the movable end portion of the resilient strip relative to the brass strip to thereby control the capacitance between the two strips.
    Type: Grant
    Filed: December 6, 1978
    Date of Patent: January 19, 1982
    Assignee: RCA Corporation
    Inventor: Lawrence A. Boyer
  • Patent number: 4300143
    Abstract: An optical recording medium comprises a light reflecting material which is coated with a light absorbing layer and overcoated with a thin, amorphous, coherent layer of an optically transparent and chemically and thermally stable material such as silicon dioxide. During recording, portions of the light absorbing layer are ablated by a modulated focussed light beam, thereby exposing portions of the reflecting layer while leaving the overcoat layer intact. Information is recorded in the form of a reflective-antireflective pattern. Dust particles and other surface contaminants can be wiped or washed off the recording medium without damage to the light absorbing layer.
    Type: Grant
    Filed: October 22, 1979
    Date of Patent: November 10, 1981
    Assignee: RCA Corporation
    Inventors: Alan E. Bell, Robert A. Bartolini, Allen Bloom, William J. Burke
  • Patent number: 4292646
    Abstract: A semiconductor thyristor device having a cathode region and an anode region comprises ballast means adjacent thereto. The device further comprises first and second electrode means which are positioned such that only the cathode region and the anode region respectively are contacted thereby. The present structure is compatible with conventional device structures.
    Type: Grant
    Filed: January 7, 1977
    Date of Patent: September 29, 1981
    Assignee: RCA Corporation
    Inventors: Jacques M. Assour, Theresa I. Bates, John R. Bender, John M. S. Neilson
  • Patent number: 4282268
    Abstract: This invention pertains to a method of depositing a silicon oxide, such as silicon dioxide, dielectric layer on a substrate by utilizing a glow discharge and a dielectric precursor having the formula ##STR1## wherein R.sub.1 is selected from the group consisting of H and --CH.sub.3, R.sub.2 and R.sub.3 are independently selected from the group consisting of H, --CH.sub.3, --OCH.sub.3 and --OC.sub.2 H.sub.5 and R.sub.4 is selected from the group consisting of --OCH.sub.3 and --OC.sub.2 H.sub.5.
    Type: Grant
    Filed: June 6, 1978
    Date of Patent: August 4, 1981
    Assignee: RCA Corporation
    Inventors: Eldon B. Priestley, Patrick J. Call
  • Patent number: 4282538
    Abstract: A dielectric-isolated PNP transistor with Schottky protection, either alone or as one of an integrated pair of complementary bipolar transistors has complete dielectric isolation from neighboring devices and from the substrate by means of a topside anisotropic etch. This leaves the devices in mesa form, thinner versions having the facility of lateral terminations, e.g. for the collector. The method is advantageously adapted to provide single type or complementary bipolars with integrated Schottky barrier protection.
    Type: Grant
    Filed: August 6, 1979
    Date of Patent: August 4, 1981
    Assignee: RCA Corporation
    Inventors: Howard R. Beelitz, Donald R. Preslar
  • Patent number: 4275101
    Abstract: Molecular distillation of methyl alkyl siloxanes of the formula ##STR1## wherein R.sub.1 and R.sub.2 are alkyl groups of 4-20 carbon atoms and m and p are integers to produce a distillate having a molecular weight fraction wherein the sum of m and p is about 4, produces an improved lubricant for the video disc, a lubricant that is stable to long term storage and to wide variations in temperature and relative humidity.
    Type: Grant
    Filed: August 9, 1979
    Date of Patent: June 23, 1981
    Assignee: RCA Corporation
    Inventors: Chih C. Wang, Lincoln Ekstrom, Thomas C. Lausman, Henry Wielicki
  • Patent number: 4273822
    Abstract: A glazing paste comprising glass frit, a metal oxide powder selected from the group consisting of aluminum oxide (Al.sub.2 O.sub.3), magnesium oxide (MgO), calcium oxide (CaO), and zinc oxide, (ZnO), and an organic vehicle.
    Type: Grant
    Filed: July 18, 1977
    Date of Patent: June 16, 1981
    Assignee: RCA Corporation
    Inventor: Kenneth R. Bube
  • Patent number: 4269654
    Abstract: An etching solution for etching composite structures of silicon nitride on silicon oxide on silicon substrates which etches the silicon nitride at a rate equal to or faster than the silicon oxide which comprises concentrated aqueous hydrogen fluoride in a high boiling, organic solvent.
    Type: Grant
    Filed: May 9, 1979
    Date of Patent: May 26, 1981
    Assignee: RCA Corporation
    Inventors: Cheryl A. Deckert, George L. Schnable
  • Patent number: 4267257
    Abstract: This invention pertains to an electron beam resist method for forming a surface relief pattern in a poly(oelfin sulfone) layer wherein the polymer layer is useful for depositing a metal film thereon and thereby forming a corresponding surface relief pattern in the metal film. The surface relief pattern is formed using poly(3-methyl-1-cyclopentene sulfone) as the poly(olefin sulfone) layer and using a mixture of cycloheptanone and 2-methylcyclohexanol or a mixture of 2-methylcyclohexanone and 3-methylcyclohexanol as the developer for the poly(3-methyl-1-cyclopentene sulfone) layer.
    Type: Grant
    Filed: July 30, 1976
    Date of Patent: May 12, 1981
    Assignee: RCA Corporation
    Inventors: Eugene S. Poliniak, Nitin V. Desai
  • Patent number: 4260525
    Abstract: An aluminum flux method of preparing binary, ternary, and quaternary single crystal metal hexaborides. The single crystals are prepared by mixing a metal oxide, carbonate, or nitrate compound with boron powder in an amount of aluminum which will solubilize the boron at a reaction temperature of from about 1200.degree. C. to about 1600.degree. C. The mixture is held at the reaction temperature for a sufficient time to form the desired single crystal hexaboride.
    Type: Grant
    Filed: November 27, 1978
    Date of Patent: April 7, 1981
    Assignee: RCA Corporation
    Inventors: Gregory H. Olsen, Alfred V. Cafiero
  • Patent number: 4252886
    Abstract: Homopolymers of 1-aza-5-acryloxymethyl-3,7-dioxa-bicyclo[3.3.0]octane are useful as resists for recording information patterns having high sensitivity and excellent contrast between exposed and unexposed areas.
    Type: Grant
    Filed: November 13, 1978
    Date of Patent: February 24, 1981
    Assignee: RCA Corporation
    Inventors: Richard J. Himics, Michael Kaplan, Nitin V. Desai
  • Patent number: 4252848
    Abstract: Thin, stable, low surface energy perfluorinated polymer films can be applied to a substrate by glow discharging the substrate in the presence of a perfluorocycloalkane or -cycloolefin or perfluoroalkyl-substituted derivatives thereof.
    Type: Grant
    Filed: April 11, 1977
    Date of Patent: February 24, 1981
    Assignee: RCA Corporation
    Inventors: Pabitra Datta, Grzegorz Kaganowicz
  • Patent number: 4246551
    Abstract: A circuit for quickly discharging a timing capacitor which is connected between the collector of a first transistor and the base of a second transistor, and which is charged via a current source connected to the collector of the first transistor. The circuit includes a third transistor whose conduction path is connected across the capacitor and whose control electrode is connected to the emitter of the first transistor. A turn-on current supplied to the base of the first transistor causes the timing capacitor to be discharged by a current whose amplitude is approximately equal to the turn-on current multiplied by the product of the forward current gains of the first and third transistors.
    Type: Grant
    Filed: November 30, 1978
    Date of Patent: January 20, 1981
    Assignee: RCA Corporation
    Inventor: Carl F. Wheatley, Jr.
  • Patent number: RE30587
    Abstract: The transistors of a differential amplifier are coupled at their common emitter electrode connection to a low voltage power supply terminal and at their collector electrodes through respective current sinks to a point of reference potential. The collector electrodes are maintained at a voltage level above the reference potential to permit input signal swings at the base electrodes of the transistors a comparable amount below the reference voltage level. Current sources are provided for satisfying that portion of the current demand of these sinks not furnished by the transistors. When the amplifier is connected to operate as a voltage follower, additional transistors may be provided to prevent an undesirable change in the polarity of the output signal, when the input signal swings substantially below the reference voltage level.
    Type: Grant
    Filed: October 25, 1978
    Date of Patent: April 21, 1981
    Assignee: RCA Corporation
    Inventor: Otto H. Schade, Jr.
  • Patent number: RE31166
    Abstract: Illegible information recorded along a track of a magnetic record medium is recovered by relatively moving the read head from its normal position at the approximate center of the track to a new position at an edge of the track and then creating relative movement between the head and record medium in the track direction.
    Type: Grant
    Filed: November 7, 1979
    Date of Patent: March 1, 1983
    Assignee: RCA Corporation
    Inventor: Peter B. Korda