Patents Represented by Attorney Joseph T. Harcarik

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  • Holographic recording medium employing a photoconductive layer and a low molecular weight microcrystalline polymeric layer
    Patent number: 4032338
    Abstract: A holographic recording medium comprising a conductive substrate, a photoconductive layer and an electrically alterable layer of a linear, low molecular weight hydrocarbon polymer has improved fatigue resistance. An acrylic barrier layer can be interposed between the photoconductive and electrically alterable layers.
    Type: Grant
    Filed: October 8, 1975
    Date of Patent: June 28, 1977
    Assignee: RCA Corporation
    Inventor: Robert Allen Gange
  • Method for desensitizing recorded organic volume phase holographic recording media
    Patent number: 4022618
    Abstract: Organic volume phase holographic recording medium comprising an .alpha.-diketone in an acrylic polyester polymer is desensitized by exposing the medium to desensitizing light after recording is complete. This inactivates the .alpha.-diketone and prevents damage to the medium during readout.
    Type: Grant
    Filed: April 10, 1975
    Date of Patent: May 10, 1977
    Assignee: RCA Corporation
    Inventors: Robert Alfred Bartolini, William Joseph Burke, Allen Bloom
  • Olefin-SO.sub.2 copolymer film adhesion to a substrate
    Patent number: 4007295
    Abstract: To improve the adherence of an olefin-SO.sub.2 copolymer film employed as an electron beam resist to a metallic substrate, a thin film of gold is first applied to the substrate. The resulting bond is strong enough to withstand exposure to electron beams, development of the resist film and electroplating of the film witout undercutting, lifting or distortion of the film.
    Type: Grant
    Filed: July 28, 1975
    Date of Patent: February 8, 1977
    Assignee: RCA Corporation
    Inventors: Eugene Samuel Poliniak, Richard Joseph Himics, Henry Wielicki
  • Method of preparing optical waveguides
    Patent number: 3997687
    Abstract: A single crystal of lithium tantalate is pretreated to diffuse lithium atoms into the crystal. Niobium is then diffused into the pretreated crystal to form an optical waveguide.
    Type: Grant
    Filed: April 21, 1975
    Date of Patent: December 14, 1976
    Assignee: RCA Corporation
    Inventor: William Phillips