Patents by Inventor Allen Bloom

Allen Bloom 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).

  • Organic medium for thin-phase holography
    Patent number: 4055423
    Abstract: Permanent thin-phase holograms are recorded wherein the recording medium contains a recording layer comprised of an olefinically unsaturated negative photoresist polymer containing an .alpha.-diketone.
    Type: Grant
    Filed: April 15, 1976
    Date of Patent: October 25, 1977
    Assignee: RCA Corporation
    Inventors: Robert Alfred Bartolini, Allen Bloom
  • Organic volume phase holographic recording medium
    Patent number: 4049459
    Abstract: Holographic recording media which form permanent holograms with excellent recording sensitivity are prepared from .alpha.-diketones which are capable of intermolecular hydrogen atom abstraction dissolved in a transparent, cured vinyl benzene polyester polymerhost.
    Type: Grant
    Filed: February 26, 1976
    Date of Patent: September 20, 1977
    Assignee: RCA Corporation
    Inventors: Allen Bloom, Robert Alfred Bartolini
  • Method for increasing the conductivity of electrically resistive organic materials
    Patent number: 4033905
    Abstract: Electrically resistive organic materials, e.g. silicone rubber, thermoplastic resins, and liquid crystals, are made more electrically conductive by the addition of an effective amount of a compound of the formula: ##STR1## wherein R.sub.1 is selected from the group consisting of hydrogen, alkyl, and phenyl-substituted alkyl; R.sub.2 is alkyl with 8 - 20 carbon atoms; and Z is selected from the group consisting of phenyl and alkyl-substituted phenyl. The invention is particularly applicable to silicone rubber light valves and liquid crystals.
    Type: Grant
    Filed: November 5, 1975
    Date of Patent: July 5, 1977
    Assignee: RCA Corporation
    Inventors: Allen Bloom, Daniel Louis Ross
  • Electro-optic device
    Patent number: 4032470
    Abstract: Novel liquid crystal dyes of the formula ##STR1## wherein (CHOL) is a cholesteryl radical, X can be 0 or NH, R.sub.1 can be H, -OH, methyl, fluoro or chloro; R.sub.2 can be --NO.sub.2, --CN, N--(alkyl).sub.2, --OCOOR, --OCOR, alkyl or alkoxy and R.sub.3 can be H, methyl, fluoro or chloro, can be added to known liquid crystal compositions to impart color to the mixtures and improved contrast to a liquid crystal electro-optic device containing such mixtures.
    Type: Grant
    Filed: December 22, 1975
    Date of Patent: June 28, 1977
    Assignee: RCA Corporation
    Inventors: Allen Bloom, Ling Kong Hung
  • Method of improving the sensitivity of organic volume phase holographic recording media
    Patent number: 4032340
    Abstract: The sensitivity of organic volume phase holographic recording media comprising an .alpha.-diketone in an acrylic polyester polymer can be improved by heating the recording media during or after recording.
    Type: Grant
    Filed: April 10, 1975
    Date of Patent: June 28, 1977
    Assignee: RCA Corporation
    Inventors: Allen Bloom, Robert Alfred Bartolini, Herbert Alfred Weakliem
  • Ablative optical recording medium
    Patent number: 4023185
    Abstract: An ablative recording medium comprises a substrate coated with a light reflecting coating which in turn is coated with a light absorptive layer of 4-phenylazo-1-naphthylamine formed by evaporation of Sudan Black B dyestuff. During recording, portions of the organic coating are ablated, or vaporized, by a modulated focussed light beam, thereby exposing portions of the reflective layer and recording video information as a reflective-antireflective pattern.
    Type: Grant
    Filed: March 19, 1976
    Date of Patent: May 10, 1977
    Assignee: RCA Corporation
    Inventors: Allen Bloom, Robert Alfred Bartolini, Alan Edward Bell
  • 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