With Shield Or Additional Electrode Patents (Class 313/492)
  • Patent number: 4289991
    Abstract: The light output and lumen maintenance of fluorescent lamps with or without a conductive film, are improved by coating the glass envelope or the conductive glass envelope with a thin transparent film of Al.sub.2 O.sub.3.The alumina film is obtained from a coating of a binderless suspension of submicron size Al.sub.2 O.sub.3 particles in lightly acidified water and has a thickness of 20 to 80 nanometers.
    Type: Grant
    Filed: September 6, 1977
    Date of Patent: September 15, 1981
    Assignee: GTE Products Corporation
    Inventor: Willy P. Schreurs
  • Patent number: 4129802
    Abstract: A low-pressure mercury vapor discharge lamp having an internal transmissive starting strip with two separate parts. The separation between the parts is bridged by a narrow straight or helix-shaped conductive connecting strip to bring the total resistance of the starting strip to a value between 50,000 and 150,000 ohms.
    Type: Grant
    Filed: September 6, 1977
    Date of Patent: December 12, 1978
    Assignee: U.S. Philips Corporation
    Inventors: Louis E. Vrenken, Franciscus M. P. Oostvogels, Rein W. VAN DER Wolf
  • Patent number: 4032813
    Abstract: An energy saving fluorescent lamp utilizing a krypton-neon fill gas mixture and shielded electrode structures having a getter material thereon to operate at a reduced power consumption while serving as a direct replacement for another lamp, consuming a larger amount of energy, with the same ballast transformer. The getter material improves the starting characteristics of the lamps.
    Type: Grant
    Filed: June 24, 1975
    Date of Patent: June 28, 1977
    Assignee: Duro-Test Corporation
    Inventors: Joel Shurgan, Donald P. Northrop
  • Patent number: 4032814
    Abstract: An energy saving fluorescent lamp utilizing a krypton-neon fill gas mixture and shielded electrode structures to operate at a reduced power consumption while serving as a direct replacement for another lamp, consuming a larger amount of energy, with the same ballast transformer.
    Type: Grant
    Filed: October 3, 1975
    Date of Patent: June 28, 1977
    Assignee: Duro-Test Corporation
    Inventors: Joel Shurgan, Donald P. Northrop
  • Patent number: 4024423
    Abstract: An electric discharge tube comprising wire probes located close to the electrodes for collecting electrons, and bimetallic support for each wire probe to vary in response to operative temperature, the distance of the wire probe from the electrode.
    Type: Grant
    Filed: October 6, 1975
    Date of Patent: May 17, 1977
    Assignee: North American Philips Corporation
    Inventor: Edmund R. Kern
  • Patent number: 4020385
    Abstract: A fluorescent lamp has an electroconductive tin oxide transparent film on the inner surface of the lamp envelope and a protective coating of magnesium fluoride-titania thereover.
    Type: Grant
    Filed: August 9, 1976
    Date of Patent: April 26, 1977
    Assignee: GTE Sylvania Incorporated
    Inventor: Costas C. Lagos
  • Patent number: 3967153
    Abstract: A fluorescent lamp has a transparent electrically conductive coating on the inner surface of the fluorescent lamp bulb. A transparent protective coating of finely powdered aluminum oxide is disposed on the conductive coating.
    Type: Grant
    Filed: November 25, 1974
    Date of Patent: June 29, 1976
    Assignee: GTE Sylvania Incorporated
    Inventors: Howard W. Milke, Tadius T. Sadoski
  • Patent number: 3963954
    Abstract: A fluorescent lamp has a transparent electrically conductive indium oxide coating on the inner surface of the fluorescent lamp bulb. A transparent coating of finely powdered titania is disposed on the conductive coating to improve its conductivity and a transparent protective coating of finely powdered aluminum oxide is then disposed on the titania coating.
    Type: Grant
    Filed: November 25, 1974
    Date of Patent: June 15, 1976
    Assignee: GTE Sylvania Incorporated
    Inventors: Howard W. Milke, Tadius T. Sadoski
  • Patent number: 3952264
    Abstract: Low frequency noise in a gas laser is suppressed by providing an auxiliary cathode in proximity to the anode to provide an auxiliary gas discharge between these elements. The anode and another cathode provide a primary gas discharge for lasing operation.
    Type: Grant
    Filed: May 24, 1971
    Date of Patent: April 20, 1976
    Assignee: Massachusetts Institute of Technology
    Inventor: Karl Uno Ingard
  • Patent number: 3932783
    Abstract: An indium oxide coating is used on the inside surface of a vapor electric discharge lamp, such as a fluorescent lamp, to reduce the starting voltage. The coating is especially effective at low temperatures, but also reduces the voltage even at room temperatures. It is particularly useful also in lamps using certain mixed inert gases with the mercury, since the mixtures used generally require a higher starting voltage than the ordinary fluorescent lamps containing argon and mercury vapor.
    Type: Grant
    Filed: February 14, 1972
    Date of Patent: January 13, 1976
    Assignee: Sylvania Electric Products Inc.
    Inventors: Richard A. Menelly, Tadius T. Sadoski