Patents by Inventor Robert L. Bergamo

Robert L. Bergamo 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).

  • Positive-working photoresist composition and method for forming a light-absorbing matrix in a color CRT structure
    Patent number: 4590138
    Abstract: A positive-working photoresist composition is described comprising a solution of polyvinyl alcohol, an inorganic ferric salt, ammonium trioxalatoferrate and a diol such as 1,4-butanediol. There is also described the addition of a finely divided black pigment to such a composition and the use of such a black pigmented composition for the formation of a light-absorbing matrix in a color CRT screen structure.
    Type: Grant
    Filed: May 1, 1985
    Date of Patent: May 20, 1986
    Assignee: North American Philips Consumer Electronic Corp.
    Inventors: Robert L. Lambert, Judy A. Nagel, Robert L. Bergamo
  • Positive-working photoresist composition and method for forming a light-absorbing matrix
    Patent number: 4546064
    Abstract: A positive-working photoresist composition is described comprising a solution of polyvinyl alcohol, an inorganic ferric salt, ammonium trioxalatoferrate and a diol such as 1,4-butanediol. There is also described the addition of a finely divided black pigment to such a composition and the use of such a black pigmented composition for the formation of a light-absorbing matrix in a color CRT screen structure.
    Type: Grant
    Filed: November 4, 1983
    Date of Patent: October 8, 1985
    Assignee: North American Philips Corporation
    Inventors: Robert L. Lambert, Judy A. Nagel, Robert L. Bergamo
  • Photographic process for applying phosphor pattern to color CRT shadow mask
    Patent number: 4505999
    Abstract: Phosphor characters to supply feedback information for an automatic convergence system are applied to the gun side of the shadow mask of a color cathode ray tube by a method of applying layers of a positive-working photoresist and phosphor, exposing the layers through a positive photomask, back exposing to clear the shadow mask apertures, developing to remove the exposed areas, and baking to remove the photoresist.
    Type: Grant
    Filed: September 12, 1983
    Date of Patent: March 19, 1985
    Assignee: North American Philips Consumer Electronics Corp.
    Inventors: Robert L. Bergamo, Gordon T. Foreman, Anthony V. Gallaro, Judy A. Nagel
  • Method for reducing pattern stripes in slotted mask screens for cathode ray tubes
    Patent number: 4245019
    Abstract: A method for forming patterned screens for cathode ray tubes wherein a multiplicity of viewing areas are spaced in accordance with and dimensionally smaller than openings of a mask member comprising the steps of coating the inner surface of a viewing panel with polyvinyl alcohol photosensitized with dichromate; exposing the viewing panel at a first positional location to radiant energy beamed through the mask openings; moving the viewing panel to a second positional location and exposing the viewing panel to radiant energy beamed through the mask openings; developing to remove the unexposed coating from the viewing panel; treating the exposed viewing panel with a dilute organic etching composition to erode the coating exposed to the radiant energy at one of the first and second positional locations; and washing the viewing panel to remove the etching composition and eroded coating leaving polymerized coating of a dimension smaller than the openings of the mask member.
    Type: Grant
    Filed: July 31, 1978
    Date of Patent: January 13, 1981
    Assignee: GTE Products Corporation
    Inventors: Robert L. Bergamo, Thaddeus V. Rychlewski, Siegbert M. Wirth