Patents by Inventor Charles Michael Wetzel

Charles Michael Wetzel 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).

  • Method utilizing a magnetic assembly during etching thin shadow masks
    Patent number: 6562249
    Abstract: In an improved method of etching apertures in a thin metal sheet to form a shadow mask for a color picture tube, the metal sheet has a first acid-resistant stencil on one major surface thereof and a second acid-resistant stencil on the other major surface thereof. At least one of the stencils has openings therein at locations of intended apertures. The improvement comprises the steps of magnetically holding the metal sheet with a flat magnetic assembly, and moving the magnetic assembly magnetically holding the metal sheet thereon through an etching chamber. The magnetic assembly includes a magnetic layer that is supported on an acid-resistant board.
    Type: Grant
    Filed: July 10, 2001
    Date of Patent: May 13, 2003
    Assignees: BMC Industries, Inc., Thomson Consumer Electronics
    Inventors: Craig Clay Eshleman, Charles Michael Wetzel, Randall Eugene McCoy, Leo B. Kriksunov, Lance Benjamin, Derek Harris, Thomas R. Sage
  • Method utilizing a magnetic assembly during etching thin shadow masks
    Publication number: 20020070196
    Abstract: In an improved method of etching apertures in a thin metal sheet to form a shadow mask for a color picture tube, the metal sheet has a first acid-resistant stencil on one major surface thereof and a second acid-resistant stencil on the other major surface thereof. At least one of the stencils has openings therein at locations of intended apertures. The improvement comprises the steps of magnetically holding the metal sheet with a flat magnetic assembly, and moving the magnetic assembly magnetically holding the metal sheet thereon through an etching chamber. The magnetic assembly includes a magnetic layer that is supported on an acid-resistant board.
    Type: Application
    Filed: July 10, 2001
    Publication date: June 13, 2002
    Applicant: BMC Industries, Inc. and Thomson Consumer Electronics, Inc.
    Inventors: Craig Clay Eshleman, Charles Michael Wetzel, Randall Eugene McCoy, Leo B. Kriksunov, Lance Benjamin, Derek Harris, Thomas R. Sage
  • Display apparatus having enhanced resolution shadow mask and method of making same
    Patent number: 5730887
    Abstract: In accordance with the present invention, a display apparatus 8 comprises a color CRT 10 having an evacuated envelope 11 with a faceplate panel 12 sealed to one end of a funnel 15 that is closed at the other end by a neck 14. The faceplate panel has a luminescent screen 22 on an interior surface thereof. A shadow mask 25 is located in proximity to the screen. The shadow mask comprises a metal sheet having a central portion and an exterior portion with a plurality of apertures 40, 43 therethrough. An electron gun 26 is disposed within the neck for generating and directing electron beams 28 toward the screen. A deflection yoke 30 is disposed around the envelope at the junction of the neck and the funnel. The yoke deflects the beams to scan a raster across the screen.
    Type: Grant
    Filed: April 1, 1996
    Date of Patent: March 24, 1998
    Assignee: Thomson Consumer Electronics, Inc.
    Inventors: Theodore Frederick Simpson, Istvan Gorog, Bruce George Marks, Charles Michael Wetzel, Craig Clay Eshleman