Patents by Inventor Johannes H. Bohlander

Johannes H. Bohlander 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).

  • Color cathode ray tube comprising an in-line electron gun with extended outer apertures
    Patent number: 5834887
    Abstract: An in-line electron gun includes main lens electrodes, a common aperture and, at a distance from the common aperture, three in-line apertures in a plate-shaped part. The outer apertures extend, viewed in a direction transverse to the plate-shaped part, beyond the common aperture.
    Type: Grant
    Filed: January 30, 1996
    Date of Patent: November 10, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Tjerk G. Spanjer, Lambert J. Stil, Johannes H. Bohlander, Abraham A. Los, Antonius J Pennings
  • Color cathode ray tube having an in-line electron gun with asymmetrical apertures
    Patent number: 5818157
    Abstract: A color cathode ray tube includes an in-line electron gun having a main lens with recessed apertures. The main lens is formed by two electrodes. These electrodes have outer edges and recessed apertures which allow passage of three in-line electron beams and which are arranged at a distance d1 and d2, respectively, from the outer edges. The outermost apertures are asymmetric. The difference d1-d2 and the asymmetry of the outermost apertures is such that both the beam displacement and the core haze asymmetry are minimal.
    Type: Grant
    Filed: June 5, 1997
    Date of Patent: October 6, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Lambert J. Stil, Johannes H. Bohlander, Tjerk G. Spanjer, Abraham A. Los, Antonius J. Pennings
  • Color display tube comprising an in-line electron gun with astigmatism tuning element
    Patent number: 5710479
    Abstract: A colour display tube has an in-line electron gun for generating three co-planar electron beams first and second lens electrode produce a focusing lens field for focusing the electron beams. At least one of the lens electrodes has a correction element for tuning the astigmatism of the lens field. The correction element includes three co-linear apertures for passing the electron beams, the outer apertures of which are funnel-shaped, the wide end of the funnel-shape being directed away from the center aperture.
    Type: Grant
    Filed: January 2, 1996
    Date of Patent: January 20, 1998
    Assignee: U.S. Phillips Corporation
    Inventors: Jan P. Adriaanse, Johannes H. Bohlander, Willibrordus A.J.A. Van Der Poel
  • Cathode ray tube comprising an electron gun having a plane-parallel optical system
    Patent number: 5291095
    Abstract: A cathode ray tube comprising an electron gun having two oppositely arranged conductor patterns. In operation, the electron beams (or electron beam) move between the conductor patterns. It has been found that the electron-optical functions, such as focusing and converging the electron beams, which are fulfilled by electrodes in a conventional gun can be fulfilled by two flat-conductor patterns. Said conductor patterns can be accurately manufactured and arranged relative to each other. This enables the manufacture of complicated lens systems.
    Type: Grant
    Filed: February 20, 1992
    Date of Patent: March 1, 1994
    Assignee: U.S. Philips Corporation
    Inventor: Johannes H. Bohlander