Patents by Inventor Johannes M. A. Van Esdonk

Johannes M. A. Van Esdonk 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 of manufacturing a display window for a display device
    Patent number: 5240748
    Abstract: To reduce reflection at a surface of a cathode ray tube display window, the surface is provided with a pattern of irregularities formed by ultraviolet laser radiation. Preferably the inside surface of the display window of the cathode ray tube is treated with the pattern of irregularities followed by a phosphor pattern over the treated surface. In one embodiment, a transmission grating is used to pass ultraviolet radiation to form the irregularities.
    Type: Grant
    Filed: December 13, 1991
    Date of Patent: August 31, 1993
    Assignee: U.S. Philips Corporation
    Inventors: Johannes M. A. Van Esdonk, Marcel Niestadt
  • Method of manufacturing optical fibres having a core and a cladding of glass applying the rod-in-tube technique
    Patent number: 4854956
    Abstract: The invention relates to a method of manufacturing optical fibres in which a quartz glass tube is coated on the inside with core material, the assembly is contracted to form a solid rod which is then inserted into a quartz glass tube, after which the assembly is drawn. The last tube is thermally treated to eliminate contaminations at the surface which may detrimentally influence the tensile strength of the ultimate fibre.
    Type: Grant
    Filed: October 6, 1988
    Date of Patent: August 8, 1989
    Assignee: U.S. Philips Corp.
    Inventors: Rene A. M. Pluijms, Emmanuel Papanikolau, Leendert B. Jongeling, Johannes M. A. Van Esdonk