Patents by Inventor J. Chmelik

J. Chmelik 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).

  • Particle-optical apparatus comprising a fixed diaphragm for the monochromator filter
    Patent number: 5838004
    Abstract: An electron microscope comprises an energy-selective filter (10) which is arranged ahead of the high-voltage field in the electron gun (2). Because the filter carries high-voltage potential and is arranged within the gun space (14) which is filled with SF.sub.6 gas, problems arise regarding electrical and mechanical passages to the filter. Notably the centering of the filter is problematic. In order to enable suitable aperture adjustment of the filter nevertheless (for current limitation and for avoiding optical aberrations introduced into the beam by the filter), there is provided an entrance diaphragm (30) which is rigidly connected to the filter parts, notably to a pole face or to a field-defining closing piece (48a) of the filter.
    Type: Grant
    Filed: June 2, 1997
    Date of Patent: November 17, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Peter Christiaan Tiemeijer, J. Chmelik, Pieter Kruit