The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 02, 1990
Filed:
Apr. 24, 1989
Gerardus J Hellings, Eindhoven, NL;
Antonius W Van Der Heijden, Eindhoven, NL;
Erich E Himmelbauer, Eindhoven, NL;
Gerardus A Vrijssen, Eindhoven, NL;
Tjerk G Spanjer, Eindhoven, NL;
Willem M Van Alphen, Eindhoven, NL;
Jeroen Van Engelshoven, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A display tube comprising an electron gun having a beam-shaping part and a focusing structure. The focusing structure comprises an elongate hollow structure with a high-ohmic resistive layer provided on the inner and/or outer surface and comprises means for forming a non-rotationally symmetrical lens element in the area of the focusing structure. This may be a structure generating an electric multipole (for example, dipole or quadrupole) which may be incorporated particularly in the high-ohmic resistive layer.