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:
Dec. 15, 1998
Filed:
Nov. 04, 1996
Applicant:
Inventor:
Tom Van Zutphen, Eindhoven, NL;
Assignee:
U.S. Philips Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
257 10 ; 257488 ; 257491 ; 313446 ; 313495 ;
Abstract
By providing a semiconductor device such as a cold cathode (7) with extra zener or avalanche structures (26, 27 and 32, 33, respectively) a robust structure is obtained which is resistant to damage during manufacture and use of a vacuum tube. The semiconductor zones (26, 27, 32, 33) are thus also utilized for realizing electron optics (particle optics).