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. 24, 2000
Filed:
Oct. 16, 1998
Applicant:
Inventors:
Jean J Heuvelmans, Eindhoven, NL;
Andreas S Geven, Eindhoven, NL;
Assignee:
U.S. Philips Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01K / ;
U.S. Cl.
CPC ...
313580 ; 313631 ;
Abstract
At least one of the electrodes (6a) has a coil (60a) of a refractory metal which is electrically connected to current supply conductors (7a, 7a') which extend to outside the discharge vessel. The coil (60a) has a central portion (61a) which is coated with an electron-emitting material and an end portion (62a, 62a) on either side thereof, which end portions are covered with a protecting material which is mainly formed by one or more oxides of calcium and/or magnesium.