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:
May. 24, 1994
Filed:
Aug. 17, 1992
Applicant:
Inventors:
Frans M Snijkers, Eindhoven, NL;
Jacobus E Crombeen, Eindhoven, NL;
Assignee:
U.S. Philips Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
445 51 ; 3133 / ;
Abstract
To maintain a monolayer of scandium, which is necessary for a satisfactory emission on the surface of a scandate cathode, at least the top layer of the cathode is provided with a scandium-containing oxidic phase from which Scandium is supplied by segregation of scandium from this oxidic phase.