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:
Jan. 05, 1982
Filed:
Nov. 23, 1979
Harald Ibach, Aachen-Verlautenheide, DE;
Abstract
The radiant heat of the graphite carrier of a LaB.sub.6 cathode is utilized o heat the input diaphragm of the monochromator of an electron spectrometer by opening up the aperture in the repeller electrode that provides magnetic shielding from the heating current and through which the emitting portion of the cathode projects, so that the entire surface of the graphite carrier can radiate heat towards the input diaphragm. The spacing of the point of the cathode from the graphite carrier may be increased in order to accord with the provision of additional heat in the carrier for radiation to the diaphragm. The radiant heat raises the temperature of the diaphragm and thereby reduces electrostatic charges resulting from bombardment of the diaphragm by electrons from the cathode, allowing a larger beam current to be monochromatized.